GORE

®

 Acoustic Vents 

For Industrial Applications

RELIABLE ACOUSTIC PROTECTION  

FOR MICROPHONES

Apertures are essential to sound transmission, but  
they can also provide an easy point of entry for 
liquids and particles that can degrade acoustic 
quality and device reliability.

More effective microphone protection

GORE

®

 Acoustic Vents for Industrial Applications 

combine the latest technological advancements with 
more than 30 years of acoustic science expertise 
to provide venting solutions for varied industrial 
applications with sound monitoring or voice-control 
features.

Enhanced sound with advanced ingress 

protection

Our newest vents, 

Series 400 for Superior Fluids & 

Dust Protection

, reduce insertion loss to provide 

enhanced acoustic quality. At the same time, they deliver  
Gore’s highest level of protection against water, other 
fluids and particles that could degrade device reliability 
and longevity.

Typical industrial applications:

  Security cameras

  Two-way radios (industrial use)

 

Outdoor intercom

  Human/machine interface devices

  Smart farming 

 

Traffic monitoring

  Washing machines

  Interactive information displays

  Robotic devices

 

Power grid devices 

Our vents enhance acoustic 
performance while reliably 
protecting against damaging 
contaminants.

GORE

®

 Acoustic Vents

Rising above  

acoustic challenges

GORE Membrane 
ensures pressure 
equalization while 
allowing sound 
transmission

Liquid and particles  
are repelled

Series 400 for Superior Fluids & Dust Protection —  

Our most advanced ingress protection enables 

outstanding acoustic performance

Series 400

 eliminates the typical trade-offs between reliable waterproofing 

and superior sound quality. It provides both a high level of ingress 
protection and superior sound quality, offering a balanced solution for 
even the harshest environments. 

Liquid protection that exceeds typical IP standards

Using Gore protocols, we tested Series 400 against the IPx8 standard.  
The result: No water leakage while submerged at 2 meters for 30 minutes! 
Series 400’s oleophobic membrane also effectively repels oils, common 
industrial fluids and cleaning solutions that can threaten devices that use 
ordinary vent materials. With this level of protection, Series 400 could 
mean longer-lasting devices. 

Particle protection that meets today’s needs

Of course, Series 400 has been qualified to meet the IP6x dust-proof 
performance standard. Additional Gore test protocols that better reflect 
real-world conditions also show how well this vent performs in assembled 
devices. For example, Series 400 can protect against a wide range of 
particles — even those associated with poor air quality, such as smog  
and dust particulates which may be only 1–10 µm in size. 

Series 200 for Splash & Dust Protection —   

Good environmental protection combined with 

enhanced broadband acoustic transparency

Series 200

 is for industrial devices that face dust and splash hazards yet 

require very good acoustic performance. Our membrane maintains sound-
wave integrity, so it delivers reliable environmental protection without 
compromising sound quality. 

Protects against sprays and particles

Series 200’s oleophobic non-woven membrane provides a higher level 
of spray protection at a given level of acoustic performance. Its three-
dimensional tortuous path structure also traps small particles much more 
efficiently than ordinary woven mesh vents. By providing a more effective 
barrier to particles of varied sizes and shapes while protecting against 
acoustic degradation, Series 200 can enhance microphone performance 
and device reliability.

Characteristics / Performance

Series 234

Series 434

Water protection: IP rating (IEC 60529)

 1

 

IPx4

IPx4, IPx5, IPx6, IPx7, IPx8

 2

Comparative water spray efficiency

 3

75%

100%

Dust protection: IP rating (IEC 60529)

 1

IP5x

IP6x

Insertion loss @ 1kHz

 4

 (ID 2.0 mm)

< 2.0 dB

< 2.0 dB

Membrane type

Cellulose  /PET non-woven

ePTFE

Membrane characteristic

Oleophobic

Reference thickness

 5

0.33 mm

0.20 mm

Membrane color

Dark gray

Black 

Support ring

N/A

PET

Recommended part orientation

Mount on interior  

of housing

Mount on interior  

of housing or on PCB

Temperature resistance

–40 °C to 75 °C

–40 °C to 100 °C

Adhesive type installation

Silicone based

EU-RoHS

 6

Meets threshold requirements

1.  IP ratings for assembled devices depend on the design of the product housing. IPx5, IPx6 feasible with adequate protection grill or cap.

2.  Test parameters IPx8: 2.0 m water @ 30 min

3.  Per Gore Water-Spray-VSZ-WI-026: based on IEC60529 - IPx4, test plate: thickness: 2.0 mm; hole: 2.54 mm, average spray efficiency  

0% efficiency represents open conditions; 100% represents waterproof

4.   Tested using a typical MEMS microphone system, membrane ID 2.0 mm. Design of assembled device will affect performance.

