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30% Alumina Refractory Fire Brick Kit 2426°F of 6 Replacements for Stoves, fire pits and Pizza Ovens 9" x 4.5" x 1.25" Refractory Fire Brick is high temperature pre-shaped block which is applicable for any kind heat insulation like, lining of furnaces, Kilns, firebox, fireplaces, pizza oven, forge & stoves etc. As characteristics it has Low Thermal Conductivity, Good Mechanical Strength, High Compressive Strength, and Chemical Resistance & High Density. Specification Physical Properties Material : Refractory Fire Brick Type : 30% Alumina Fire Brick Service Temperature : 2426°F/1330°C Bulk Density : 1.9 Gm per cc /1900 kg per m³ Cold Crushing Strength : 250 kg per cm² min Apparent Porosity : 25% max Chemical Properties Al2O3 % min : 30 Fe2O3 % min : 2.90