Sellstrom 25 oz Heavy duty vermiculite coated blanket is a specialized plain weave fiberglass fabric, coated with a state-of-the-art black vermiculite compound. This industry-strength vermiculite coating boasts advanced abrasion resistance, as well as increased resistance to high temperatures, making it an ideal choice for your crucial welding blanket and other thermal barrier needs. Technical Specifications: Color: Black; Weight: 25 oz/sy (847.6 g/sm) +- 10%; Thickness: 0.030 inches .762 mm) +- 10%; Tensile Strength: Warp: 400 lbs./inch (71.4 kg/cm, Fill: 200 lbs./inch (35.7 kg/cm; Tear Strength: Warp: 50 lbs. (22.7 kg), Fill: 25 lbs. (11.3 kg); Flame Resistance: Char Length: 1/8 inch max; Temperature Resistance Continuous – 1200 degree F (648.8 degree C), Intermittent – 1500 degree F (815.6 degree C); Materials: Fiberglass, Vermiculite Compound; Standards Compliance: Certified to meet ANSI/FM 4950.