... . Product SpecificationcodeFY288FY266FY267materialBsalt fiberE-glassE-glassdiameter of the fiber(um)65.55.5tex (g/km)204 ... and filter bags, also used as electric insulation material, thermal insulation material, filler for electric cables, fire ... proof material, wicks, sealing material, winded electric heating wires, and heat elements. basalt fiber ...