 
			| Meterial | BC ( Boron carbide ceramics ) | 
|---|---|
| Purity | >99.9% | 
| Density (g/cm3) | 2.52 g/㎠ | 
| Flexural Strength (Mpa) | >400~650 Mpa | 
| Hardness (kg/mm2) | >3500 | 
| Resistivity (Ohm·㎝) | <0.5 | 
| coefficient of expansion (x10-6/℃) | 4.5 | 
| Product Name | Ring | SHOWER HEAD | 
|---|---|---|
| Meterial | BC ( Boron carbide ceramics ) | |
| Purity(%) | > 99.9 % | |
| Applications | Dry etcher process | |
| Out Dia | 360mm | |
| Thickness (Flatness) | 20mm | |
| Res. ( Ω.㎝ ) | Diameter 0.3~0.7mm | |
| Roundness < 0.05mm | ||
| Concentricity < 0.05mm | ||
| Δ XY-Position < 0.05mm | ||
| Surface Condition | Grinding | |
| Quality ( Visual ) | Chipping | |
| Scratch | ||
| Crack | ||
| Stain Free | ||
| Quality ( Cleaning Process ) | 원소 당 100ppb 이하 ( Na, Mg, Al, K, Ca, Cr, Fe, Ni, Cu, Zn, Y ) | |