Three-quarter view of white ePTFE membrane HEPA media roll

Air Filters and Chemical Filtration

ePTFE Membrane HEPA Filter Media

A microporous expanded-PTFE membrane laminated to a stable support web for clean, chemically resistant HEPA and ULPA filter conversion.

Microporous ePTFE Layer
Low Fibre Shedding
Chemical Resistance
High-Cleanliness Laminate

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Product Introduction

The media combines a thin expanded-polytetrafluoroethylene membrane with a stronger nonwoven or synthetic support. The ePTFE node-and-fibril structure provides fine particle retention at the surface, while the carrier protects the membrane through pleating and pack assembly. The laminate is naturally hydrophobic and resistant to many chemicals, making it attractive for sensitive microelectronics, pharmaceutical and aggressive-air applications. Finished performance is established after the media is pleated and sealed into a complete filter.

Key Features

Surface-loading membrane retains fine particles without exposed glass fibres.

Hydrophobic ePTFE resists moisture penetration during normal service.

The support layer provides tensile strength for pleating and conversion.

Broad chemical resistance suits selected corrosive process environments.

Customer Product Concerns

Ultra-clean processes need high particle retention without glass-fibre shedding or moisture sensitivity.

Glass-fibre fragments are undesirable near sensitive products.An ePTFE surface layer provides particle capture without an exposed microglass face.

Condensation changes the resistance of a hydrophilic medium.The hydrophobic membrane limits wetting by liquid water droplets.

The thin membrane tears during pleating.A bonded support web carries handling loads through conversion and pack assembly.

Aggressive process vapours degrade ordinary fibre binders.PTFE chemistry offers broad resistance to many acids, bases and solvents.

Typical Applications

Semiconductor cleanroom filtrationPharmaceutical terminal HEPA filtersBattery manufacturing dry roomsCorrosive process airLow-shedding clean equipment

Technical Parameters

Typical physical ranges for an ePTFE membrane air-filter laminate are listed below.

Core Material	Microporous expanded PTFE membrane laminated to spunbond polyester or polypropylene support
Panel Thickness	0.15–0.45 mm total laminate thickness
Effective Width	500–1500 mm usable roll width
Maximum Length	Up to 50000 mm roll length depending on laminate basis weight
Steel Facing Thickness	0.20–0.40 mm stainless-steel support screen when the laminate is assembled into a protected HEPA pack
Core Density	120–350 kg/m³ apparent laminate density
Thermal Conductivity	0.04–0.08 W/(m·K) through the porous laminate
Surface Finish	Smooth white hydrophobic ePTFE membrane face on a clean support web
Joint Type	Thermal or adhesive laminate supplied in rolls for mini-pleating and pack edge sealing
Customization	Available based on the intended application and operating environment.

Available Options

Polyester or polypropylene backingHEPA and ULPA retention gradesDifferent basis weightsCustom roll widths and winding direction

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