Sell CN HCR Silica Bricks

Product Description                                         1. Product Details Silica brick is  the acid refractory ,which consist mainly of tridymite, cristobalite, and a small amount of residual quartz and glass phases. 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. 2.Features a.Good acid erosion resistanceb.Refractoriness 1690-1730°Cc.Higher refractoriness under load,above 1620-1680°Cd.Poor Thermal shock resistance,should not be used for the zone which temperature has rapid changee.Poor Volume stability at high temperature,must set aside appropriate expansion joint when laying brickf.True density is changed between 2.33-2.42g/cm3,the smaller, the better 3.Technical Data 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           Fe2O3  ≤1.5  ≤1.5  ≤1.0           CaO  ≤3     ≤2.5           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              Permanent linear change on reheating，% 1450℃×2h     +0.2