... electric resistance furnace from quartz sand ,petroleum coke and anthracite at high temperature.2. Applications:♦ Low ... , dry grinding, free grinding as well as cutting and making jewelry, jade, agate. ♦ Grinding of gray ... brass, ore, bone, glass, leather, rubber, plastic and the thermal sensitive material.3. Partical size,Black silicon ... - P150 P180 - P220 P240# - 1200# 98.5 98.0 97.0 92.0 0.20 0.30 0.30 ...