3M™ Fire Barrier Silicone Sealant 2000+ is an elastomeric, ready-to-use, single-component, neutral-cure silicone sealant that cures upon exposure to atmospheric humidity. This sealant is designed to form a flexible firestop seal that also acts as a barrier to airborne sound transmission. Sealant is firestop tested up to 3 hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115.