TM

2019 Iron Powder Products Catalog

About Micrometals

For over 65 years, Micrometals Inc. has been an engineering driven company striving to exceed  
customer requirements for magnetic components.  Micrometals customized formulations of  
powdered metals, and their expertise at forming these materials into complex in shapes for power 
applications, is trusted by the most respected names in power electronics. Micrometals is a privately 
held corporation which is headquartered in Anaheim, California.  In addition to the U.S.  
headquarters, Micrometals has global manufacturing sites in China and global distribution  
partners. Micrometals offers application engineering and technical support from North America  
and China, as well as stocking warehouses located in the U.S., Europe and Hong Kong.

Performance to the CORE!

Your power products deserve the performance you designed into them. For more than 65 years  
Micrometals has been trusted to deliver the most reliable core products in the world.  

For many customers there is simply no equivalent.

Our experienced team can help you at any phase of your project

Product Design to Prototype to Production

Our on-line Inductor Design Software can quickly provide you with readily available options for 
your application and our Inductor Analyzer can take that design and allow you to modify design 
parameters to optimize the solution.  Our industry leading design tools, technical support and 
manufacturing capabilities can help you quickly move from design to production, with a solution that 
can be trusted to deliver consistent performance for decades!

Catalog Samples to Custom Prototypes

Contact Micrometals today to discuss your application and we’d be glad to provide catalog core 
samples for you to quickly test in your application. If you need wound components we can connect 
you with one of our preferred winding suppliers to assure you get high quality components quickly.

Need something a little more custom?  Micrometals has extensive customization capabilities and 
decades of experience to help you develop design options and to find the right solution for every 
phase of your project.

Custom core shapes and assemblies

Many engineers know of our extensive catalog offering a wide variety of available shapes and sizes 
but we also provide custom core shapes and assemblies for engineers around the world.  Our 
custom capabilities are unmatched and can help you optimize your design and deliver a very unique 
solution for your application, which would exceed anything commercially available.

Custom materials formulations

Micrometals has extensive experience in developing unique materials formulations for demanding 
applications.  Whether your objective is performance, cost, efficiency, weight, Micrometals can  
develop a solution to meet all of your project requirements.  
 

Prototype samples and testing

Have a new shape, concept or idea for a new core?  Contact Micrometals today to discuss how we 
can help turn your idea into a reality, and even get you prototypes quickly.  Our engineers will help 
guide your design idea into a solution that is optimized, manufacturable and economical for your 
application.  We can even provide electrical testing of designs to determine if the performance 
meets requirements or analyze where additional design optimization could yield a better solution.

www.micrometals.com

1

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Table of Contents

Iron Powder Core Solutions ........................................................................................... 2
Design Software ............................................................................................................ 4
Material Groups ............................................................................................................ 5

 

Power Conversion ....................................................................................................................... 5

 

Radio Frequency .......................................................................................................................... 8

 

High Temperature 200C............................................................................................................. 10

Micrometals Iron Powder Performance Data ............................................................... 12
Curve fit coefficients Table ........................................................................................... 40
Common Core Shapes .................................................................................................. 43

 

Toroid ........................................................................................................................................ 43

 E-core ........................................................................................................................................ 57
 

Bus Bar ...................................................................................................................................... 61

 Balun ......................................................................................................................................... 62
 

Plain Core .................................................................................................................................. 63

Micrometals Alloy Powder Core Solutions ................................................................... 66
Micrometals Quality Certifications .............................................................................. 68

TEL (714) 970-9400  |  FAX (714) 970-0400

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Micrometals Iron Powder Core Shapes  

Catalog and Custom

The parts presented in this catalog represent just a portion of the core shapes available from 

Micrometals. Our full catalog offering can be found on line at 

www.micrometals.com

 and includes the 

shapes below.

Our catalog offering is just the beginning, Micrometals has extensive experience and expertise at 

designing, prototyping and manufacturing and wide variety of custom shapes to optimize your 

design and help you create a competitive advantage in your products.

Balun Core

E Core

IC Core

Rectangular Toroid

Block Core

EH Core

I Core

SC Core

Bus Bar

U Core

ID Core

Sleeve Core

Composite

EM Core

Plain Core

Square Bobbins

Cup Core

HC Core

Plastic Bobbins

Threaded Core

Disc Core-PC

HD Core

Pot Core

Toroid

Disc Core-RF

Hollow Core

RC Core

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3

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Custom capabilities and prototypes  

in as little as 2 weeks! 

Our engineers can save you development time and money by helping you move quickly through feasibility, design 

and test phases and deliver prototypes quickly, which can then be moved into production. No other powder core 

supplier has the design, manufacturing and prototyping experience for custom cores – so start with Micrometals!

