HBT manufactures a full firestop product family from Frielendorf in northern Hessen — ISIFOAM fire protection foams and blocks, ISIBOARD boards, ISILASTIK combination seals, ISIFLEX joint systems, mineral-fibre spray mortars and ISITHERM coatings and collars — for cable, pipe and mixed penetrations. Its systems hold DIBt allgemeine Bauartgenehmigungen, with current approval documents for the ISIFOAM M21-S90 combination seal and the ISIFOAM BDS cable seal published directly on its own site. HBT also supplies application equipment and runs fire protection training seminars.