Intumescent mastic is used to seal small gaps.
Intumescent paper pack is supplied to suit most fire door dimensions and easily cut to fit locks and door closures.
Astro Flame White Intumescent mastic (310ml) FHg ITS0020
Everbuild hand held B1 fire rated expanding foam 750ml FHg GIR0088
4" Intumescent hinge pads (Pack of 6) FHg FD30/FD60 ITS0030
Intumescent paper pack UK FHg FD30/60 ITS0050