Cleanroom Installation Accessories

Polyurethane Foam Sealant

A controlled-expansion polyurethane foam for insulating and filling concealed gaps around cleanroom frames, panels and service openings.

Controlled Gap Expansion
Thermal and Acoustic Fill
Strong Substrate Adhesion
Trim-and-Finish Surface

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Product Introduction

Polyurethane foam sealant is dispensed from a pressurized aerosol can as a moisture-reactive cellular material. It expands within irregular concealed voids, adheres to many common construction substrates and cures into a lightweight insulating fill that can be trimmed after hardening. In cleanroom work it is normally kept behind the exposed hygienic finish, with the accessible joint subsequently closed using a smooth compatible sealant or trim profile.

Key Features

Controlled expansion reaches irregular frame and panel cavities that are difficult to pack manually.

The cured closed- and open-cell structure reduces uncontrolled air movement through concealed gaps.

Adhesion to compatible concrete, masonry, timber, metal and rigid insulation stabilizes the filled cavity.

Hardened excess can be cut back to receive a cleanable cover trim or surface seal.

Customer Product Concerns

Irregular installation cavities need a continuous insulating fill without allowing expanding foam to become the exposed cleanroom surface.

Rigid packing leaves small inaccessible voids behind frames.Fresh foam expands into uneven spaces and bonds to prepared cavity surfaces.

Excessive expansion can bow lightweight panels or distort frames.A low- or controlled-expansion grade is applied in measured lifts with room left for curing growth.

Exposed cellular foam is difficult to clean and can degrade under light.The cured fill is trimmed below the face and protected by a smooth compatible sealant or cover profile.

Dry or dusty substrates produce weak and uneven cure.Surfaces are cleaned and lightly conditioned with moisture where the selected product instructions permit.

Typical Applications

Door and window frame backfillingConcealed cleanroom panel perimeter gapsService sleeve annular voidsCeiling and partition installation cavitiesInsulating gaps behind hygienic trims

Technical Parameters

Typical construction and application ranges for a one-component aerosol polyurethane foam sealant are shown below.

Core Material	One-component moisture-curing polyurethane prepolymer and propellant
Panel Thickness	10-80 mm practical filled cavity depth per controlled application
Effective Width	10-50 mm recommended concealed gap width
Maximum Length	Up to 30000 mm indicative bead length per 750 mL can, depending on bead size
Steel Facing Thickness	0.40-1.20 mm compatible cleanroom panel or frame facing
Core Density	Approximately 15-30 kg/m³ free-rise cured foam density
Thermal Conductivity	Approximately 0.033-0.040 W/(m·K) for cured foam
Surface Finish	Trimmed cellular foam concealed beneath a cleanable sealant or cover trim
Joint Type	Concealed frame, perimeter or penetration cavity fill
Customization	Available based on the intended application and operating environment.

Available Options

Straw-applied or gun-grade canLow-expansion frame gradeSummer or winter application gradeStandard yellow or off-white cured foam

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