1. Brown corundum abrasive, ti o ni akọkọ ti Al2O3, ni líle alabọde, lile nla, awọn patikulu didasilẹ ati owo kekere, ati pe o dara fun sisẹ awọn irin pẹlu agbara fifẹ giga.Mejeeji microcrystalline corundum abrasive ati corundum abrasive dudu jẹ awọn itọsẹ rẹ.Corundum funfun Whit...
Ka siwaju