Machined catalog cores

 

•

  Reduce or remove dimensional features  

(grinding, turning, milling and polishing)

 

•

  Combine/stack/nest cores

Machine new core shapes from powder core blocks 

  

 

•

  Catalog variants

 

•

  New shapes

 

•

  New Shape / Material combinations

 

•

  Machined cores and mounting plates

Wound components

 

We can work directly with your winding provider or  

 

connect you with one of our winding partners near you

Special coatings

 

•

  Harsh environment coatings

 

•

  Ruggedized designs

 

•

  Medical Grade coatings

 

•

  Tighter tolerance on coating thickness

 

•

  Special masking

Micrometals Powder Core Materials – No Equivalent

Micrometals expertise and experience in creating custom core shapes and 

material formulations is unmatched.  We have helped thousands of engineers 

solve their most difficult power design challenges and delivered prototype and 

production units with uncompromising quality.  With more than 65 years of experience we can quickly assess your 

design challenges and help optimize your design to meet budgetary and performance requirements.  

Our catalog offering of powder core materials are the highest quality in the industry and many of our formulations 

are the “Gold Standard” and are specified explicitly on thousands of design drawings around the world.  For 

customers who require reliable performance and quality they simply state on their designs –  

“Micrometals Only – no equivalent”.

Our decades of material formulation experience enables Micrometals to develop unique Iron and Alloy powders to 

address demanding applications where other materials fall short.  We can develop new formulations to optimize 

magnetic attributes, compensate for electrical design issues such as noise or interference, or improve electrical 

efficiency.
Our experience in custom material formulations include solutions for some of the electrical challenges below.

 

•

  Minimize power supply acoustic or electrical noise

 

•

  Optimize efficiency for specific application conditions

 

•

  Lowest core loss

 

•

  High frequency

 

•

  High power

 

•

  Optimized cost/performance

 

•

  Custom permeability

 

•

  Custom formulation and sorting to deliver tighter tolerance magnetic properties

TEL (714) 970-9400  |  FAX (714) 970-0400

4

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Inductor Design Software

Best in Class Design Software – Free on-Line

Micrometals offers several helpful and powerful digital design tools; Micrometals Inductor Design Software, 

Inductor Analyzer, and PowerEsim Magnetic Builder. Micrometals Inductor Design Software is a flexible user-friendly 

engineering tool that is intended to assist in the selection of powder cores. Our Inductor Analyzer allows engineers to 

quickly modify core winding and design parameters using our standard products to determine the optimal design for 

their system. PowerEsim is an on-line design resource for designing power supply circuits which includes a magnetic 

component design features.

The Micrometals Inductor Design Calculator allows users to log in and select from two different inductor applications:

•

  Design of DC inductors used in DC/DC converters

•

  Design of a Power Factor Boost Inductor, commonly referred to as a PFC choke.

Using the DC and PFC topology choices, the software can be used for:

•

  Class D output inductor - using PFC

•

  Differential Mode Filter - using PFC or DC/DC

•

  Inverter Filter - using PFC

•

  Resonant Converters - using DC/DC

The calculator accepts the following user defined design requirements as inputs:

Inductor Current

Required Inductance at full Inductor Current

Switching Frequency of the Converter

Inductor Voltages during the “ON” and “OFF” times of the switch (for ripple current calculation of DC Inductors)

RMS Input and DC Output Voltages (for ripple current calculation of PFC Boost Inductors)

Core Geometry (Toroid or ECore)

Core Stacking

Preferred Toroid Winding technique (Fully Wound or Single Layer)

Ambient Conditions

This program will automatically calculate and display:

Part Number

Approximate unit price

Required Number of Turns

Wire Size

Winding Resistance, including Temperature and Skin Depth Effects

Bpk - Peak AC Flux Density

Inductance at Zero Current and Full Current

Core Loss

Copper Loss

Temperature Rise

Core Dimensions, both bare core and wound core

www.micrometals.com

5

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Material

Mix No.                

Reference

Permeability

Typical AL

 Tolerance 

(%)

Powder

 Type

Temp Coef 

of Perm 

(+ppm/C°)

Density

gm/cm

3

Max

Frequency 

(MHz)

Relative

Cost*

Color Code

Toroid

Product Group

RF

PC

200C

-2

10

±

5

Carbonyl Iron

95

5.0

45

2.2

Red/Clear

3

3

-8

35

±

10

Carbonyl Iron

255

6.5

5.0

3.1

Yellow/Red

3

3

-14

14

±

10

Carbonyl Iron

150

5.2

20

2.8

Black/Red

3

-18

55

±

10

Iron

385

6.6

1.3

2.7

Green/Red

3

-19

55

±

10

Iron

650

6.8

1.0

1.2

Red/Green

3

-26

75

±

10

Iron

825

7.0

0.38

1.0

Yellow/White

3

-30

22

±

10

Iron

510

6.0

1.8

1.1

Green/Gray

3

-34

33

±

10

Iron

565

6.2

1.4

1.3

Gray/Blue

3

-35

33

±

10

Iron

665

6.3

1.1

1.1

Yellow/Gray

3

-38

85

±

10

Iron

956

7.1

0.27

1.1

Gray/Black

3

-40

60

±

10

Iron

950

6.9

0.38

1.0

Green/Yellow

3

-45

100

±

10

Iron

1043

7.2

0.34

2.6

Black/Black

3

-52

75

±

10

Iron

650

7.0

0.59

1.1

Green/Blue

3

Material

Mix  No.               

