Air Filters and Chemical Filtration

Gel-Seal HEPA Filter

A cleanroom HEPA panel with an integral non-hardening gel trough that receives the housing knife edge to form a continuous fluid seal.

Integral Gel Channel
Continuous Fluid Seal
Room-Side Replacement
Low-Outgassing Gel Option

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Product Introduction

The gel-seal HEPA filter adds a continuous perimeter channel to its extruded-aluminum frame and fills it with non-flowing polyurethane or silicone gel. During installation, the terminal housing's matching knife edge penetrates the gel and creates a fluid barrier around the complete filter perimeter. The mini-pleat microglass pack is separately potted inside the frame, so media sealing and housing sealing remain distinct. Because the gel can conform around minor mating-edge irregularities, this design is widely used in bottom-loading and room-side replaceable cleanroom terminals.

Key Features

A continuous non-hardening gel trough surrounds all four sides of the filter frame.

The mating housing knife edge displaces gel locally to create a resilient fluid barrier.

Separate polyurethane pack potting protects filtration integrity independently of the external seal.

The room-side replaceable geometry reduces access requirements above sealed cleanroom ceilings.

Customer Product Concerns

A cleanroom terminal seal must remain continuous even when the ceiling frame has small dimensional tolerances or the filter is replaced repeatedly.

Small irregularities in a rigid mating surface create bypass around a dry seal.Non-hardening gel conforms around the inserted knife edge and closes localized gaps.

Overtightened clamps distort thin aluminum filter frames.The fluid interface reaches sealing contact with controlled engagement rather than extreme compression.

Repeated room-side replacement tears or permanently crushes conventional foam gaskets.A stable gel channel can re-form around the knife edge after careful filter removal and installation.

Aggressive cleaning chemistry affects an unsuitable seal compound.Polyurethane, silicone or low-outgassing gel is selected to match the terminal environment.

Typical Applications

Pharmaceutical aseptic suitesBiotechnology cleanroomsHospital operating-room ceilingsRoom-side replaceable HEPA housingsLaminar-flow terminal modules

Technical Parameters

Typical construction ranges for a mini-pleat gel-seal HEPA filter are shown below.

Core Material	Water-resistant borosilicate microglass HEPA media formed into hot-melt-spaced mini-pleats
Panel Thickness	90, 100 or 120 mm overall frame depth including gel channel
Effective Width	305-610 mm terminal-module width
Maximum Length	Up to 1220 mm panel length
Steel Facing Thickness	0.50-0.70 mm optional perforated stainless-steel downstream faceguard
Core Density	Approximately 90-150 kg/m³ nominal gel-frame HEPA pack density
Thermal Conductivity	Approximately 0.031-0.038 W/(m·K) for dry borosilicate microglass media
Surface Finish	Anodized-aluminum frame with clean white media and clear or blue non-hardening gel
Joint Type	Integral perimeter gel channel engaged by the matching knife edge of the terminal housing
Customization	Available based on the intended application and operating environment.

Available Options

H13, H14 or ULPA mediaPolyurethane, silicone or low-outgassing gelUpstream or downstream gel-channel orientationStandard or reverse-gel aluminum extrusion

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