Bostik Expanda Foam is a one component, multi purpose polyurethane foam that will not shrink and cures to an airtight, moisture resistant seal. The straw adapter included with each can aids in easy application, especially to fill gaps of all dimensions in the most difficult locations. Suitable Materials: Timber, Brick, Concrete, Galvanised steel, Aluminium, Glass fibre, Cement sheet & Plasterboard Bostik Expanda Foam is a great insulator against heat and cold, It greatly reduces noise, dust and draughts, and blocks access by rodents, Will not shrink, Recommended Uses: The foam has powerful adhesive properties, bonding well to timber, brick, concrete, galvanised steel, aluminium, glass, fibre cement sheet and plasterboard, General cavity filling and insulation work,