Gas Sensor Vents and Filters

Superior components that maximize the performance of your sensor applications

Protect and enhance sensor performance with cutting-edge technology

Manufacturers around the world trust Porex for cutting-edge technology that outperforms the competition. POREX® materials maximize performance for many sensor applications, including gas absorption, venting, diffusion and electrolyte holding and wicking.

Our customizable solutions for sensor manufacturers can be tailored to specific applications or devices and seamlessly integrated with many manufacturing processes.

Gas Absorption Filters

Filters customized with gas-absorbing material from Porex are designed to target specific gases that may cause a sensor to have a false reading or cause premature degradation of the cell itself.

Expertly and individually designed for your sensor devices, our gas-absorbing filters:

Gas absorbing filters for industrial sensors

Options for customizing gas sensor absorption filters

Key Features & Benefits

  • Effective at capturing a wide range of gases that can be harmful to your sensor, including H2S, SO2, HMDS, organics, alcohols and many others.
  • Absorb larger amounts of the problem gas – Compared to competitive materials, POREX® filters absorb more problem gas per unit volume, lasting longer than competitive products.
  • Contain safe materials– POREX filters are constructed with safe-to-use reagents, unlike competitive products with toxic lead-containing components.

H2S Filter Capacity



Alcohol PPM vs. Time

Protection Vents and Dust Covers

Protection Vents and Diffusion Layer

Equalize pressure and repel contaminants

POREX Virtek® IP-rated PTFE vents are designed to provide fast gas diffusion, while repelling dust, water and other contaminants. Specifically designed for electronic devices, our protection vents:

Options for customizing sensor protection vents and diffusion layer

Key Features & Benefits

  • Deliver fast detection – Allow for faster diffusion of target gases, leading to faster detection.
  • Equalize pressure – Reduce pressure build-up and allow heat to escape electronic enclosures, because air-permeable structure acts as a pressure-relief valve, protecting the enclosure seals from premature failure.
  • Protect from contamination – Protect the internal components by repelling water, sweat, oils and other liquids.
  • Are free of PFOA — Compliant with (EC) 1907/2006 REACH / Regulation (EU) 2019/1021 POP

POREX Virtek® PTFE Membrane 

Item Number IP Rating † WEP* Typical
Typical Airflow
l/hr/cm² @70mbar
Filtration Efficiency**
Max Operating
Temp °C
UL-94/746C Salt Fog$
PMV10 64,67 270 107 0.5 µ 0.13 260°C V-0/f2 No pen.
PMV10L*** 64,67 270 85 0.5 µ 0.3 100°C No pen.
PMV15 64,67 370 75 0.4 µ 0.18 260°C V-0/f2 No pen.
‡PMV15T 64,67 370 75 0.4 µ 0.18 260°C No pen.
PMV20 64,65,68 520 25 0.1 µ 0.25 260°C V-0/f2 No pen.
PMV25 65,67,68 765 17 0.2 µ 0.1 260°C V-0/f2 No pen.
PMV27 65,66,67,68 1050 7 0.1 µ 0.19 260°C V-0/f2 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 – other membranes can also be treated to meet Grade 8 upon request
Properties are typical and not meant for specifications. Selected options and adhesives may effect properties
RoHS, WEEE, REACH Compliant (PFOA Free)


Dimensions (OD x ID in mm)

Material Series 5 x 2 mm* 7 x 3 mm 10 x 6 mm 12.7 x 7.1 mm 20 x 13 mm
*All products offered in 1,000 discs/roll excluding 5 x 2 mm series which is offered in 10,000 discs per roll
Special order items highlighted for higher MOQ. All others are stocked items
3M 93020LE adhesive standard (120 °C continuous use temperature
# Oleophobic treated and high temperature adhesive (good to 150 °C)
M, N, P, W & C are size codes as listed in column heading.
Many other standard and custom sizes available. Contact Porex for more information

POREX Virtek® PTFE Vent Plugs 

Item Number Diameter
mm (in.)
mm (in.)
WEP* mbar IP Rating Typical Vent Airflow
l/hr @70mbar
Max Operating
Temp °C
Filtration Efficiency
UL-94 Rating
PD103032 3.2 (1/8″) 3 (1/8″) 450 64,67,68 1 260°C 0.5 µ 5VA, f1
PD103063 6.3 (1/4″) 3 (1/8″) 450 64,67,68 3.8 260°C 0.5 µ 5VA, f1

*WEP = Water Entry Pressure
† IEC std. 60529; IP 68 is a user defined and results must be verified; product has not been specifically tested – passing is based on results from similar products
Assembly methods include: press fit, over-molding, compression seal, adhesive bonding or flange welding.
Numerous custom and standard options available. Please contact your local Porex sales representative to determine what is available.
Properties are typical and not meant for specifications.
RoHS, WEEE, and REACH Compliant (PFOA Free)

Electrolyte Reservoirs and Wicks

Electrolyte Reservoirs and Wicks

Reservoirs and wicks are needed to retain and deliver an electrochemical system’s electrolyte to facilitate the chemical reaction. POREX® fiber and foam media can be used for reservoirs, general wicking and supporting fluids within electronics and sensors.

Engineered for optimal capacity and directional flow, our electrolyte reservoirs and wicks:

  • Minimize inhalation and skin hazards – Made from safe-to-use PP or PE, our materials eliminate the need for glass wool, which can cause skin irritations and health issues when inhaled.
  • Meet your application specifications – Product fluid retention, density and flow orientation can be tailored to meet your specific application needs.

Related Resources

Electrochemical Gas Sensor Components Brochure

Discover innovative porous polymer solutions and components to increase the performance of electrochemical gas sensors.

Improving Accuracy in Electrochemical Gas Sensors Case Study

See how our Porex engineering team developed a solution to address the challenges encountered in gas detection within industrial settings.

Secrets to Improving the Efficiency of Your Gas Sensors Webinar

Discover how to enhance gas sensor performance in our webinar. Learn to extend sensor lifespan, lower production costs, improve accuracy, and increase efficiency.

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