High-alumina Refractory Brick Bond with Phosphate for Cement Kiln   This product is designed only for cement kiln, can be used for cement rotation kilns’ transition zone, clinkering zone, cooling zone, cooling machine and its working layer.   Properties   INDEX ITEMS P PA First grade products Qualified products First grade products Qualified products Al2 O3 ,% ≥ 75 77 Fe2 O3,% ≤ 3.2 3.2 CaO,% = 0.6 0.6 C.C.Strength, MPa ≤ 70 60 75 65 Volume Density, kg/m 3 ≥ 2700 2650 2750 2700 Refractoriness under Load T 0.6 , ℃ ≥ 1350 1300 1450 1250 Refractoriness, ℃ ≥ 1780