Non-combustible material definition

Non-combustible material – This is the highest level of reaction to fire performance. A non-combustible material is – (a) a material classified as non-combustible in tests following the procedures in BS 476: Part 4; (b) a material which when tested to BS 476: Part 11 does not flame nor cause any rise in temperature on either the centre (specimen) or furnace thermocouples; or (c) a material classified as Class A1 in accordance with BS EN 13501 Fire classification of construction products and building elements: Part 1: Classification using test data from reaction to fire tests when tested to – (i) BS EN ISO 1182 Reaction to fire tests for building products – Non-combustibility test; and (ii) BS EN ISO 1716 Reaction to fire tests for building products – Determination of the heat of combustion. Typical examples of such materials to be found in buildings include totally inorganic materials such as concrete, fired clay, ceramics, metals, plaster and masonry containing not more than 1% by weight or volume of organic material. (Use in buildings of combustible metals such as magnesium-aluminium alloys should be assessed in each individual case).