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standard by International Organization for Standardization, 04/01/1993
The principle of the method is supporting a dry specimen of the fabric on a vertical plate, igniting its raised surface near the top in a specified manner, timing the spread of flame downwards on the surface of the fabric to a reference line. Applies to fabrics having a raised fibre surface, i.e. a napped, pile, tufted, flocked or similar surface.