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.
| Mullite Bricks | A | B | C |
| Al2O3 % | 70 | 74 | 60 |
| Fe2O3 % | 0.5 | 0.5 | 2.0 |
| B.D. (gm/cc) | 2.55 | 2.60 | 2.50 |
| A.P. % | 18 | 17 | 20 |
| C.C.S. (kg/cm2) | 500 | 700 | 400 |
| RUL (ta °C) | 1700 | 1700 | 1550 |
| PLC % | ±0.2 | N.A. | 1.0 |
| at °C for hrs | 1500/2 | N.A. | 1400/5 |
| Zircon Bricks | A | B |
| SiO2 % | 0 | 33 |
| ZrO2 % | 63 | 60 |
| A.P. % | 20 | 19 |
| C.C.S. (kg/cm2) | 500 | 600 |
| RUL (ta °C) | 1600 | 1550 |
| Zircon Mullite Bricks | A | B |
| Al2O3 % | 70 | 68 |
| ZrO2 % | 17 | 18 |
| A.P. % | 17 | 21 |
| C.C.S. (kg/cm2) | 800 | 500 |
| RUL (ta °C) | 1650 | 1600 |
| Silica Bricks for Furnace Roof | A | B |
| SiO2 % | 96.2 | 95.3 |
| Fe2O3 % | 0.4 | 0.9 |
| Al2O3 % | 0.43 | 0.70 |
| CaO % | 2.5 | 2.5 |
| B.D. (gm/cc) | 1.82 | 1.80 |
| A.P. % | 21 | 22 |
| C.C.S. (kg/cm2) | 410 | 400 |
| RUL (2kg/cm2) | 1690 | 1670 |
| PLC % | 0.15 | 0.20 |
| at °C for hrs | 1450/2 | 1450/2 |
| Basic Bricks for Regenerators | A | B | C | D |
| MgO % | 88-90 | 94 | 97 | 64 |
| Cr2O3 % | 0 | 0 | 0 | 21 |
| Al2O3 % | N.A. | 0.3 | 0.2 | 5.0 |
| B.D. (gm/cc) | N.A. | 2.92 | 2.95 | 3.10 |
| A.P. % | 20 | 17 | 16 | 18 |
| C.C.S. (Kg/cm2) | 350 | 450 | 500 | 400 |
| RUL (ta °C) (2 kg/cm2) | 1550 | 1600 | 1750 | N.A. |
| PLC % | 0.5 | 0.5 | 0.5 | 0.3 |
| at °C for 2hrs | 1600 | 1600 | 1600 | 1700 |
| Fused-cast refractories for glass melting furnace | A | B | C |
| Al2O3 % | 49.0 | 49.1 | 46.8 |
| ZrO2 % | 34.8 | 37.3 | 41.0 |
| SiO2 % | 14.8 | 12.3 | 11 |
| BD (gm/cc) | 3.70 | 3.78 | 3.94 |
| AP % | 1 | 1 | 1 |
| MOR (kg/cm2) | 689 | 615 | 559 |
| Linear Thermal Expansion % (1100°C) | 0.83 | 0.90 | 0.89 |
| Thermal conductivity (K.cal/M.hr) (1000°C) | 2.4 | 2.5 | 2.7 |
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