Bsat

(G)

H(Oe)

at 80% µi

%µi

 at H=50(Oe)

µ effective

 at H=50(Oe)

Core Loss (mW/cm

3

)

60Hz/5000 G

10kHz/500 G 100kHz/14O G

1MHz/40 G

10MHz/15 G

-2

14,800 

673

99

10

19

32

18

9

27

-8

17,600 

101

92

32

45

59

32

22

123

-14

15,200 

406

99

14

19

32

18

11

49

-18

17,800 

45

77

42

48

70

46

70

715

-19

18,200 

48

79

43

31

72

54

99

1138

-26

18,500 

25

55

41

32

75

83

327

4294

-30

16,700 

120

93

20

37

120

129

248

2537

-34

17,100 

78

89

29

29

87

82

157

1756

-35

17,300 

76

88

29

33

109

119

241

2531

-38

18,700 

23

51

44

31

72

103

532

7216

-40

18,400 

33

67

40

29

93

127

530

6999

-45

18,900 

18

43

43

26

60

61

212

2716

-52

18,500 

30

62

46

30

68

58

134

1571

Materials Group

Power Conversion

General Material Properties

Material Magnetic Characteristics

*Relative cost as compared to Micrometals -26 or -40 materials for a 25mm toroid.

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Material Information

-2 & -14 Materials:

 The low permeability of these 

materials will result in lower operating AC flux den-
sity than other materials with no additional gap-loss. 
The -14 Material is similar to -2 Material with a higher 
permeability.

-8 Material:

 This material has low core loss and good 

linearity under high bias conditions. A good high 
frequency material, also the highest cost iron powder 
material.

-18 Material: 

This material has low core loss similar 

to the -8 Material with higher permeability and a low-
er cost. Good DC saturation characteristics.

-19 Material:

 An inexpensive alternate to the -18 

Material with the same permeability and somewhat 
higher core losses.

-26 Material:

 A very popular material, it is a cost- 

effective general purpose material that is useful in 
a wide variety of power conversion and line filter 
applications.

-30 Material:

 The good linearity, low cost and rela-

tively low permeability of this material make a popu-
lar choice for high power UPS applications.

-34, -35 Materials:

 An inexpensive alternate to the 

-8 Material where high frequency core loss is not 
critical. Both -34 & -35 Materials have good linearity 
with high bias.

-38 Material:

 Similar to the -26 Material with higher 

permeability.

-40 Material:

 The least expensive iron powder  

material, characteristics similar to the -26 Material 
with a lower permeability. Most popular is large sizes.

-45 Material:

 The highest permeability iron powder 

material available. Consider as a high perm alternate 
to the -52 Material with slightly higher core losses.

-52 Material:

 This material has lower core losses at 

high frequency and the same permeability as the -26 
Material. It is popular for high frequency choke de-
signs and available in a wide variety of geometries.

Initial Permeability (µi) vs. DC Magnetizing Force

Percent Initial Permeability (%µi) vs. DC Magnetizing Force

www.micrometals.com

7

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Percent Initial Permeability (%µi) vs. Peak AC Flux Frequency

BH Curves

Initial Permeability (µi) vs Frequency (Hz)

Material Frequency Range

TEL (714) 970-9400  |  FAX (714) 970-0400

8

TM

Material

Mix No.                

Reference

Permeability

Typical AL

 Tolerance 

(%)

Powder

 Type

Temp Coef 

of Perm 

(+ppm/C°)

Density

gm/cm

3

Max

Frequency 

(MHz)

Relative

Cost*

Color Code

Toroid

Product Group

RF

PC

200C

-0

1

N/A

Phenolic

N/A

N/A

N/A

1.3

Tan/Tan

3

-1

20

±

10

Carbonyl Iron

280

6.4

10

3.8

Blue/Clear

3

-2

10

±

5

Carbonyl Iron

95

5.0

45

2.2

Red/Clear

3

3

-3

35

±

10

Carbonyl Iron

255

6.5

5.0

3.3

Gray/Clear

3

-4

9

±

5

Carbonyl Iron

280

5.0

17

2.2

Blue/White

3

-6

8.5

±

5

Carbonyl Iron

35

5.0

55

3.6

Yellow/Clear

3

-7

9

±

5

Carbonyl Iron

30

5.0

50

3.0

White/Clear

3

-8

35

±

10

Carbonyl Iron

255

6.5

5.0

3.1

Yellow/Red

3

3

-10

6

±

5

Carbonyl Iron

150

4.9

83

5.5

Black/Clear

3

-15

25

±

10

Carbonyl Iron

190

6.4

7.0

3.4

Red/White

3

-17

4

±

5

Carbonyl Iron

50

4.8

170

3.5

Blue/Yellow

3

Radio Frequency

General Material Properties

-2, -4, -6 & -7 Materials:

 These are the most popular 

carbonyl iron mixes. They will provide High Q up to 
40 MHz and the most popular for amateur radio and 
variety of other communication applications. They 
are also useful for moderate band transformers in the 
200 to 400 MHz frequency range

-1, -3, -8 & -15 Materials:

These materials are  

annealed carbonyl irons providing the highest car-
bonyl permeability. They are useful for high Q appli-
cations below 1 MHz and will provide the broadest 
band transformers covering a typical range from  
50 to 500 MHz.

