The Black Stallion B-VCF25 25 oz. Vermiculite Coated Fiberglass gives direct flame resitance, protecting your floor and delicate machinery. Vermiculite coating offers improved resistance to direct flame; heat travels across the fabric, not through it. Black 25 oz. vermiculite coated fiberglass has a 1,200°F melting temperature and this blanket is .054" thick. Finished blankets include grommets on all sides. This makes the B-VCF25 for HEAVY DUTY applications: heavy sparks, spatter, and slag.