Everbuild intumescent acoustic sealant ac95 everbuild ac95900 ac95 acoustic sealant adhesive is an intumescent acrylic sealant and adhesive specifically formulated for fire rated sealing and bonding applications on plasterboard and other kraft lined insulation boards provides up to 5 hours fire resistance tested to bs 476 part 20 en1366 4 2006 acoustic rated to bs en iso 140 3 tested for air permeability to en13141 1 ventilation for buildings performance testing for components produ