-10 & -17 Materials: 

These materials are the highest 

frequency carbonyl irons. They will provide high Q 
up to 150 MHz and are a popular material for cable 
television applications. They will produce moderate 
band transformers covering 400 to 700 MHz.

-0 Material:

 This is a non-magnetic material. It pro-

vides a solid winding form for winding air coils. It has 
excellent temperature stability and will provide high 
Q up to the highest frequencies. It is also useful for 
moderate band transformer applications covering a 
typical range from 600 MHz to 1 GHz.

Material Information

*Relative cost as compared to Micrometals -26 or -40 materials for a 25mm toroid.

www.micrometals.com

9

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Initial Permeability (µi) vs. DC Magnetizing Force

Percent Initial Permeability (%µi) vs. DC Magnetizing Force

Percent Initial Permeability (%µi) vs. Peak AC Flux Density

Initial Permeability (µi) vs Frequency (Hz)

BH Curves

Material Frequency Range

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Material

Mix No.                

Reference

Permeability

Typical AL

 Tolerance 

(%)

Powder

 Type

Temp Coef of

Perm 

(+ppm/C°)

Density

gm/cm

3

Max

Frequency 

(MHz)

Relative

Cost*

Color Code

Toroid

Product Group

RF

PC

200C

-60

55

±

10

Silicon-Iron

168

6.1

1.3

2.0

Brown/Black

3

-61

38

±

10

Silicon-Iron

-418

6.1

2.0

2.0

Brown/Gray

3

-63

35

±

10

Silicon-Iron

-313

5.9

5.8

3.0

Brown/Beige

3

-65

42

±

10

Silicon-Iron

-80

6.1

2.0

2.0

Brown/Yellow

3

-66

66

±

10

Silicon-Iron

-220

6.2

1.5

2.5

Brown/Brown

3

-70

100

±

10

Nickel-Iron

216

7.4

0.66

9.9

Beige/Black

3

-M125

125

±

10

Molyper-

malloy

150

7.7

0.48

12

Lt.Blue/Lt.Blue

3

Material

Mix  No.               

Bsat

(G)

H(Oe)

at 80% µi

%µi

 at H=50(Oe)

µ effective

 at H=50(Oe)

Core Loss (mW/cm

3

)

60Hz/5000 G

10kHz/500 G 100kHz/14O G

1MHz/40 G

10MHz/15 G

-60

14,400 

35

71

39

43

76

52

68

630

-61

14,400 

65

85

32

80

113

69

72

569

-63

14,100 

69

86

30

74

60

31

20

88

-65

16,000 

55

82

35

54

77

33

48

567

-66

16,200 

36

71

47

48

48

17

31

392

-70

8,600 

20

47

47

6

10

13

69

947

-M125

8,800 

24

44

55

5

6

13

86

1193

High Temperature

General Material Properties

Material Magnetic Characteristics

-60 Material:

 The 60 Series of materials are cost 

effective magnetic powder alloy materials that 
are not subject to thermal aging for operating 
temperatures up to 200°C. The -60 Material has 55 
permeability and can be considered as a substitute 
for -18 Material.

-61 Material, -63 Materials: 

Both materials have 

initial permeability of 35. The -63 Material has 
excellent high frequency properties and be and can 
operate past 10MHz. -63 Material can be considered 
for high temperature alternate to -8 Material. Both 
materials are not subject to thermal aging concerns.

-65 Material:

 This material has a permeability of 

42 and is most popular in Microcube geometries.  
The -65 has higher core losses at high frequencies 
compared to -66 Material but better DC saturation. 
No thermal aging concerns.

-66 Material: 

This material offers low core losses and 

is well suited from 100kHz to 500kHz. No thermal 
aging concerns.

-70 Material:

 This is a magnetic powder alloy 

including nickel. The -70 Material has higher 
permeability than the 60 Series with excellent losses 
up to 400kHz. This is a relatively expensive material, 
most competitively priced in smaller sizes. No 
thermal aging concerns.

-M125 Material: 

This is a molypermally powder 

material and will have the highest permeability 
and lowest losses below 200kHz. Similar to the -70 
Material is cost, the -M125 Material will be most 
competitively priced in smaller sizes.

