JIS A 1323 Type B Passed No. 04A2169; (Product) Conforms to the Japan Fire Retardant Association of Flame Retardant Performance Test; Test No. CO050009; Thickness: Approx. 0.04 inch (1 mm); Made with single-sided silicone coating of flame resistant fibers; As welding spark cradle, flameproof cover, fireproof curtain, and curing sheet. This is a low-cost product that has passed the B-type. A dual-purpose type that repels sparks and nools (surface), adhesion (back). Does not contain harmful fibers such as asbestos or glass fibers that have skin irritation.