SIL300 silicone sealant is a one-part silicone sealant for use where sealing opening in walls and floors are needed to control the spread of fire, smoke, toxic gas, and water during fire conditions. Features excellent adhesion, bonds to most building materials. Chemical, UV and Ozone resistant for excellent weathering and long service life. Auto-bonding so fresh sealant can be applied over cured sealant. Suitable for penetrations that involve non-combustible penetrants. UL listed and FM approved. Color: Concrete (limestone).