Material Information

*Relative cost as compared to Micrometals -26 or -40 materials for a 25mm toroid.

www.micrometals.com

11

TM

Initial Permeability (µi) vs. DC Magnetizing Force

Percent Initial Permeability (%µi) vs. Peak AC Flux Density

BH Curves

Percent Initial Permeability (%µi) vs. DC Magnetizing Force

Initial Permeability (µi) vs Frequency (Hz)

Material Frequency Range

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12

TM

Revision 20160429 - Generated 2016-May-02

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=1.90E+09,   b=2.00E+08,  c=9.00E+05,   d=4.30E-15

a=1.00E-02,  b=1.14E-06,  c=1.43,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=3.50E+02, b=3.78E-01, c=1.03E+00, d=1.76E+10, e=-1.98E+00, f=1.40E+02

a=2.19E-01,   b=1.98E-07,  c=6.64E-01,   d=1.54E+01

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=2.69E-02,  b=1.75E+00,  c=4.65E+01,  d=5.67E-01,  e=8.73E+02

a=280

36 mW/cm³ (max)

82.2% (nom)

78.0% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

6.4 g/cm³

Density

-1

Mix:

Core Loss (mW/cm³)

=

μi(reference)

20

Color Code

Blue/Clear

Bsat

17.5kG

31 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-1  20µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

1

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-1  20µ

10 MHz
5 MHz
2 MHz
1 MHz
500 kHz
200 kHz
100 kHz
50 kHz
10 kHz
1 kHz

100

105

110

115

120

125

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-1  20µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

5

10

15

20

25

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-1  20µ

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

0

100

200

300

400

500

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-1  20µ

-3

-2

-1

0

1

2

3

4

5

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

ha

ng

e

 i

n P

e

rm

e

a

bi

li

ty

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-1  20µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-1 material 

is an annealed carbonyl iron providing the 

highest carbonyl permeability.  -1 is useful for high Q 
applications below 1 MHz and will provide the broadest band 
transformers covering a typical range from 50 to 500 MHz.

Materials Performance Data

www.micrometals.com

13

TM

Revision 20160422 - Generated 2016-Apr-26

where B

pk

 expressed in gauss, f  expressed in hertz, and:

where H  expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=9.60E-16

a=1.00E-02,  b=1.83E-07,  c=1.46,  d=0.00

where B

pk

 expressed in gauss, and:

where f  expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=1.11E-01,   b=7.01E-11,  c=9.00E-01,   d=1.00E+00

where B

pk

 expressed in gauss, H  in oested, and:

where T  expressed in celsius, and:

a=1.50E-03,  b=1.96E+00,  c=1.97E+04,  d=9.18E-04,  e=1.48E+03

a=95

20 mW/cm³ (max)

95.9% (nom)

94.8% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

5.0 g/cm³

Density

-2

Mix:

Core Loss (mW/cm³)  =

μi(reference)

10

Color Code

Red/Clear

Bsat

14.8kG

18 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 In

itial 

Pe

rm

eab

ilit

y 

(%

µ

i

)

H - DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-2  10µ

Nominal

H = DC Magnetizing Force (Oe)

N = Number of Turns

I = DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

Co

re L

oss 

(mW

/c

m³

)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-2  10µ

500 kHz

250 kHz

100 kHz

50 kHz

25 kHz

10 kHz

5 kHz

1 kHz

400 Hz

60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 In

itial 

Pe

rm

eab

ilit

y 

(%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-2  10µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N = Number of Turns

0

2

4

6

8

10

12

10,000

100,000

1,000,000

10,000,000

100,000,000

In

itial 

Pe

rm

eab

ilit

y 

(µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-2  10µ

0

1000

2000

3000

4000

5000

6000

7000

0

100

200

300

400

500

600

700

B

pk

-P

ea

k A

C 

Fl

ux 

Den

si

ty 

(G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-2  10µ

-1

-0.5

0

0.5

1

1.5

-60 -40 -20

0

20

40

60

80 100 120 140 160

%C

ha

ng

e 

in

 P

er

mea

bi

lit

y

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-2  10µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-2 material

 is a popular carbonyl iron mix that provides 

High Q up to 40 MHz and is very popular for amateur radio 
and a variety of other communication applications. -2 is 
also useful for moderate band transformers in the 200 
to 400 MHz frequency range. The low permeability of -2 
material will result in lower operating AC flux density than 
other materials with no additional gap-loss.   For a slightly 
higher permeability consider -14 material.

TEL (714) 970-9400  |  FAX (714) 970-0400

14

TM

Revision 20170809 - Generated 2017-Aug-18

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=1.90E+09,   b=2.00E+08,  c=9.00E+05,   d=4.30E-15

a=1.00E-02,  b=3.49E-06,  c=1.43,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=3.50E+02, b=3.78E-01, c=1.03E+00, d=1.76E+10, e=-1.98E+00, f=1.40E+02

a=1.27E-01,   b=1.98E-07,  c=6.64E-01,   d=2.70E+01

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=4.11E-02,  b=1.75E+00,  c=3.64E+01,  d=5.64E-01,  e=5.04E+02

a=255

6.5 g/cm³

Density

-3

Mix:

Core Loss (mW/cm³)

=

μi(reference)

35

Color Code

Gray/Clear

Bsat

17.6kG

31 mW/cm³ (nom)

36 mW/cm³ (max)

60.1% (nom)

53.7% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-3  35µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-3  35µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

105

110

115

120

125

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-3  35µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

