Special characteristics The pinnacle in durability, flexibility, acoustic + thermal insulation AND airtightness! This elastic PU foam accommodates up to >50% joint movement, thus guaranteeing durable sound and thermal insulation. Acoustic insulation RST,w=60 (-1;-4) dB. Low expansion formulation, fire class B2. Can be processed at temperatures down to -10 degrees Celsius. In combination with SWS products, suitable for passive construction. Colour blue. Applications For thermal and acoustic insulating filling of connection joints around PVC, wooden or aluminium door and window profiles. For insulating and filling expansion joints. For filling joints between wall panels, around pipe penetrations and cavities. Included as standard Flexifoam Click & Fix Blue 750ml