Black Silicon Carbide for Glass Drilling
Black silicon carbide (Black SiC) micropowder is produced by smelting quartz sand and petroleum coke in a resistance furnace, followed by crushing, shaping and air classification. With a Mohs hardness of 9.2–9.5, sharp grain shape and excellent self-sharpening property, it is widely used as loose abrasive for drilling hard and brittle glass materials, including flat glass, thick glass and quartz glass.
| Application | Recommended Grade | Features |
|---|---|---|
| Fast rough drilling | 400# 600# | High cutting efficiency; relatively rough hole wall, risk of minor chipping |
| General glass drilling (most popular) | 800# 1000# | Balanced efficiency and surface finish, preferred for ordinary flat glass |
| Precision drilling for thin / optical glass | 1500# 2500# | Fine hole surface, less edge chipping, slower machining speed |
| Fine hole finishing | 3000# 4000# | Ultra-smooth finish, minimal chipping |
Comparison with Other Abrasives
- vs White Alumina: Black SiC is harder and more self-sharpening, better cost performance for glass drilling. White alumina has higher toughness and lower grinding efficiency on glass.
- vs Green Silicon Carbide: Green SiC has higher purity and sharper grains for high-precision optical components, but it is more expensive. Black SiC is economical for common industrial glass.