SpecSeal® SIL300 SL Self‑Leveling Silicone Sealant is a high-performance silicone firestop sealant designed to help protect construction joints and through‑penetrations from the spread of smoke, flame, and water. Its self-leveling formula makes it easy to apply on horizontal surfaces like slabs and joints, creating a smooth finish for large-format penetrations.

Once cured, it forms a flexible, durable, fire-resistant barrier that can accommodate building movement while helping maintain long-term system integrity. It also carries a Class 1 W Rating for water resistance (ANSI/UL 1479), verifying its ability to prevent water passage—ideal for assemblies that need moisture protection in addition to firestopping. Built for demanding commercial, industrial, and high-rise applications, SIL300 SL supports reliable, code-compliant fire, smoke, and water protection.

Features:

• Self-leveling
• Silicone sealant
• Fire rated