Dowsil Firestop 400 is an intumescent acrylic sealant for internal applications.
Developed to maintain the integrity of fire walls or partitions, it does not emit halogenated by-products under fire conditions.
Resists mildew and mould growth.
Tested to BS 476 Part 22: 1987 and BS 476 Part 7: 1987.
A 2 hour fire rating can be achieved