狠狠狠狼鲁欧美综合网_天堂av无码aⅴav在线_欧美日韩一区在线播放_久久久影院亚洲午夜 -国产精品专区第一页在线观看_春色校园亚洲愉拍自拍_精品国产自产在线观_午夜福利亚洲第一

The needle like powder is the best material for friction products. The special needle like structure made the silica fume instead of the expensive raw material, reducing the finished product, increasing the economic benefit, and the unique physical and mechanical properties of the products, which greatly enhanced the resistance and heat resistance of the finished product. Widely used in lining, brakes, clutch, valve plug, pulley, sandpaper etc..