Air Filters and Chemical Filtration

ePTFE Membrane HEPA Filter

A cleanroom HEPA panel using expanded PTFE membrane media for low pressure drop, moisture resistance and reduced fibre shedding in sensitive processes.

Expanded PTFE Membrane
Low Fibre Shedding
Moisture Resistant
Chemical-Tolerant Media

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Product Introduction

The ePTFE membrane HEPA filter uses a microporous expanded-polytetrafluoroethylene layer supported by a stable nonwoven substrate and formed into a mini-pleat pack. The membrane's smooth hydrophobic surface resists wetting and does not release glass fibres into downstream process air. Low-outgassing polyurethane potting secures the pack inside an anodized-aluminium frame, while polymer separators maintain even pleat spacing. The design is suited to pharmaceutical decontamination cycles, semiconductor mini-environments and other processes sensitive to moisture, chemical exposure or fibre release.

Key Features

Microporous ePTFE membrane provides HEPA capture with a lower fibre-shedding risk than exposed microglass media.

Hydrophobic filter media withstands brief moisture exposure and recovers without absorbing water into the fibre matrix.

Low-outgassing frame, separator and potting materials suit sensitive manufacturing environments.

The thin membrane pack can provide low initial resistance when matched to the required airflow and efficiency class.

Customer Product Concerns

Sensitive clean processes need final filtration that limits fibre release and remains stable when exposed to humidity or periodic decontamination agents.

Glass fibres released from a damaged filter can contaminate a critical process.The supported ePTFE membrane presents a non-fibrous downstream filtration surface.

Condensation temporarily raises the resistance of conventional fibrous media.Hydrophobic membrane media resists liquid-water wetting and supports quicker recovery after moisture exposure.

Cleaning agents attack media binders or pack adhesives.Compatible PTFE, polyurethane and aluminium components are selected for the planned decontamination chemistry.

Molecular emissions from filter materials interfere with a sensitive process.Low-outgassing substrates, separators and potting compounds reduce avoidable material emissions.

Typical Applications

Semiconductor cleanroom ceilingsPharmaceutical aseptic areasWet-decontamination cleanroom terminalsLithography and optics mini-environmentsSensitive laboratory isolators

Technical Parameters

Typical construction ranges for an ePTFE membrane HEPA cleanroom panel are shown below.

Core Material	Supported expanded-PTFE membrane HEPA media with polymer mini-pleat separators
Panel Thickness	66–90 mm aluminium-frame depth
Effective Width	305–610 mm nominal face width
Maximum Length	Up to 1220 mm nominal face length
Steel Facing Thickness	0.4–0.6 mm powder-coated or stainless-steel protective faceguard
Core Density	Approximately 18–32 kg/m³ equivalent supported ePTFE media-pack density
Thermal Conductivity	Approximately 0.030–0.040 W/(m·K) for the dry supported ePTFE media pack
Surface Finish	Natural anodized aluminium with low-outgassing white or stainless faceguards
Joint Type	Continuous PU gel channel, EPDM gasket or extruded knife-edge seal
Customization	Available based on the intended application and operating environment.

Available Options

H13 or H14 membrane gradeGel, gasket or knife-edge perimeter sealOne-sided or two-sided protective gridLow-outgassing cleanroom component package

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