STI SIL Silicone Firestop Sealant is a one-part,neutral-curing silicone sealant exhibiting superior performance in places where sealing openings in walls and floors are needed to control the spread of fire, smoke, toxic gasses, and water during fire conditions.

STI SIL Silicone Firestop Sealant reacts with atmospheric moisture to form a high-strength, durable seal that will adhere to most building substrates without the use of primers. Does not contain asbestos or PCBs.

STI SIL Silicone Firestop Sealant is designed for use in firestop systems for through penetrations and joints. This product excels in places where greater water resistance is required. Systems have been tested for Class 1 W Ratings per UL1479.

Use between metals, masonry, concrete, and other common construction materials. STI SIL Silicone Firestop Sealant is specially designed for use in static or dynamic joints. The low modulus characteristic minimizes strain on the substrate surface and the elastomeric quality allows excellent recovery from extension and compression cycling.

STI SIL Silicone Firestop Sealant is used through penetrations and joints; high temperatures or movement; electrical, data, or telephone cables; slab edge/curtain wall, safing, and construction gaps; seismic and expansion joints; top-of-wall joints; single or multiple metallic pipes, conduits tubing.

This product can expose you to chemicals including Carbon Black, which is known to the State of California to cause Cancer & Reproductive Harm.

• Low modulus allows up to 50% movement capability.
• Auto-bonding allows the fresh sealant to adhere to the cured sealant.
• Excellent water resistance for water-tight sealing.
• Ozone and UV-resistant for excellent weathering ability and long service life.
• Excellent chemical resistance best choice in polluted or corrosive atmospheres.
• Excellent adhesion to most building substrates (primer less adhesion). UL tested for W ratings.
• Acoustically tested reduces noise transmission.