BOSS 760 Firestop Silicone is a single part, low modulus neutral cure silicone firestop. BOSS 760 will prevent the spread of toxic gasses, smoke and fire. BOSS 760 is not affected by UV radiation, will not crack and is capable of sustaining constant vibration and seismic and thermal shock. BOSS 760 has been tested to ASTM E-814 (UL 1479) and meets the criteria for fire/ smoke/ draft stop for BOCA - CABO - UBC - SBCCI - IRC - IBC.