BLUE60FRPACK3MM These packers are designed to be used in conjuction with the Blue 60 PU Foam, these intumescent strips are inserted around the frame fixings to provide the foam with a uniform surface during expansion and help prevent the foam flowing out onto the floor under its own weight. – Provides up to 1 hour fire protection on timber door linings – Also suitable for metal partitions – Available in three thicknesses – Can only be used in conjuction with Blue 60 Foam to achieve fire rating