PTFE Microporous Gas Membrane
Model:PTFE Micropore Gas
Kaxite PTFE microporous gas membrane is a biaxially stretched, 100% virgin PTFE film with an interconnected micropore network. Pore size 0.1–0.5 μm, porosity ≥ 75 %, thickness 20–100 μm, temperature −200 to +260 °C, water contact angle > 120°. Gas and vapour pass through, liquid water is blocked. Full pH range chemical resistance. For membrane distillation, gas filtration, degassing, CO₂ capture, fuel cell vents and sensor vents. Available as roll, sheet or die-cut. Factory-direct price, PDF datasheet, custom pore size, quote within 24 hours.
Ref. KXT-MP · PTFE Microporous Gas Membrane Technical File · Rev. 1.3
PTFE Microporous Gas Membrane — 0.1–0.5 μm Pore Size, ≥ 75% Porosity, 260 °C, Chemically Inert
Kaxite PTFE microporous gas membrane is a biaxially stretched, 100% virgin PTFE film with a controlled microporous structure. The pore network allows gas and vapour to pass while blocking liquid water, so it works as a hydrophobic gas-permeable barrier in membrane distillation, gas filtration, degassing, CO₂ capture and venting applications. The PTFE matrix is chemically inert against the full pH range, thermally stable to 260 °C, and mechanically strong enough to be pleated, laminated or die-cut without losing pore integrity. Available in roll, sheet or die-cut form, standard or custom pore size, with material certificate and batch traceability. Factory-direct price, PDF datasheet, quote within 24 hours.
Pore Size 0.1 – 0.5 μm Standard range, custom on request
Porosity ≥ 75 % High gas flux
Temperature 260 °C Continuous service
Contact Angle > 120° Hydrophobic surface
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What Makes a PTFE Gas Membrane Different From a Standard PTFE Film
A standard PTFE film is solid — it blocks everything. A PTFE microporous gas membrane is biaxially stretched under controlled conditions to create a network of interconnected micropores through the film thickness. The pore structure is what allows gas and vapour molecules to pass through, while the hydrophobic PTFE matrix repels liquid water and prevents water breakthrough. This combination — gas-permeable but liquid-tight — is what makes PTFE membrane useful in membrane distillation, gas-liquid contacting, degassing and venting.
Unlike ceramic or polymer membranes, PTFE membrane combines chemical inertness with thermal stability to 260 °C. That means it survives the aggressive chemical streams, hot vapours and cleaning cycles where other membrane materials fail. If your application needs a chemically resistant, hydrophobic gas-permeable barrier, the PTFE microporous membrane is the standard choice.
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Full Specification · KXT-MP
| Parameter | Value / Option |
|---|---|
| Product name | PTFE Microporous Gas Membrane |
| Material | 100% virgin PTFE (biaxially stretched microporous film) |
| Pore size | 0.1 – 0.5 μm standard; custom pore size on request |
| Porosity | ≥ 75 % |
| Thickness | 20 – 100 μm standard; custom thickness on request |
| Temperature range | −200 °C to +260 °C |
| Water contact angle | > 120° (hydrophobic) |
| Chemical resistance | Full pH range (0–14), resistant to acids, alkalis, solvents, oxidizers |
| Gas permeability | High — depends on pore size, porosity and thickness |
| Liquid water breakthrough | Resistant — water entry pressure depends on pore size and surface treatment |
| Mechanical strength | High tensile strength; suitable for pleating, laminating and die-cutting |
| Standard form | Roll (standard widths), sheet, die-cut discs, pleated packs |
| Customization | Pore size, thickness, width, roll length, lamination to support fabric, OEM packaging |
| Documentation | Material data sheet, batch traceability, porosity and pore-size test record |
| Quotation basis | Pore size, thickness, width and roll length, quantity, application medium and temperature, destination port |
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Why PTFE Microporous Membrane Instead of Other Materials
Advantages Over Other Membranes
- Chemical inertness across the full pH range — no swelling, no hydrolysis, no leaching
- Thermal stability to 260 °C — survives hot vapour, steam and aggressive cleaning cycles
- Hydrophobic surface prevents liquid water breakthrough and keeps the gas path open
- High porosity (≥ 75 %) gives high gas flux at low pressure drop
- Mechanically strong — can be pleated, laminated and die-cut without pore damage
Processing Advantages
- Roll or sheet form — easy to integrate into existing production lines
- Laminate to non-woven, woven or mesh support for higher pressure service
- Die-cut to any shape for sensor vents, caps and cartridge formats
- Pore size and thickness can be tuned to match your flux and breakthrough requirements
- Batch-tested porosity and pore size with full traceability documentation
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Where PTFE Microporous Gas Membrane Is Used
01
Membrane Distillation
Hydrophobic barrier between hot brine and cold distillate — water vapour passes, liquid water does not.