5

10

15

20

25

30

35

40

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-3  35µ

0

2000

4000

6000

8000

10000

12000

14000

0

200

400

600

800

1,000

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-3  35µ

-3

-2

-1

0

1

2

3

4

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

h

a

n

ge

 in

 P

e

rm

e

a

b

ilit

y

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-3  35µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-3 material 

is an annealed carbonyl iron providing the 

highest carbonyl permeability.  -3 is useful for high Q 
applications below 1 MHz and will provide the broadest 
band transformers covering a typical range from 50 to 500 
MHz.

www.micrometals.com

15

TM

Revision 20171027 - Generated 2017-Nov-08

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=8.00E-15

a=1.00E-02,  b=1.83E-07,  c=1.46,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=1.25E-01,   b=7.01E-11,  c=9.00E-01,   d=1.00E+00

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=1.35E-03,  b=1.96E+00,  c=2.19E+04,  d=9.18E-04,  e=1.65E+03

a=280

22 mW/cm³ (max)

95.9% (nom)

94.8% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

5.0 g/cm³

Density

-4

Mix:

Core Loss (mW/cm³)

=

μi(reference)

9

Color Code

Blue/White

Bsat

14.8kG

19 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-4  9µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-4  9µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-4  9µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

1

2

3

4

5

6

7

8

9

10

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-4  9µ

0

2000

4000

6000

8000

10000

12000

14000

0

1,000

2,000

3,000

4,000

5,000

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-4  9µ

-3

-2

-1

0

1

2

3

4

5

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

h

a

n

ge

 in

 P

e

rm

e

a

b

ilit

y

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-4  9µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-4 material 

is a popular carbonyl iron mix that provides 

High Q up to 40 MHz and is very popular for amateur  
radio and a variety of other communication applications. 
-4 is also useful for moderate band transformers in the 
200 to 400 MHz frequency range.

TEL (714) 970-9400  |  FAX (714) 970-0400

16

TM

Revision 20160216 - Generated 2016-Feb-25

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=8.90E-16

a=1.00E-02,  b=4.87E-08,  c=1.57,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=1.33E-01,   b=7.01E-11,  c=9.00E-01,   d=1.00E+00

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=1.28E-03,  b=1.96E+00,  c=2.30E+04,  d=9.19E-04,  e=1.74E+03

a=35

5.0 g/cm³

Density

-6

Mix:

Core Loss (mW/cm³)

=

μi(reference)

8.5

Color Code

Yellow/Clear

Bsat

14.8kG

18 mW/cm³ (nom)

20 mW/cm³ (max)

98.1% (nom)

97.4% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-6  8.5µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-6  8.5µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-6  8.5µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

1

2

3

4

5

6

7

8

9

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-6  8.5µ

0

1000

2000

3000

4000

5000

6000

7000

0

200

400

600

800

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-6  8.5µ

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0.6

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

ha

ng

e

 i

n P

e

rm

e

a

bi

li

ty

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-6  8.5µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-6 material 

is a popular carbonyl iron mix that provides 

High Q up to 40 MHz and is very popular for amateur  
radio and a variety of other communication applications. 
-6 is also useful for moderate band transformers in the 
200 to 400 MHz frequency range.

www.micrometals.com

17

TM

Revision 20160906 - Generated 2016-Sep-13

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=9.60E-16

a=1.00E-02,  b=1.48E-07,  c=1.46,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=1.25E-01,   b=7.01E-11,  c=9.00E-01,   d=1.00E+00

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=1.35E-03,  b=1.96E+00,  c=2.19E+04,  d=9.18E-04,  e=1.65E+03

a=30

20 mW/cm³ (max)

96.7% (nom)

95.7% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

5.0 g/cm³

Density

-7

Mix:

Core Loss (mW/cm³)

=

μi(reference)

9

Color Code

White/Clear

Bsat

14.8kG

18 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-7  9µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-7  9µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-7  9µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

1

2

3

4

5

6

7

8

9

10

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-7  9µ

0

1000

2000

3000

4000

5000

6000

7000

0

200

400

600

800

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-7  9µ

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

h

a

n

ge

 in

 P

e

rm

e

a

b

ilit

y

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-7  9µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-7 material 

is a popular carbonyl iron mix that provides 

High Q up to 40 MHz and is very popular for amateur  
radio and a variety of other communication applications. 
-7 is also useful for moderate band transformers in the 
200 to 400 MHz frequency range.

