The everbuild range of fire sealants are five hour rated one part emulsion acrylic based intumescent acoustic sealants that gives a firm yet flexible seal to joints in a variety of fire rated structures tested following the principles of bs 476 part 20 1987 as detailed in warrington fire research report no 144508b feb 2005 the product in suitably designed joints will resist the passage of fire for up to 5 hours the selected fillers used in this formulation also make it suitable for use as an aco