GEOCEL 2938863 FIRESTOP 400 INTUMESCENT ACRYLIC SEALANT 380ML WHITE Geocel Dow Corning Firestop 400 is an intumescent acrylic sealant for internal applications developed to maintain the integrity of fire walls or partitions Dow Corning Firestop 400 does not emit halogenated byproducts under fire conditions p For internal perimeter ppointing around door & window frames & in joints formed where fire rated partition sections meet &8203 p Key benefits Tested to BS476 Part 22 1987 Up to a 4 hour fire rating can be achieved Resists mildew & mould growth 3045 minutes tack free time Good unprimed adhesion to most common construction substrates p