| Feature: | Long Time Materials |
|---|---|
| Refractoriness (℃): | 1580< Refractoriness< 1770 |
| Shape: | Brick |
|
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| Classification | Sk 30 | Sk32 | Sk34 | K43 | |
| Properties | Medium-duty fireclay brick | High-duty fireclay brick | Super-duty fireclay brick | Super-duty fireclay brick | |
| Physical properties | Pyrometric cone equivalent | 29-30 Orton cone | 31-32 Orton cone | 33-34 Orton cone | 33-34 Orton cone |
| Refractoriess | 1670ºC | 1715ºC | 1760ºC | 1760ºC | |
| Bulk density | 2140-2150kg/m³ | 2200-2250kg/m³ | 2235-2250kg/m³ | 2275-2285kg/m³ | |
| Apparent porosity | 19.0-20.0% | 18.0-19.0% | 17.0-18.0% | 17.0-18.0% | |
| Cold crushing strength | 220-250kg/cm² | 220-320kg/cm² | 300-350kg/cm² | 350-400kg/cm² | |
| Modulus of rupture | 55-70kg/cm² | 55-70kg/cm² | 60-80kg/cm² | 80-90kg/cm² | |
| Reheat test, permanent linear chang After heating at 1400ºC | 0.0-0.06% | 0.0-0.2% | -0.18% | -0.50% | |
| Thermal expansion | At 800ºC | 0.55% | 0.50% | 0.50% | 0.55% |
| At 1000ºC | 0.60% | 0.60% | 0.60% | 0.60% | |
| At 1200ºC | 0.70% | 0.70% | 0.70% | 0.65% | |
| At 1400ºC | 0.71% | 0.72% | 0.75% | 0.70% | |
| Chemical composition: (approximate) | Silica(SiO2) | 64.10% | 57.80% | 52.40% | 49.00% |
| Alumina(Al2O3) | 31.80% | 36.20% | 44.10% | 45.80% | |
| Iron Oxide(Fe2O3) | 1.90% | 1.40% | 1.40% | 1.30% | |
| Calcium Oxide(CaO) | 0.40% | 0.50% | 0.40% | 0.40% | |
| Alkalines (Na2O+K2O+Li2O) | 0.50% | 0.50% | 0.50% | 0.50% | |
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