Expanding Foams

Expanding foam, also known as insulation foam, is a product that provides airtight insulation around materials, joints and components. The foam acts as a filler to seal cracks and holes around parts and fittings. These sealants form a barrier to repel moisture, insects and air from creeping into gaps.

Expanding foam normally has a mousse-like consistency, which hardens via a chemical process when it comes in contact with atmospheric humidity. Once cured or hardened, the foam will not expand or shrink, being durable against damp and other weather effects.

What is expanding foam used for?

Expanding foams have many uses across industry and retail. The foam sealant can be used to fill the openings and insulate around window frames, window sills and awkward gaps, and to seal pipes and hoses.

Expanding foams are also applied in indoor building activities and in repair work to ceilings, walls and cavities. The foams are rot-resistant and can be used to bond and seal the rings around manholes.

How to use expanding foam?

A foam gun or a nozzle applicator can be used for the application. Spray foam directly into the required area, as the PU foam needs moisture to expand and cure it is advised that if applying in a dry area the user lightly mists with water first. Once cured any excess can be cut or sanded off or additional foam can be added.

Expanding foam comes in different variants, usually in an aerosol can, customised to the task they need to be used for, whether filling, coating or barricading.


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Description Price Model Package Size Product Form Application Colour Fire Rating Package Type Maximum Operating Temperature Minimum Operating Temperature Trade Name Chemical Composition Odour Operating Temperature Range Tensile Strength
RS Stock No. 488-1617
Mfr. Part No.500ML FOAM 360
£10.75
Each
Units
- 500 ml Polyurethane Foam - Yellow - Aerosol - - - - - - -
RS Stock No. 630-1006
Mfr. Part No.742582
BrandHenkel
£11.89
Each
Units
Terostat PU 92 310 ml Paste Bonding, Sealing Black - Cartridge +70°C -40°C - - - -40 → +70 °C -
RS Stock No. 250-6954
Mfr. Part No.MPU500
£11.60
Each
Units
- 750 ml Foam - Yellow - Aerosol +90°C -40°C - - - -40 → +90 °C -
RS Stock No. 908-2812
Mfr. Part No.32516
BrandCRC
£6.03
Each
Units
- 500 ml Foam Filling, Fixing, Insulation, Modeling Green - Aerosol +90°C -40°C PU Foam 2-in-1 Diphenylmethandiisocyanate, Homologues, Isomeres Characteristic -40 → +90 °C 107 (Manual) kPa, 76 (Gun) kPa
RS Stock No. 630-1012
Mfr. Part No.739215
BrandHenkel
£11.89
Each
Units
Terostat PU 92 310 ml Paste Bonding, Sealing White - Cartridge +70°C -40°C - - - -40 → +70 °C -
RS Stock No. 908-2818
Mfr. Part No.32477
BrandCRC
£11.43
Each
Units
- 500 ml Liquid Filling, Fixing, Insulation, Modeling White - Aerosol +90°C -20°C STP Foam 2-in-1 1-Propanol, 2,2-Dimethyl-, Tribromo Deriv., Castor Oil, Dimethyl Ether, Isobutane, Propane, Tris (2-chloro-1-methylethyl)-Phosphate Characteristic -20 → +90 °C 38 (Gun) kPa, 87 (Manual) kPa
RS Stock No. 908-2821
Mfr. Part No.32474
BrandCRC
£22.79
Each
Units
- 750 ml Liquid Filling, Fixing, Insulation, Sealing Green 2 h Aerosol +90°C -40°C PU Foam Fire Resist 2-in-1 1-Propanol, 2,2-Dimethyl-, Tribromo Deriv., Castor Oil, Dimethyl Ether, Diphenylmethandiisocyanate, Homologues, Isobutane, Isomeres, propane, Tris (2-chloro-1-methylethyl)-phosphate Characteristic -40 → +90 °C 100 (Manual) kPa, 81 (Gun) kPa
RS Stock No. 630-1028
Mfr. Part No.742460
BrandHenkel
£11.89
Each
Units
Terostat PU 92 310 ml Paste Bonding, Sealing Grey - Cartridge +70°C -40°C - - - -40 → +70 °C -
RS Stock No. 908-2824
Mfr. Part No.32475
BrandCRC
£9.09
Each
Units
- 400 ml Liquid Bonding, Filling, Sealing White - Aerosol +90°C -40°C PU Foam Fast Grip Alkanes, C14-17, Chloro, Castor Oil, Dimethyl Ether, Diphenylmethandiisocyanate, Ethanediol, Ethylene Glycol, Homologues, Isobutane, Isomeres, Propane, Tris (2-chloro-1-methylethyl)-phosphate Characteristic -40 → +90 °C -
RS Stock No. 182-6343
Mfr. Part No.32231
BrandCRC
£10.02
Each
Units
- 500 ml Applicator Gun - Transparent - Aerosol - - PU Foam Cleaner - Characteristic - -
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