High Purity Tabular Alumina Castable
Refratab 94 and Refratab 97 are very high purity White Tabular Alumina based castables meant for critical applications in fertilizer, refinery, petrochemical and steel industries. These castables can withstand service temperature upto 1850 C in carbon monoxide and hydrogen atmospheres.
These castables have high bulk density, high mechanical strength at all temperatures, excellent workability, good abrasion resistance, excellent resistance to thermal spalling and good volume stability.
Refratab 97L
A bubble Alunima based Insulating Castable, which is suitable for high temperature Application (upto 1800 C). This product has an extremely low level of impurity, high strength, low density and low thermal conductivity.
| BRANDS | Refratab - 94 | Refratab - 97 | Refratab � 97L |
| Chemical Analysis | |||
| Al2O3 % Min. | 94 | 96 | 94 |
| Fe2O3 % Max. | 0.3 | 0.3 | 0.3 |
| SiO2% | 0.3 | 0.3 | 0.3 |
| CaO% | 5.0 | 2.8 | 5.0 |
| Physical Properties | |||
| Service Temp. ˚C | 1800 | 1850 | 1800 |
| Bulk Density gms/cc | 2.80 | 2.90 | 1.65 |
| Water required for casting | 8.5 - 9.5 | 8.5 - 9.5 | 13 - 18 |
| Grain Size, mm | 5.00 | 5.00 | 6.00 |
| CCS Kgs/cm2 | |||
| At 110 ˚C/24 hrs. | 600 | 400 | 70 |
| At 800 ˚C/3 hrs. | 450 | 280 | 60 |
| At 1100 ˚C/3 hrs. | 400 | 250 | 40 |
| At 1550 ˚C/3 hrs. | 700 | 400 | 60 |
| Thermal Properties | |||
| PLC % after | |||
| Heating at 800˚C / 3hrs | � 0.2 | � 0.1 | |
| Heating at 1100˚C / 3hrs | � 0.2 | � 0.2 | +/- 0.2 |
| Heating at 1450˚C / 3hrs | � 0.5 | � 0.8 | +/- 1.0 |
| Thermal Conductivity | |||
| Kcal/m/hr/˚C at 400˚C HF | 1.37 | 1.40 | 0.96 |
| At 600 ˚C HF | 1.40 | 1.43 | 1.05 |
| At 800 ˚C HF | 1.42 | 1.46 | 1.15 |
