SPECIFICATIONS OF REFRACTORY MATERIALS FROM IRMA MEMBERS
Some typical specifications of Indian refractories commonly used in the furnaces and kilns in steel, cement, non-ferrous metals and glass industries are given below. These are illustrative and do not cover the full range of products and some of the improved items which have been recently developed.
| Refractories for Cement plant Pre Heaters | A | B | C |
| Al2O3 % | 40 | 30 | 60 |
| Fe2O3 % | 2.5 | 3.0 | 2.5 |
| RUL (ta °C) | 1450 | 1350 | 1500 |
| CCS (kg/cm2) | 350 | 300 | 400 |
| AP % | 22 | 25 | 20 |
| Reheat linear change % | 0.8 | 1.0 | 0.5 |
| at °C for 2 hrs | 1450 | 1350 | 1450 |
| Spalling resistance at 1000°C air quenching (cycles) | 30 | 25 | 30 |
| Thermal conductivity at 700°C (K.Cal/M/hr/°C) | 1.2 | 1.0 | 1.4 |
| Refractories for Cement Rotary Kilns | A | B | C | D | E |
| Al2O3 % | 80 | 70 | 70 | 60 | 45 |
| Fe2O3 % | 2.0 | 2.5 | 1.8 | 2.5 | 2.5 |
| RUL (ta °C) | 1550 | 1500 | 1550 | 1480 | 1450 |
| CCS (kg/cm2) | 600-800 | 450-600 | 350 | 400 | N.A. |
| AP % | 20 | 23 | 23 | 24 | 24 |
| PLC % | 1.0 | 2.0 | 0.5 | 1.0 | 0.8 |
| at °C for 2 hrs | 1450 | 1450 | 1500 | 1450 | 1450 |
| Spalling resistance at 1000°C air quenching (cycles) | 30 | 30 | N.A. | 30 | 12 |
| Thermal conductivity at 700°C (K.Cal/M/hr/°C) | 1.9 | 1.6 | N.A. | 1.4 | 1.2 |
| Basic Refractories for Cement Rotary Kilns | A | B | C | D | E |
| MgO % | 72 | 63 | 60 | 60 | 60 |
| Cr2O3 % | 6 | 11 | 12 | 13 | 15 |
| AP % | 23 | 22 | 18 | 18 | 20 |
| CCS (kg/cm2) | 200 | 300 | 300 | 300 | 300 |
| RUL (ta °C) | 1500 | 1570 | 1650 | 1700 | 1650 |
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