Sensor Housing Protection

A Perfect-Fit Protection Membrane for Gas Sensor Venting Applications

Venting solutions

Increasing requirements in air quality as well as the rising industrial safety demands are driving the need for gas sensor technology that performs reliably, accurately, and for longer lifespans. Whether these be wearables, smart home applications, or industrial applications such as power generation or chemical facilities, a key performance driver of these gas sensors is the track-etched membrane technology which can facilitate faster detection, pressure equalization, and protection against contaminants. Oxyphen utilizes decades of experience to supply track-etched membrane technology with the broadest range of pore sizes and distributions – all while offering the lowest tolerances on the market.

Our unique membranes offer distinct advantages over mechanical vents or physical openings, since intrusion of dust and moisture can be avoided and there are no moving parts that can stick or only work in one direction. Unlike competing track-etched technology, Oxyphen’s membranes will not have affinity to shrinkage or deformation and can withstand temperature fluctuations as well as exposure to most chemicals.  

Sensor Housing Protection
Sensor Housing Protection
sensor housing protections
Track-etched membrane technology facilitates faster detection, pressure equalization and protection against contaminants in sensors.

When manufacturers partner with Oxyphen, they can be assured of receiving a consistent membrane permeability that is 100% quality controlled, free of PFOA ingredients, and per their specific application’s pore size, air flow rate, adhesion level, and material requirements.  

We look forward to partnering with you on new opportunities – from the conceptual phase to the product launch – so that we can bring your next-generation sensor product to life. 

  • Allows for faster diffusion of target gases, leading to faster detection 
  • Reduces pressure build-up and allows heat to escape electronic enclosures, preventing premature failure
  • Protects the internal components by repelling water, sweat, oils and other liquids 
  • Free of PFOA: Compliant with (EC) 1907/2006 REACH / Regulation (EU) 2019/1021 POP 
  • Optimal flow control for better sensor accuracy 
  • Membrane permeability can be customized precisely to customer requirements 
  • Chemical inertness for most substances 
  • Good temperature resistance (-40OC to +180OC) 
  • Better recyclability
  • No material shrinkage 
  • Great weldability 
  • Economically friendly compared to ePTFE 
  • High mechanical resistance 
  • Injection molding (2K)
  • Punch & welding
  • Cleanroom ISO class 7
  • Membrane assembly
  • Packaging for OEM businesses
Dimension Specification
Water Entry Pressure
Up to 3 bar
Air Flow
Up to 371 / (bar cm2 min)
Temperature Range
-40 to +180°C


  • PET Track-Etched Membranes unlaminated​​
  • PET Track-Etched Membranes laminated with PET/ PP non-woven material​
  • Additional membrane materials available upon request​​
Specification Unique-Mem® Track-Etched Membranes RoTrac® Track-Etched Membranes
Bandwidth (mm)
10, 13, 14.5, 20 & custom sizes
High Quality Raw Materials
PET – naturally slightly hydrophilic
PC – naturally slightly hydrophobic
PET-Membrane/ PET-Nonwoven –harder
PET-Membrane/ PP-Nonwoven – softer
Pore Size Ranges
0.1µm to 10µm
0.2µm to 3.0µm
Pore Density Ranges
105 to 109 pores per cm2
2×106 bis 3×108 pores per cm2
Thickness Ranges
8µm to 50µm
90µm to 220µm
Temperature Ranges
– 40°C and 160°C (for special application < 200°C)
– 40°C and 130°C (for special application < 160°C)
Air Flow Ranges
Up to 800 l / (bar cm2 min)
Up to 37 l / (bar cm2 min)
Hydrophilic Treatments
Various hydrophilic treatments increase water flow rate and wetting abilities of the membrane (example: PVP treatment)
Hydrophobic / Oleophobic Treatment:
Grade up to 7.5; AATCC TM 118
Salt spray resistance test2
According to IEC 60068-2-52, based on validation by the customer
Temperature resistance test1
In accordance with ISO 16750-4
Ice water shock test1&2
In accordance with ISO 16750-4
Climate resistance test
In accordance with ISO 16750-4
Chemical resistance test1
According LV124/ ISO 16750-5
IP Protection1
IP 64/65/66/67/68, according to DIN 40050

1 Testing in Progress

2 Based on Customer Validation
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Related Resources

OxyDisc® Product Brochure

Learn more about OxyDisc® die-cut membrane discs that can be produced using either hydrophobic or hydrophilic membranes and easily handled and mounted using multiple assembly options to suit a variety of industries.

OxySeal® Product Brochure

Learn more about OxySeal® pressure compensation units that are designed to be a plug & play solution for easy integration into existing product assemblies while protecting from any environmental impact.

OxyPad® Product Brochure

Learn more about OxyPad® 100% PFOA-free hydrophobic and oleophobic-treated self-adhesive pads that provide consistent pressure equalization to reduce seal stress, minimize condensation, and protect the housing.

Register for our On-Demand Webinar

Delivering Precision & Control: An Introduction to Track-Etched Membrane Technology

Related Products

OxyPad Self-Adhesive Pads

OxyPad® Self-Adhesive Pads

OxyPad® membrane pads, which are easily integrated inside or outside your housing design, promote consistent pressure equalization and protection against water, dust, and other harmful particulates.

OxyDisc Die-Cut Membrane Discs

OxyDisc® Die-Cut Membrane Discs

OxyDisc® die-cut membrane discs can be easily mounted and produced using either hydrophobic or hydrophilic membranes for a variety of filtration or venting application requirements. 

OxySeal Pressure Compensation Units

OxySeal® Pressure Compensation Units

OxySeal® pressure compensated venting plugs, which are available with hydrophobic or oleophobic treated membranes, can prevent the ingress of liquid, water, dust, dirt, salt, and other contaminants.

Membrane Technologies Available

Unique-Mem track-etched membranes


Unique-Mem® Unlaminated Track-Etched Membranes

Unique-Mem® track-etched membranes, available as hydrophilic or hydrophobic, are characterized by cylindrical shaped pores penetrating the membrane in different angles. They have a smooth flat surface and well-defined flow rates.

RoTrack Track-etched Membrane


RoTrac® Laminated Track-Etched Membranes

RoTrac® track-etched membranes are Unique-Mem® membranes that are supported with non-wovens (PP or PET) to create a more robust membrane. They are available as either hydrophilic or hydrophobic membranes.

Fiber-Based track-etched membranes


Fiber-Based Membranes

Fiber-based membranes are surface modified using a super-hydrophobic coating to repel water and other liquids while still allowing maximum airflow.

Contact Us

Interested in speaking with one of our track-etched membrane experts?