TEL (714) 970-9400  |  FAX (714) 970-0400

18

TM

Revision 20160429 - Generated 2016-May-24

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=1.90E+09,   b=2.00E+08,  c=9.00E+05,   d=5.00E-15

a=1.00E-02,  b=3.49E-06,  c=1.43,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=3.50E+02, b=3.78E-01, c=1.03E+00, d=1.76E+10, e=-1.98E+00, f=1.40E+02

a=1.27E-01,   b=1.98E-07,  c=6.64E-01,   d=2.70E+01

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=4.36E-02,  b=1.74E+00,  c=3.26E+01,  d=5.86E-01,  e=5.04E+02

a=255

36 mW/cm³ (max)

60.1% (nom)

53.7% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

6.5 g/cm³

Density

-8

Mix:

Core Loss (mW/cm³)

=

μi(reference)

35

Color Code

Yellow/Red

Bsat

17.6kG

32 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-8  35µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-8  35µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

105

110

115

120

125

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-8  35µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

5

10

15

20

25

30

35

40

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-8  35µ

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

0

50

100

150

200

250

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-8  35µ

-3

-2

-1

0

1

2

3

4

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

ha

ng

e

 i

n P

e

rm

e

a

bi

li

ty

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-8  35µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-8 material 

is an annealed carbonyl iron providing  

the highest carbonyl permeability.  -8 is useful for high  
Q applications below 1 MHz and will provide the broadest 
band transformers covering a typical range from 50 to 500 MHz.
This material has low core loss and good linearity under high 
bias conditions. A good high frequency material but also the 
highest cost iron powder material.

www.micrometals.com

19

TM

Revision 20161006 - Generated 2016-Oct-10

where B

pk

 expressed in gauss, f  expressed in hertz, and:

where H  expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=8.00E-16

a=1.00E-02,  b=5.54E-09,  c=1.69,  d=0.00

where B

pk

 expressed in gauss, and:

where f  expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=2.00E-01,   b=7.01E-11,  c=9.00E-01,   d=1.00E+00

where B

pk

 expressed in gauss, H  in oested, and:

where T  expressed in celsius, and:

a=9.13E-04,  b=1.96E+00,  c=3.83E+04,  d=9.23E-04,  e=2.43E+03

a=150

4.9 g/cm³

Density

-10

Mix:

Core Loss (mW/cm³)  =

μi(reference)

6

Color Code

Black/Clear

Bsat

14.6kG

18 mW/cm³ (nom)

20 mW/cm³ (max)

99.6% (nom)

99.4% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 In

itial 

Pe

rm

eab

ilit

y 

(%

µ

i

)

H - DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-10  6µ

Nominal

H = DC Magnetizing Force (Oe)

N = Number of Turns

I = DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

Co

re L

oss 

(mW

/c

m³

)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-10  6µ

500 kHz

250 kHz

100 kHz

50 kHz

25 kHz

10 kHz

5 kHz

1 kHz

400 Hz

60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 In

itial 

Pe

rm

eab

ilit

y 

(%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-10  6µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N = Number of Turns

0

1

2

3

4

5

6

7

10,000

100,000

1,000,000

10,000,000

100,000,000

In

itial 

Pe

rm

eab

ilit

y 

(µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-10  6µ

0

2000

4000

6000

8000

10000

12000

14000

0

1,000

2,000

3,000

4,000

5,000

6,000

B

pk

-P

ea

k A

C 

Fl

ux 

Den

si

ty 

(G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-10  6µ

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

-60 -40 -20

0

20

40

60

80 100 120 140 160

%C

ha

ng

e 

in

 P

er

mea

bi

lit

y

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-10  6µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-10 material 

is a high frequency carbonyl iron. -10 will 

provide high Q up to 150 MHz and is a popular material for 
cable television applications. -10 will produce moderate 
band transformers covering 400 to 700 MHz.

TEL (714) 970-9400  |  FAX (714) 970-0400

20

TM

Revision 20160707 - Generated 2016-Jul-08

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=1.92E-15

a=1.00E-02,  b=3.90E-07,  c=1.46,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=8.67E-02,   b=1.45E-15,  c=1.52E+00,   d=2.47E+00

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=2.90E-03,  b=1.91E+00,  c=5.26E+02,  d=4.97E-01,  e=1.09E+03

a=150

5.2 g/cm³

Density

-14

Mix:

Core Loss (mW/cm³)

=

μi(reference)

14

Color Code

Black/Red

Bsat

15.2kG

18 mW/cm³ (nom)

21 mW/cm³ (max)

91.8% (nom)

89.6% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-14  14µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-14  14µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-14  14µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

2

4

6

8

10

12

14

16

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-14  14µ

0

1000

2000

3000

4000

5000

6000

7000

0

100

200

300

400

500

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-14  14µ

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

h

a

n

ge

 in

 P

e

rm

e

a

b

ilit

y

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-14  14µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-14 material 

has low permeability resulting in a lower oper-

ating AC flux density than other materials with no additional 
gap-loss. The -14 material is similar to -2 material but with a 
higher permeability.

www.micrometals.com

21

TM

Revision 20160615 - Generated 2016-Jun-20

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=1.90E+09,   b=2.00E+08,  c=9.00E+05,   d=5.00E-15

a=1.00E-02,  b=1.78E-06,  c=1.43,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=3.50E+02, b=3.78E-01, c=1.03E+00, d=1.76E+10, e=-1.98E+00, f=1.40E+02

a=1.75E-01,   b=1.98E-07,  c=6.64E-01,   d=1.93E+01

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=3.18E-02,  b=1.75E+00,  c=4.23E+01,  d=5.67E-01,  e=6.98E+02

a=190

36 mW/cm³ (max)

