... resistance, if use since the mill processing broken, grain much for spherical particles, the surface dry ... the single particle size density. Grain density for: 3.95 ~ 4.0 g/cm3, in recent ... material % SiO2abrasiveAbrasive add # - 80 # 99.4 or 0.4-0.03 or less or less90 #, 150 # ... tombstone, ceramics, wood, bamboo piece of etching artists. 4, pretreatment processing: TEFLON (TEFLON), PU, rubber, plastic ...