clay brick 1, good quality, reasonable price clay brick 2,low porosity 3,normal and high temperature strength clay bicks used in blast furnaceItems Index ZGN-42 GN-42Al2O3 ≥42 42Fe2O3 ≤1.6 1.7Refractoriness ≥1750 1750refractoriness under load of 0.2MPa ≥1450 14301450,3h 0 0 -0.2 -0.3Apparent porosity ≤15 16 Cold crushing strength /MPa ≥58.8 49.0 37 holes clay bricks