STI Intumescent Firestop RTC Collar, 6PK

• Can be used with all common construction materials, including concrete floors, concrete over steel deck, concrete walls, concrete block walls and gypsum.
• One collar fits 3 and 4 inch pipes and couplings for an exact fit.
• Expansion starts at 320° F (160° C) and continues expanding up to 1,000° F (538° C) to ensure a tight seal.

Small profile to fit into small cracks

Not water soluble, so it can be used on water supply pipes and other pipes that might make condensation.

Flexes without flake-off to prevent eye hazards

Expands quickly to help prevent the spread of fire and smoke.

Swells up to 60 times its normal size to seal off every little crack and crevice.