ALUMINUM 356 is a heat treatable aluminum casting alloy recommended for high strength, pressure-tight castings, and intricate shapes. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fatigue. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: Al-21. Producer or source: Aluminum Company of America.