... wafer and crystal glass.We are the unique expert manufacturer of large specification polishing pad in China. At present, the ... substrate glass etc.(2).LDU yellowIt is made of pure polyurethane, no abrasive material content, it is more rigid than LD66/77, mainly ... contain zirconia abrasive, usually be used to polish the surfaces of high hardness products. 4.Specification(mm): Sizes1400×580,1400×640 ...