This FAS fire-expanding Fire Door Foam™ and Fire Door Intumescent Acrylic Sealant seals the gap between walls and fire door frames for up to 120 minutes. Quicker than using mineral fibre wool, tested for use with timber and plastic packers. Fire, smoke and acoustic tested to BS476: Pts 20&22; BSEN 1634-1, Certifire approved. www.fireandacousticseals.co.uk