Dowsil 400 Firestop Intumescent Sealant White 380ml

Dowsil Firestop 400 is an intumescent acrylic sealant for internal applications, developed to maintain the integrity of firewalls or partitions. This mould resistant silicone can provide up to a 4 hour fire rating and is designed for pointing around door and window frames and in joints formed where fire rated partition sections meet. Fire stop 400 is fast during, with a 30-45 minute tack free time and sticks to most common unprimed construction substrated.