1. Bata api SK 32
2. Bata api SK 34
3. Bata api SK 36
dengan spesifikasi sebagai berikut :
| SPESIFICATION | FIRE CLAY BRICK | HIGH ALUMINA BRICK | ||
| SK-32 | SK-34 | SK-36 | SK-38 | |
| Max. Service Temperature (deg C) | 1200 | 1400 | 1500 | 1600 |
| Bulk Density (gr/cm cubic) | 2.0-2.1 | 2.1-2.2 | 2.2-2.3 | 2.4 - 2.6 |
| Cemical composition (%) | ||||
| AL2 O3 | 32-35 | 40-45 | 55-60 | 70-80 |
| Si O2 | 50 | 45 | 35 | 25 |
| Fe2 O3 | max. 1 | max.1 | max. 0,5 | max. 0,5 |
| SPESIFICATION | FIRE CLAY BRICK | HIGH ALUMINA BRICK | ||
| T.F.B | T.H.B | HA-3 | HA-1 | |
| Max. Service Temperature (deg C) | 1600 | 1650 | 1700 | 1850 |
| Bulk Density (gr/cm cubic) | 2,5 | 2,7 | 3,2 | 3,8 |
| Cemical composition (%) | ||||
| AL2 O3 | 45 | 50 | 64 | 80 |
| Si O2 | 44-56 | 35-40 | 20-23 | 12 |
| Fe2 O3 | 1,6 | 1,5 | 1 | 0.5 |