... -70,A4-30,A4-20 etc Use:thermal insulation,rubber,brake,textile etc asbestos Grade:A7-20,A6-40,A5-50 ... ,A5-60,A5-70,A4-30,A4-20 etc Use: ... 5-50,5-60,5-70,4-30,4-20,3-60Asbestos content≥ 98%MaterialMineral fiberFiber length0-14 ... conduction of electricity, Flame proof, Alkali proof. 3.Fiber is tough ,tensile and soft with better luster and ...