Specification: Sticks and Stones Fibre Construction: 100% Polypropylene Colour Fastness: Light (BS EN ISO 105:B02): 6 Colour Fastness: Wet Rubbing (BS EN ISO 105: B01): 4-5 Colour Fastness: Dry Rubbing (BS EN ISO 105: X12): 4-5 Flammability (BS6307) Methanamine Pill Test: Pass Formats Tile Backing Bitumen Size 50 x 50cm Weight 4,937gsm Thickness 12.00mm