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ABC Firestop Sealant is a flexible medium modulus acrylic-based joint and penetration sealant for indoor and covered outdoor use. With incorporated high solid Firestop compound, it effectively seals joints and seams in compartment walls & floors against the spread of fire, smoke, toxic gases and water up to 4 hours. It adheres to most construction materials and is applicable for areas where fire resistance is mandatory. Advantages: 4 hours fire rated Intumescent Fire resistant Water-based Weather-resistant Non-corrosive Strong unprimed adhesion to most common construction substrates Non-slump Low shrinkage Stays flexible Non-staining to the substrate Paintable after curing Medium modulus Room temperature cure One component sealant Easy to apply Tack-free after curing Low VOC levels