fischer Fire Collars – FFC 2 is a powder coated cylindrical steel sleeve which contains a heat reactive graphite based intumescent material that expands during fire. The fischer FFC 2 can be used on its own or in mixed penetration applications in conjunction with the FCPS fischer Coated Panel System. Annular gaps up to 10 mm can easily be backfilled with fischer FiAM Intumescent Acoustic Mastic.