74.7% (nom)

69.4% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

6.4 g/cm³

Density

-15

Mix:

Core Loss (mW/cm³)

=

μi(reference)

25

Color Code

Red/White

Bsat

17.5kG

32 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-15  25µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-15  25µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

105

110

115

120

125

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-15  25µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

5

10

15

20

25

30

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-15  25µ

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

0

50

100

150

200

250

300

350

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-15  25µ

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

3

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

ha

ng

e

 i

n P

e

rm

e

a

bi

li

ty

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-15  25µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-15 material 

is an annealed carbonyl iron providing the high-

est carbonyl permeability. -15 is useful for high Q applications 
below 1 MHz and will provide the broadest band transformers 
covering a typical range from 50 to 500 MHz.

TEL (714) 970-9400  |  FAX (714) 970-0400

22

TM

Revision 20160308 - Generated 2016-Mar-23

where

B

pk

 expressed in gauss,

f

 expressed in hertz, and:

where

H

 expressed in oersteds, and:

a=4.00E+09,   b=3.00E+08,  c=2.70E+06,   d=4.40E-16

a=1.00E-02,  b=1.34E-08,  c=1.55,  d=0.00

where

B

pk

 expressed in gauss, and:

where

f

 expressed in hertz, and:

a=1.57E+03, b=4.50E-01, c=1.25E+00, d=1.16E+17, e=-3.70E+00, f=1.07E+02

a=3.33E-01,   b=7.01E-11,  c=9.00E-01,   d=1.00E+00

where

B

pk

 expressed in gauss,

H

 in oested, and:

where

T

 expressed in celsius, and:

a=6.20E-04,  b=1.96E+00,  c=7.71E+04,  d=9.31E-04,  e=3.60E+03

a=50

20 mW/cm³ (max)

99.5% (nom)

99.4% (min)

Core Loss (100kHz, 140g)

%Perm at DC Bias (200 Oe)

4.8 g/cm³

Density

-17

Mix:

Core Loss (mW/cm³)

=

μi(reference)

4

Color Code

Blue/Yellow

Bsat

14.4kG

18 mW/cm³ (nom)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

H

- DC Magnetizing Force (Oe)

%Initial Perm vs. DC Bias - Mix-17  4µ

Nominal

H

= DC Magnetizing Force (Oe)

N

= Number of Turns

I

= DC Current (A)

L

e

= Effective Path Length (cm)

2

2

65

.

1

3

.

2

3

f

B

d

B

c

B

b

B

a

f

pk

pk

pk

pk











e

L

I

N

H











4

.

0

d

H

b

a

c

i









1

%



f

1

dB

1

bB

a

1

1

e

pk

c

pk

i











%

d

bf

a

c

i







1



10

100

1,000

10,000

10

100

1,000

10,000

C

or

e

 Los

s 

(m

W

/c

m

³)

B

pk

- Peak AC Flux Density (gauss)

Core Loss vs. Bpk - Mix-17  4µ

500 kHz
250 kHz
100 kHz
50 kHz
25 kHz
10 kHz
5 kHz
1 kHz
400 Hz
60 Hz

100

101

102

103

104

105

106

10

100

1,000

10,000

%

 I

n

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (%

µ

i

)

B

pk

- Peak AC Flux Density (G)

%Initial Perm vs. Peak AC Flux Density - Mix-17  4µ

f

N

A

E

B

e

rms

pk











44

.

4

10

8

B

pk

= Peak AC Flux Density (gauss)

E

rms

= RMS Sinwave Voltage (volts)

A

e

= Cross Sectional Area (cm

2

)

N

= Number of Turns

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

10,000

100,000

1,000,000

10,000,000

100,000,000

In

it

ia

l 

P

e

rm

e

a

b

ilit

y

 (µ

i

)

Frequency (Hz)

Initial Perm vs. Frequency - Mix-17  4µ

0

1000

2000

3000

4000

5000

6000

7000

0

500

1,000

1,500

2,000

B

pk

-

P

e

a

k

 A

C

 Flu

x 

D

e

n

sit

y

 (G

)

Magnetizing Force (Oe)

Initial Magnetization Curve - Mix-17  4µ

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

-60

-40

-20

0

20

40

60

80

100 120 140 160

%

C

ha

ng

e

 i

n P

e

rm

e

a

bi

li

ty

Temperature (

°

C)

%Change in Perm. vs. Temp. - Mix-17  4µ

e

cH

aH

H

B

d

b

i

pk

1

1

1











)

20

(

















 

T

a

ppm

i

i





Micrometals Iron Powder Cores, A Division of Micrometals, Inc. - 5615 E. La Palma Ave., Anaheim, California 92807 USA

Ph: +1-714-970-9400,  Toll Free in USA: +1-800-356-5977

www.Micrometals.com

-17 material 

is one of the highest frequency carbonyl irons. 

-17 will provide high Q up to 150 MHz and is a popular mate-
rial for cable television applications. -17 will produce moder-
ate band transformers covering 400 to 700 MHz.