Knauf Fire protection foam - FPF is 2-component polyurethane foam stored in a cartridge, with halogen-free fire safety additives, intumescent. Knauf Fire protection foam - FPF can be used as a sealing system for cables, cable trays, combustible and non-combustible pipes in walls and floors. Knauf Fire protection foam FPF is particularly characterized by its easy processing. It can be used as a mixed penetration seal (EI 90), as well as a pure cable pe-netration seal (EI 120).