Definition of reaction to fire

Reaction to fire relates to the degree to which a product will contribute by its own decomposition, to a fire under specified conditions. Under the European Classification system, products, other than floorings, are classified as A1, A2, B, C, D, E or F (with class A1 being the highest performance and F being the lowest) in accordance with BS EN 13501-1. Class F is assigned when a product fails to attain class E. Untested products cannot be classified in accordance with BS EN 13501-1.