日本色www_成人无码www免费视频嘿嘿软件_欧美四级在线观看_精品三级在线观看_成人国产精品入口免费视频_国产精品pans私拍

棕剛玉P砂是在棕剛玉F砂標準的基礎上，通過進一步分篩和水洗工藝處理后加工而成。
這種棕剛玉P砂不經過高溫緞燒，形狀是尖形，磨削力高，自銳性好，適用于做各種涂附磨具產品，比如砂紙，砂布，砂帶等
Brown Fused Alumina for coated abrasives is produced undre well water-washing and carefully sieving again on the basis of FEPA sandard.
This is the kind of non-calcined Brown Fused Aluminium Oxide grain for coated abrasives application, the grain shape is very sharp, high abrasive ability
and good self-sharpening. It is used for producing all kinds of coated abrasives products, such as sand paper, cloth, belts, and so on.