Insudek blocks are made of fire retarded quality. This is achieved by adding a small quantity (<1%) of a fire-retardant agent to the material. The fire-retardant is polymerised into the molecular structure and is insoluble in water, which ensures no fire- retardant leaches from the material into the environment.
Exposed to heat, fire retarded Insudek Blocks shrink away from the heat source. The effect is illustrated by a demonstration in which a hole is burned into a large block of EPS using a torch. When the torch is taken away the fire ceases
THE REACTION TO FIRE BEHAVIOUR SHOULD BE EVALUATED NOT ON THE MATERIAL OR PRODUCT BUT ON “THE HOLISTIC BUILDING ELEMENT OR CONSTRUCTION ELEMENT LEVEL”
A combination of INSUDEK blocks with “specific cover layers” – such as the standard requirement of a structural concrete topping encasing the top and sides of the Insudek blocks together with ceiling board or plaster covering the soffit of the Insudek blocks – constitutes a slab construction which fulfils the fire requirements.