Air Filters and Chemical Filtration

Gel-Seal ULPA Filter

A U-class mini-pleat panel with a continuous polyurethane or silicone gel channel that forms a compliant seal around a cleanroom terminal knife edge.

Continuous Fluid-Gel Seal
Knife-Edge Housing Interface
U15 Media Option
Cleanroom Terminal Format

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Product Introduction

The gel-seal ULPA filter combines a high-efficiency mini-pleat microglass pack with a continuous fluid-gel trough in the aluminium frame. When the terminal housing's knife edge enters the gel, the compliant material surrounds small surface variations and forms a reusable sealing path without high gasket compression. The media pack is separately bonded into the frame with polyurethane, and protective grids shield both filter faces. This arrangement is widely used in cleanroom ceilings and fan filter units where a consistent perimeter seal must be achieved during repeated filter changes.

Key Features

A continuous gel trough conforms around the housing knife edge and accommodates small flange irregularities.

The perimeter seal requires less compression force than a conventional dry gasket on a large panel.

Separate media-pack potting isolates the filtration seal from the serviceable gel channel.

Rounded aluminium corners and uninterrupted gel continuity reduce vulnerable transitions at frame joints.

Customer Product Concerns

A very high-efficiency terminal filter can still fail its purpose if the large perimeter seal is uneven or difficult to reproduce after replacement.

A dry gasket needs excessive clamping pressure to seal a large ceiling panel.The knife edge displaces compliant gel and forms a continuous seal with low closure force.

Small housing flange irregularities create isolated bypass paths.Fluid gel flows locally around the knife edge and fills minor surface variations.

Gel migration contaminates the visible filter face.A correctly sized enclosed trough retains the selected polyurethane or silicone gel within the frame perimeter.

The seal is broken when the panel is removed for service.The gel can close around the knife-edge withdrawal path when handled within its service limits.

Typical Applications

Semiconductor cleanroom ceilingsPharmaceutical unidirectional-flow zonesFan filter units with knife-edge housingsSterile compounding areasUltra-clean process-tool enclosures

Technical Parameters

Typical construction ranges for a knife-edge gel-seal ULPA panel are listed below.

Core Material	Ultra-fine glass-microfibre ULPA media with thermoplastic mini-pleat separators
Panel Thickness	80–150 mm overall frame depth including gel channel
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 coated-steel or stainless-steel protective faceguard
Core Density	Approximately 35–55 kg/m³ equivalent ULPA media-pack density
Thermal Conductivity	Approximately 0.035–0.045 W/(m·K) for the dry microglass pack
Surface Finish	Natural anodized aluminium with clean white or stainless protective grids
Joint Type	Continuous polyurethane or silicone gel channel for a mating terminal knife edge
Customization	Available based on the intended application and operating environment.

Available Options

U15 or U16 filtration classPolyurethane or silicone gelUpstream or downstream gel-trough orientationSingle-face or dual-face protective grid

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