Automotive – Lighting & Electronic venting

EV Battery Vents

PTFE Material Designed Specifically for EV Battery Packs

Filtration solutions
diffusion outline
Application Solutions
Wicking solutions
Venting solutions

Robust PTFE Material Designed Specifically for EV Battery Packs

As the demand for electric vehicles (EVs) continues to rise, ensuring their safety and reliability is paramount. At Porex, we provide cutting-edge EV battery vents to renowned companies worldwide. Our vents enable proper pressure equalization and quick gas release in case of failure, while effectively preventing dust and moisture infiltration into the battery.

With our expertise in material science, Porex offers customizable porous polymer solutions for various automotive venting needs. Our engineers can tailor a solution specific to your device, leveraging a range of materials, chemical compositions, geometries, assembly techniques, and additives. Experience the benefits of POREX Virtek™ PTFE EV battery vents for enhanced pressure equalization and ventilation.

Battery and Fuel Cell

Electric Vehicle Battery Burst Vent

Protect your EV battery packs with high-performance Porex Virtek PTFE dual-stage safety vents without needing burst pins. Our fully-assembled vents give you a fast-release solution for thermal runaway and off-gassing that allows for both passive air venting and burst action in one component.


  • Robust structure does not damage easily like expanded PTFE material
  • No change in airflow when handled
  • IP rated for extreme thermal cycling
  • Easy, flexible assembly – attach via ultrasonic, heat welding, overmolding, or a variety of other techniques
  • Fully assembled
  • Can be designed to act as a breather and safety vent
  • 100% PFOA free – Compliant with (EC) 1907/2006 REACH / Regulation (EU) 2019/1021 POP

Porex Virtek® PTFE – Automotive / Oleophobic product range (hydrophobic & oleophobic)

Item Number IP Rating † WEP* mbar
Typical Airflow
l/hr/cm² @70mbar
Filtration Efficiency**
Max Operating
Temp °C
Salt Fog$
PMA10 64,67 370 75 0.4 µ 0.18 260 No pen.
PMA15 65,67,68 520 25 0.1 µ 0.25 260 No pen.
PMA20 65,66,67,68 1050 7 0.1 µ 0.19 260 No pen
† IEC std. 60529; IP 68 is a user defined and results must be verified by the user
*WEP = Water Entry Pressure
** According to IEST RP-CC007.2 2009
$ASTM B117-11 test method
***Laminated polyolefin mesh backing
Oleophobic, AATCC TM 118 – Grade 8
Moisture Vapor Transmission Rate approx. 900g/m2/day. ASTM E96-16 water escaped from sealed cup @ 23±2°C, 50±10%rH chamber.
Properties are typical and not meant for specifications. Selected options and adhesives may affect properties
RoHS, WEEE, REACH Compliant (PFOA Free)

Options for customizing sintered PTFE EV battery vents

Physical properties

When incorporating a sintered PTFE membrane into your product, it’s critical to understand the physical properties impacting the materials and functionality of the part including:

Understanding typical material properties will guide you in selecting the right polymer for your device’s function and operating conditions.  The above characteristics can be highlighted or downplayed based on your specific product needs.  Below is a chart that shows the common materials with their physical properties; however, this is not an exhaustive list.

  • Air flow rate: the volume of air being delivered at a given pressure drop through a specific area. This is a critical measure for designing a venting membrane. One important thing to note – air flow rate will increase through the same vent as the pressure drop increases.
  • Water entry pressure (WEP): the amount of water pressure required to have water break through the membrane. This is a critical measure when designing a water-resistant venting or filtering membrane.
  • Operating temperature: the temperature range at which the part will be required to operate. For Porex Virtek PTFE membrane, this value is 260°C / 500°F continuous.
  • Other key characteristics: Porex Virtek PTFE membrane is an extremely versatile material that is used in numerous markets and applications. Other application-specific characteristics that may be required for your application can include filtration efficiency, moisture vapor transmission rate, Gurley number, % reflectivity, and dielectric properties.

Chemical properties

Porex Virtek PTFE waterproof membrane is one of the most chemically resistant materials available in the market. There are only a handful of fluorinated acids that are not chemically compatible with sintered PTFE membranes, so it is always your safest choice if unknown chemicals may be in contact with the component.



Acids (non oxidizing)






Aromatic Solvents


Non-Polar Alphatic


Polar-Aprotic Solvents


Polar-Protic Solvents


Halogenated Solvent


Oxidizing Agents


Material options

Polytetrafluoroethylene (PTFE)
For applications in need of ultra-hydrophobicity, high-temperature tolerances, high chemical resistance, and excellent robustness, sintered and skived PTFE membrane technology is a perfect choice.

Using our wide range of customizable solutions, we work closely with your engineering team to define your specifications and select the best PTFE membrane for your application.

Additive options

Below are some common additives and treatments that expand the potential functionality of your PTFE membrane:

  • Oleophobic treatment
  • Polypropylene scrim support layer
  • Adhesive backing
  • Screen Printing

Geometric options

Porex Virtek PTFE membrane material begins as a 330 mm wide format (between 0.1 and 3.0 mm thick) and can be cut into porous PTFE sheets and other format options such as:

  • Slit rolls (8 – 330 mm)
  • Die-cut discs and various shapes
  • Rotary-cut plugs and discs
  • Cut discs “in web”
  • Water jet cut shapes
  • Zoned adhesive disc and other shapes
  • Rods & molded or spiral tubes
  • Thermoformed shapes
  • Porous PTFE sheets

Our engineers can work with you to better understand your manufacturing process and determine which size, shape, and dimensions are the best fit for your application.

Assembly & converting options

Customizable assembly and converting options for sintered PTFE are endless. Some of the more common methodologies include:

  • Thermal & ultrasonic welding
  • Overmolding
  • Die-cutting
  • Press fit
  • Pressure-sensitive adhesive (PSA)

To potentially decrease your assembly time and complexity, our engineers can work with you to better understand how your final product or device will be made. In many cases, we can combine multiple parts into one that is custom engineered.

If you require secondary processing of sheet and film products to meet your product design challenges, Porex also offers a Preferred Converter Program that can serve smaller order quantities.

Related Resources

Porex Virtek® IP-Rated Protection Vents Brochure

Explore the portfolio of robust Porex Virtek® IP-Rated Protection Vents for electronics and automotive applications.

PTFE Video Venting Series: Porex Virtek PTFE vs ePTFE in a Battery Safety Vent Emergency Situation

A short video highlighting the advantages of Porex Virtek® PTFE over ePTFE in battery safety vent emergency situations.

IP-Rated Vents for Automotive Applications Brochure

Discover the capabilities of POREX® IP-rated PTFE vents specifically designed for automotive applications, enabling rapid pressure equalization and ensuring effective protection.

EV Venting Membranes Brochure

See why OEMs rely on Porex Virtek when it comes to automotive venting applications with PTFE hydrophobic and oleophobic membranes.