The Everbuild Pyro Mate Firesil is a neutral cure, elastic silicone sealant which conforms to the EN1366-4 standard for fire retardancy. The sealant has a fire rating of up to 4 hours in certain joint configurations, CE marked under both ETAG 026 Part 3 and EN15651-12012 type F-EXT-INT CC class F 25LM. Pyro Mate can be used for all building joints requiring a fire rating, it will also seal joints, voids and irregular holes in fire walls, partitions and other structures. The neutral cure adheres to most building surfaces, porous and non-porous, while remaining permanently flexible. The white silicone sealant has excellent weathering characteristics, both suitable for internal and external use. Use in joints up to 50mm wide and 25mm deep. Primer is required for most construction substrates. Specifications Colour White. Size 295ml.