For internal perimeter pointing around door and window frames, where the integrity of fire walls need to be maintained, and in the small joints formed where fire rated partition sections meet.
DOW CORNING Firestop 400 Acrylic Sealant is a one-part, fire rated intumescent acrylic sealant designed for internal perimeter pointing of fire rated door and window frames, where the integrity of fire walls or partitions need to be maintained. It has good adhesion to a wide variety of substrates without the use of primer. It has intumescent qualities which enable the material to swell under heat conditions producing a fire and smoke resistant seal. DOW CORNING Firestop 400 Sealant does not emit halogenated byproducts under fire conditions.
• A fire rating of up to 2 hours can
• Class 2 surface spread of flame
• Mean toxicity index 2.0
• Good unprimed adhesion to most
common construction substrates
• Remains flexible
• Easy to use, one-component sealant
• Resistant to ozone, ultra-violet
radiation and temperature extremes