Tenmat FIREFLY Protective Housing is compressible intumescent material which expands to form a resilient and stable char. The material is available in sheets of minimum 10mm thickness or alternatively in formed shapes. This product range is a lower density material with lower expansion characteristics; this allows the material to function in a controlled manner without the need for additional restraints. It is suitable for pipe, cable basket, vent duct or downlight penetration seals.