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Gas Filtration & Purification
Removes particulates and aerosols from gas streams while keeping chemical resistance and thermal stability.
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Degassing & Venting
Continuous venting of dissolved gases from liquid lines and chemical reactors without liquid loss.
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CO₂ Capture & Gas Separation
Membrane contactor for CO₂ absorption and stripping in amine and carbonate systems.
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Fuel Cell & Battery
Hydrophobic gas diffusion and venting layer in fuel cells and sealed battery packs.
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Sensor & Enclosure Vents
Pressure-equalising vents for sensors, electronics enclosures and medical devices.
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Related Fluoropolymer Products in the Kaxite Range
If you need a different form of PTFE for your project, the same factory supplies the adjacent product lines. For solid PTFE film with no pore structure, see PTFE Film. For thread-seal tape used in pipe joints, see PTFE Tape. For machined PTFE sheet stock, see PTFE Sheet. For the water-filtration grade with controlled pore size, compare with PTFE Microporous Membrane. For the full fluoropolymer catalogue, browse PTFE Products.
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Frequently Asked Questions
What is a PTFE microporous gas membrane?
It is a biaxially stretched, 100% virgin PTFE film with a network of interconnected micropores running through its thickness. The pore structure allows gas and vapour to pass, while the hydrophobic PTFE matrix repels liquid water. This combination makes it useful as a gas-permeable, liquid-tight barrier in membrane distillation, gas filtration, degassing and venting applications.
What pore size and porosity are available?
The standard pore size range is 0.1 – 0.5 μm with porosity ≥ 75 %. Custom pore sizes and thicknesses can be produced to match your gas flux and liquid breakthrough requirements. Send your target flux, gas type and pressure differential and Kaxite will confirm the recommended specification.
What is the maximum temperature and chemical resistance?
The membrane is stable from −200 °C to +260 °C continuous. It is chemically inert across the full pH range (0–14) and resists acids, alkalis, solvents and oxidizers. This makes it suitable for hot aggressive chemical streams where other membrane materials would degrade.
Can the membrane be laminated or pleated?
Yes. The PTFE microporous membrane can be laminated to non-woven, woven or mesh support for higher pressure service, and it can be pleated, die-cut or thermoformed without losing pore integrity. Lamination improves mechanical strength and allows the membrane to be used in cartridge and pleated-pack formats.
Is the membrane hydrophobic, and why does that matter?
Yes — water contact angle is greater than 120°. The hydrophobic surface prevents liquid water from entering the pores, which is what allows the membrane to pass gas and vapour while blocking liquid. This is the key property for membrane distillation and venting applications.
What forms and sizes are supplied?
Standard supply is roll form in standard widths, plus sheet and die-cut discs. Custom roll widths, roll lengths, pore sizes, thicknesses and lamination options are available. OEM packaging and private labelling are supported for qualified volume orders.
Do you provide material certificates and test data?
Yes. Each shipment includes a material data sheet covering PTFE grade, pore size, porosity, thickness, contact angle and temperature limits, plus batch traceability and a porosity/pore-size test record. Third-party inspection can be arranged on request.
How do I request a quotation?
Send your pore size, thickness, roll width and length, quantity, application medium and operating temperature, and destination port. Kaxite replies within 24 hours with a factory-direct quotation, lead time and packing details.
Need a factory price for PTFE microporous gas membrane? Send your pore size, thickness, roll dimensions and application — Kaxite replies within 24 hours with a factory-direct quotation and free sample offer.
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