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BS476 Class O is a classification system used in the UK to assess the fire performance of building materials and products. It specifically indicates that materials have a low contribution to fire spread and combustion. Class O is often required for materials used in the construction of walls, ceilings, and other surfaces in buildings, particularly in public and high-rise structures, to enhance safety and reduce fire risk. The classification is based on the performance of materials in standardized fire tests outlined in the BS476 standards.

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