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High Refractoriness 1400C 1520C Silica Insulating Brick Item GGR-1.0 GGR-1.10 GGR-1.5 GR-1.2 SiO2 % ≥91 ≥91 ≥91 ≥91 Bulk Density ( g/cm3) ≤1 ≤1.1 ≤1.15 ≤1.2 Cold Crushing Strength (MPa) ≥2 ≥3 ≥5 ≥5 ...