Cleanroom Installation Accessories

HEPA Gel Seal

A continuous pale-blue silicone gel seal retained in an anodized aluminum channel for knife-edge HEPA filter interfaces in cleanroom terminal housings.

Continuous Gel Channel
Knife-Edge Interface
Low-Outgassing Silicone
Room-Side Serviceability

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Product Introduction

The seal uses a continuous U-shaped aluminum channel filled with compliant silicone gel around all four sides of the filter perimeter. When the housing knife edge enters the gel, the material flows around minor surface irregularities to form a continuous interface without relying on high gasket compression. The gel remains captive in the channel during room-side filter removal and replacement.

Key Features

A continuous four-sided channel eliminates open ends along the active sealing perimeter.

Compliant silicone gel conforms around the mating knife edge and small surface deviations.

The anodized aluminum carrier controls gel position and protects the seal during handling.

Pale-blue coloration provides visible contrast for inspection of the gel surface.

The channel profile supports repeated room-side filter change procedures.

Customer Product Concerns

Terminal HEPA interfaces must remain continuous around the full perimeter while accommodating small housing tolerances and repeated filter change-out.

Rigid sealing surfaces can leave bypass paths where the mating frame is slightly uneven.The compliant gel flows around the entering knife edge and conforms to minor geometric variation.

High gasket compression can make heavy ceiling filters difficult to seat consistently.Knife-edge immersion creates the seal without requiring the same level of bulk gasket compression.

Loose sealing compound can migrate or become contaminated during filter handling.The U-shaped aluminum carrier retains the gel around the complete perimeter.

Seal damage may be hard to see before a replacement filter is installed.The pale-blue gel contrasts with the silver channel for straightforward visual inspection.

Typical Applications

Room-side replaceable HEPA terminal filtersCleanroom ceiling filter housingsPharmaceutical supply and exhaust terminalsLaboratory containment filter interfacesMicroelectronics and healthcare high-efficiency filtration

Technical Parameters

Typical material and dimensional ranges for an aluminum-channel HEPA silicone gel seal are listed below.

Core Material	Low-outgassing silicone gel retained in an anodized aluminum U-channel
Panel Thickness	1.0-1.5 mm nominal aluminum channel wall thickness
Effective Width	10-25 mm active gel channel width
Maximum Length	Up to 1220 mm per continuous frame side
Steel Facing Thickness	0.8-1.2 mm equivalent metal carrier facing thickness
Core Density	Approximately 950-1050 kg/m³ for cured silicone gel
Thermal Conductivity	Approximately 0.15-0.25 W/(m·K) for silicone gel
Surface Finish	Clear or natural anodized aluminum with translucent pale-blue silicone gel
Joint Type	Continuous four-sided gel channel for immersion by a mating housing knife edge
Customization	Available based on the intended application and operating environment.

Available Options

Silicone or polyurethane gel formulationPale blue or clear gel colorCustom square or rectangular perimeter dimensionsChannel depth matched to the housing knife edgeAluminum carrier finish matched to the filter frame

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