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.
| Low Cement Castables | A | B | C | D | E | F |
| Al2O3 % | 70 | 90 | 80 | 90 | 70 | 70 |
| SiC % | N.A. | N.A. | N.A. | N.A. | 15 | N.A. |
| Max service Temp. (°C) | 1650 | 1800 | N.A. | N.A. | N.A. | 1650 |
| Grading (mm) | 0-5 | 0-5 | N.A. | N.A. | N.A. | 0-5 |
| B.D.(gm/cc) | 2.80 | 2.90 | 2.93 | 3.02 | 2.90 | 2.65 |
| PLC % | ±0.50 | ±0.40 | -0.18 | ±0.20 | +0.12 | ±0.50 |
| (at °C/3 hrs) | 1400 | 1400 | N.A. | N.A. | 800 | 1450 |
| Refractoriness (°C) | N.A. | N.A. | 1820 | 1820 | 1820 | 1790 |
| CCS (kg/cm2) (at 110°C/24 hrs) | 700 | 1000 | 860 | 980 | 200 | 700 |
| MOR | N.A. | N.A. | 1200 | 1290 | 40 | N.A. |
| (at °C/3 hrs) | N.A. | N.A. | 1550 | 1550 | 800 | N.A. |
| Insulating Castables | A | B | C |
| Al2O3 % | 40 | 45 | 63 |
| SiO2 % | 42 | 42 | 26 |
| B.D. (kg/m3) | 1430 | 1600 | 1550 |
| PLC % (at 1100°C/3 hrs) | ±0.2 | ±0.2 | ±0.5 |
| Refractoriness (°C) | 1430 | 1430 | 1600 |
| CCS (kg/cm2) (at 110°C/24 hrs) | 100 | 180 | 140 |
| MOR (at 110°C/24 hrs) | 18 | 90 | 40 |
| Thermal conductivity (Kcal/m hr 500°C) | 0.42 | 0.44 | 0.42 |
| Insulating bricks | A | B | C |
| Al2O3 % | 40 | 70 | 72 |
| A.P. % | 60 | N.A. | N.A. |
| B.D. (gm/cc) | 1.10 | 1.20 | 1.35 |
| PLC % | ±1.0 | +0.8 | -0.5 |
| (at °C/5 hrs) | 1350 | 1600 | N.A. |
| (at°C/24 hrs) | N.A. | N.A. | 1450 |
| Refractoriness (°C) | 1400 | 1825 | N.A. |
| CCS (kg/cm2) (at 110°C/24 hrs) | 40 | 50 | 35 |
| Thermal conductivity (Kcal/m hr°C) | 0.35 | 0.42 | 0.64 |
| (at °C) | 500 | 500 | 1000 |
| Ceramic Fibre | A | B |
| Al2O3 % | 43-47 | 32-36 |
| SiO2 % | 53-57 | 44-48 |
| ZrO2 % | N.A. | 16.5-19.5 |
| Temp. Limit (°C) | 1260 | 1425 |
| Tensile strength (128kg/m3) (Kpa) | 30-60 | 30-60 |
| Linear shrinkage (%) | 2.4-3.2 | <3.5 |
| (at °C/24 hrs) | 1200 | 1400 |
| Sp.Heat capacity at 980°C (kj/kg°K) | 1.07 | 1.07 |
| Thermal conductivity at 800°C (W/mK) | 0.18 | 0.17 |
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