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expanding foam

All purpose, hand held gap filling expanding PU Foam with patented "Genius Gun" application system. Re-usable up to 6 weeks, the Genius Gun applicator enables high precision, single handed use. Ideally suited for the installation of doors and windows, the sealing of pipe penetrations and for the creation of sound-proof sealing, Free of CFC's and HCFC's. Very low emission value once fully cured. Available in aerosol cans of 500ml and 750ml.

Expands to up to 60 times its size!

Composition wise, expanding foam is a mixture of isocyanate and polyol resin that is forced together under pressure. When sprayed, it will expand to up to 60 times it original size, enabling it to fill all gaps and cracks with ease.


high thermal & acoustic insulation

high filling capacity

good adhesion

genius gun applicator

single handed operation

fast curing

expansion rate 35 times initial volume

Frequently Asked Questions

Once opened do you have to use all contents?

Soudal Genius Gun is re-usable for up to 6 weeks after the first application. Simply use the bung supplied in the top cap to block the straw.

Is it necessary to moisten the surface before using foam?

We recommend spraying the substrate with a fine layer of water as the foam needs moisture to cure properly. Benefits of this include:

  • Better cell structure
  • Improved adhesion
  • Faster curing times
  • Better foam in general

If the surface isn’t moistened there is a risk of the foam not curing properly and effecting the rate of expansion. The only exception to this is with 2K foam. This type of foam will harden without water because it contains a chemical within that will enable a reaction.

What is the difference between first resistance and flammability of PU Foam?

Flammability or the reaction to fire is the way in which a material will react in contact with heat/flames and how it feeds the fire. A foam can range from being low/normal/highly flammable

The flammability class B1/B2/B3 according to DIN 4102 indicates the way that a foam reacts to flames.

Resistance to fire according to EN 13501-2 defines how long a system (eg. wall + joint/penetration) can maintain its function while in contact with heat and flames. This is defined by the following factors:

  • Flame resistance (E) = how long a system holds back the propagation of fire
  • Thermal insulation (I)= how long a system holds back the temperature or heat °C (Max average = 140 °C//Max= 180 °C)
Why should i store a can with the valve pointed upwards?

The valve contains a washer that links the outside of the can to the inside; this is not 100% airtight. If water does manage to get inside, it can react with the isocyanate in the cannister and begin to cure, resulting in a valve blockage. If the product has the ‘Duravalve’ system, there is no problem with storing the can horizontally.

How can foam spots be removed?

Fresh foam can be removed with a PU cleaner. Cured foam can only be removed mechanically or by using a special cured foam cleaner.

soudal group

The Soudal Group is the largest independent European manufacturer of sealants, adhesives and polyurethane foams for professional and private users. This Belgian family business, based in Turnhout and founded by Vic Swerts in 1966, has developed into an international player and expert in chemical construction specialities.

Evesham Trade Home Improvement Supercentre supply a wide variety of Soudal’s products including silicone sealants, polyurethane foams, polyurethane sealants, and hybrid polymers.

Interested in Expanding Foam? Contact us today to get a quote!

How can ETC Windows help you?

Our wealth of experience enables us to advise our customers of the most suitable products and services for them. We constantly review our manufacturers and supply chain in order to source and supply high quality materials at competitive prices.

Our team will guide you through the entire purchasing process from start to finish.

Guides & Tips

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