Product Description
Silica brick is the acid refractory ,which consist mainly of tridymite, cristobalite, and a small amount of residual quartz and glass ses.
The silica content is 94% or more. It has acid slag corrosion resistance and higher high temperature strength. The load softening start temperature is 1620~1670 °C. Long-term use at high temperatures does not deform. The thermal shock stability is low (heat exchange in water for 1~4 times). This residual expansion will make the joints tight and ensure good air tightness and structural strength of the masonry.
Name
Item | Silica brick for coke oven G-D | Silica brick for hot blast stoves RG-94 | Silica brick for glass furnace BG-95 | Normal Silica brick | |||
GZ-95 | GZ-94 | GZ-93 | |||||
Chemical Competent % | SiO2 | ≥93 | ≥94 | ≥95 | ≥95 | ≥94 | ≥93 |
Al2O3 | ≤1.5 | ≤1.0 | ≤1.0 |
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Fe2O3 | ≤1.5 | ≤1.5 | ≤1.0 |
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CaO | ≤3 |
| ≤2.5 |
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True density，g/cm3 | ≤2.34 | ≤2.34 | ≤2.34 | ≤2.37 | ≤2.38 | ≤2.40 | |
Apparent porosity, % | ≤22 | ≤22 | ≤22 | ≤22 | ≤23 | ≤25 | |
Cold crushing strength, Mpa | ≥35 | ≥35 | ≥35 | ≥30 | ≥25 | ≥20 | |
Refractoriness ℃ | ≥1690 | ≥1710 | ≥1710 | ≥1710 | ≥1710 | ≥1690 | |
Initial soften point under load（℃）2MPa×0.6% | 1650 | ≥1650 | 1650 | ≥1650 | ≥1640 | ≥1620 | |
Creep rate（%） 2MPa·1550℃×2h |
| ≤1 |
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Permanent ange on reheating，% 1450℃×2h |
| +0.2 |
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