Pyro mate silicone is a neutral cure elastic silicone sealant which conforms to bs 476 part 20en1366 4 2006 for fire retardancy and has a fire rating of up to 4 hours in certain joint configurations acoustic rated to bs en iso 1403 standards tested for air permeability to en13141 1 standards performance tested for componentsproducts that are suitable for residential ventilation