4' x 6' Velvet Shield Welding Blanket For heavy duty welding - sparks, spatter, and light slag. Carbonized fiber is the softest and toughest welding protection ever. 16 oz. black carbonized fiber. Lightweight, soft, and flexible welding blanket, providing incredible ease of use while withstanding high heat. Protects against sparks, spatter, and light slag. Temperature rating: 1800Deg F. Weight: 16 oz./yd2. Thickness: 0.150-0.200. Not grommeted. Not recommended for stress relief. FM approved 316-4X6 Prop65 information pending -