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.
Blast Furnace
| BF Stack Lining | A | B | C | D |
| Al2O3 % | 39 | 42 | 54 | 42 |
| B.D. (gm/cc) | 2.20 | 2.25 | N.A. | N.A. |
| A.P. % | 19 | 16 | 23 | 12 |
| CCS (kg/cm2) | 400 | 500 | 300 | 700 |
| RUL (ta °C) | 1450 | 1480 | 1480 | 1500 |
| PLC % | ±0.5 | ±0.3 | ±0.5 | ±0.2 |
| (at °C/2 hrs) | 1450 | 1500 | 1500 | 1450 |
| BF Bottom Lining | A | B | C |
| Al2O3 % | 62 | 63 | 62 |
| A.P. % | 15 | 15 | 15 |
| CCS (kg/cm2) | 600 | 600 | 600 |
| RUL (ta °C) 4kg/cm2 | 1500 | 1500 | 1500 |
| PLC % (at 1450°C/2 hrs) | ±0.2 | ±0.2 | ±0.2 |
| BF Tap hole | A | B |
| Al2O3 % | 72 | 70 |
| SiC % | N.A. | 13 |
| A.P. % | 17 | 14 |
| CCS (kg/cm2) | 500 | 80 |
| (at °C) | N.A. | 400 |
| RUL (ta °C) 4kg/cm2 | 1650 | N.A. |
| PLC % (at 1500°C/2 hrs) | ±0.5 | N.A. |
| BF Trough | A | B | C | D |
| Al2O3 % | 70 | 70 | 70 | 71-73 |
| SiC % | 10-15 | 22 | 15 | 18-20 |
| A.P. % | N.A. | 13.7 | N.A. | N.A. |
| B.D.(gm/cc) | 2.8 | 3.1 | 2.9 | 2.8 |
| (at °C/24 hrs) | 110 | 1000 | 110 | 1500 |
| CCS (kg/cm2) | 600 | 650 | 600 | 500 |
| (at °C/3 hrs) | 1400 | 1000 | 1450 | 1500 |
| PLC % | +0.50 | N.A. | +0.12 | +0.80 |
| (at °C/3 hrs) | 1400 | N.A. | 1100 | 1500 |
| MOR (kgcm2) (110°C/24 hrs) | 75 | 74 | N.A. | N.A. |
| Refractoriness (°C) | N.A. | 1650 | 1820 | 1700 |
| BF Stove Checker | A | B | C | D | E |
| Al2O3 % | 70 | 62 | 62 | 63 | 0.7 |
| SiO2 % | N.A. | N.A. | N.A. | N.A. | 95 |
| B.D. (gm/cc) | 2.55 | N.A. | N.A. | 2.47 | N.A. |
| A.P. % | 18 | 24 | 24 | 20 | 21 |
| CCS (kg/cm2) | 500 | 250 | 250 | 400 | 300 |
| RUL (2kg/cm2) (ta °C) | 1700 | 1450 | 1500 | N.A. | N.A. |
| PLC % | ±0.2 | ±0.4 | ±0.4 | ±0.2 | ±0.2 |
| (at 1500°C) | 4 hrs | 4 hrs | 4 hrs | 2 hrs | 2 hrs |
| Creep (N/mm2 at 1500°C/20-50hrs) | N.A. | N.A. | N.A. | 0.2 | 0.2 |
| Spalling at 1300°C (cycles) | N.A. | N.A. | 8 | N.A. | N.A. |
| Ceramic Burner Blocks | A | B |
| Al2O3 % | 53 | 64 |
| Fe2O3 % | 1.7 | 1.5 |
| B.D.(gm/cc) | 2.35 | 2.50 |
| A.P. % | 20 | 22 |
| CCS (2kg/cm2) | 40 | 45 |
| RUL (ta °C) | 1350 | 1450 |
| PLC % (at °C/2 hrs) | ±0.1 | ±0.1+0.2 |
| (at °C)/4 hrs | 1400 | 1500 |
| MOR at room temp (Nmm2) | 15 | 15 |
| Creep % (2kgcm2/20-50 hrs) | 0.2+0.03 | 0.2+0.03 |
| (at °C) | 1350 | 1500 |
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