A high performance, flexible acrylic intumescent acoustic sealant, which in the event of a fire, will swell to provide an inert barrier to smoke and flames. It has non-slumping and rapid skinning properties. Note: The fire resistance achievable with Fireshield AC depends upon the joint design, depth of sealant and substrates being sealed. Solvent-free. Permanently flexible. Non-shrinking. Conforms to EN1366-3; EN1366-4; EN ISO 10140-2: 2010.