refractory castable for high temperature application procurement of refractory castable for high temperature application , heading1 , refractory castable for high temperature application. 1. general properties [ 1.1 ] type - 90 % alumina dense castable [ 1.2 ] max. service temperature - 1750 deg.c [ 1.3 ] max. grain size - 5 mm [ 1.4 ] water required for casting - 7.5 - 8.5 % 2. chemical analysis [ 2.1 ] % of al2o3 - 90.00 % [ minimum ] [ 2.2 ] % of fe2o3 - 0.80 % [ maximum ] 3. physical properties [ 3.1 ] dry density after drying at 110 deg.c for 24 hrs - 2.75 gm / cc [ minimum ] [ 3.2 ] % retained on maximum size - 5 % [ maximum ] [ 3.3 ] cold crushing strength - 400 kg / cm2 [ minimum ] 4. thermal properties [ 4.1 ] refractoriness - 37 [ minimum ] [ 4.2 ] permanent linear change after heating at 1550 deg.c for 3 hrs - + / - 1.00 [ max ] . tests / inspections required for castables date of manufacturing, date of expiry and shell life should be indicated on packet item code:421023005