Ceramic Vermiculite Cloth Vermiculite coated ceramic fiber cloth is a soft, flexible cloth made of ceramic fiber yarn reinforced by fiberglass or steel wire with Vermiculite coating. It is an ideal replacement for asbestos product used for thermal insulation and heat protection. Welding blankets are heat-resistant materials that can work as a shield to protect other materials against sparks and splatter. When doing welding work, it is important to protect yourself and your surrounding area.