5.   Nominal aggregate thickness of all layers. Actual thickness may vary due to the compressibility of materials.

6.  To the best of our knowledge, the parts listed above do not have any restricted substances above the maximum concentration values listed in RoHS 

Directive 2011/65/EU. This information is based on our current level of knowledge and does not constitute a representation or warranty beyond those 

contained in our standard terms and conditions.

P/N

ID [mm]

OD [mm]

AVP2341.53.5

1.5

3.5

AVP2342.04.0

2.0

4.0

AVP2342.55.0

2.5

5.0

AVP2343.06.0

3.0

6.0

P/N

ID [mm]

OD [mm]

AVP4341.53.5

1.5

3.5

AVP4342.04.0

2.0

4.0

AVP4342.55.0

2.5

5.0

AVP4343.06.0

3.0

6.0

Splash & Dust Protection:  

Series 234

Superior Fluids & Dust Protection: 

Series 434

OD

ID

b

X1

A

b

Y

X2

X1

Z

Series 234

Series 434

OD/ID = Outer/Inner diameter 

 

= Active area

 = 

Adhesive ring

A 

= Non-woven material

X1 

= Adhesive 1

X2 

= Adhesive 2

Y 

= ePTFE membrane 

Z 

= Support ring 

b 

= Reference thickness

See Product Characteristics table 

Tolerance of dimensions: ± 0.20 mm

Design and Dimensions

OD

ID

b

X1

A

b

Y

X2

X1

Z

OD

ID

b

X1

A

b

Y

X2

X1

Z

Packaging:

 Supplied on sheets

Packaging:

 Supplied on sheets

P

TV

-1

36

-D

SH

-E

N

-M

A

R

21

About Gore

W. L. Gore & Associates is a global materials science company dedicated  
to transforming industries and improving lives. Since 1958, Gore has solved 
complex technical challenges in demanding environments — from outer 
space to the world’s highest peaks to the inner workings of the human body. 
With more than 10,500 Associates and a strong, team-oriented culture, 
Gore generates annual revenues of $3.7 billion.

Gore develops products and technologies that address complex product 
and process challenges in a variety of markets and industries, including 
aerospace, automotive, pharmaceutical, mobile electronics and more. 
Through close collaboration with industry leaders across the globe, Gore 
enables customers to design their products and processes to be safer, 
cleaner, more productive, reliable, durable and efficient across a wide range 
of demanding environments.

Learn more at gore.com/protectivevents

A materials science company  
dedicated to transforming industries  
and improving lives

The GORE Membrane:  

The heart of our venting technology

What gives our vents their superior performance qualities is expanded 
polytetrafluoroethylene (ePTFE). Gore invented this remarkably versatile 
polymer, and its capabilities are at the heart of all our products.   
Our company’s expertise is in tailoring the structure and properties of  
ePTFE to create a wide range of GORE Membranes that are engineered  
to meet the challenges of  diverse — and demanding — applications.

Our knowledge of fluoropolymers and 
our advanced engineering capabilities 
are at the heart of a wide range of 
remarkable materials.

W. L. Gore & Associates GmbH

Hermann-Oberth-Str. 26, 85640 Putzbrunn, Germany

T

 +49 89 4612 2211    

F

 +49 89 4612 2302    

E

 protectivevents@wlgore.com

gore.com/protectivevents

FOR INDUSTRIAL USE ONLY. Not for use in food, drug, cosmetic or medical device manufacturing, processing, or packaging operations. 

 

GORE

®

 Protective Vent(s) are manufactured under the generic industrial ISO 9001 quality system. No other certifications can be provided by Gore for this 

GORE

®

 Protective Vent. All technical information given is based on Gore’s previous experiences and/or test results. Gore gives this information to the best of its 

knowledge, but assumes no legal responsibility. Customers are asked to check the suitability and usability in the specific application, since the performance of 

the product can only be judged when all necessary operating data are available. The above information is subject to change and is not to be used for specification 

purposes. Gore’s terms and conditions of sale apply to the sale of the products by Gore.

GORE, 

Together, improving life

 and designs are trademarks of W. L. Gore & Associates. © 2021 W. L. Gore & Associates GmbH

INTERNATIONAL CONTACTS

Australia 

+61 2 9473 6800

Benelux 

+49 89 4612 2211

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+49 89 4612 2211

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+39 045 6209 240

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