FireStop™ Silicone
FSS Series
NSi FireStop™ Silicone is a primerless, single component silicone sealant. The sealant cures to a durable, flexible silicone rubber when exposed to atmospheric moisture. It is designed for economical use in joint and service penetration firestop configurations and forms a watertight bond with most construction materials. In most cases, no primer is required. NSi FireStop™ Silicone is designed to tool easily. It will not crack or crumble as its physical properties remain stable over time. It may be applied over a wide temperature range, 0ºF to 120ºF (-18ºC to 50ºC), allowing it to be applied in any season. It will remain flexible indefinitely between temperatures of -50ºF and 300ºF (-45ºC and 149ºC). May be applied by caulking gun or trowel. ASTM E 814 and UL 1479.
