refractory bubble alumina brick

Bubble alumina brick -major features 1. typical physical &chemicalproperties: item Bubble alumina brick BrandBA 85BA 90BA 99Service Temp. °C (max.)168017001800Al2O3 %≥85≥90≥99ZrO2 %SiO2 %≤15≤8≤0.2Fe2O3 %≤0.2≤0.2≤0.2Bulk density g/cm31.4-1.71.4-1.71.4-1.7CCS MPa≥12≥10≥9RUL °C≥1650 ≥1700≥1700(0.1MPa,0.6%)PLC %±0.3±0.3±0.3(1600°C×3h)Thermal expansion x10-6 7.8 8.0 8.6(room temp. to 1300°C)Thermal conductivity w/(m.k)≤0.8≤1.3≤1.5(Average temp. 800°C) 2. low conductivity - improved insulation effects and energy efficiency 3. high refractoriness - these bricks can directly contact with flame.