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Everbuild Tecnic Fire Sealant 400 in Grey is a neutral cure, elastic, acoustic rated silicone sealant which conforms to EN1366-4:2010 for fire retardancy and has a fire rating of up to 4 hours in certain joint configurations. Typically used for all building and glazing joints which require a fire rating, sealing joints, voids and irregular holes in fire walls, partitions and other structures; also for maintaining the integrity of pipes and cables that penetrate them and fire rated expansion joints.