Medium purity dense castables are suitable for use in medium temperature applications. This group of castable contain medium purity Calundum as the refractory binder. Depending on the type ofrefractory aggregates used in these castables, a series of FIRECRETE group of castable are manufactured. All these castables are used in oxidising atmospheres only. These refractory castables are hydraulic setting and can be cast or moulded to any shape, and can also be suitably modified for gunning of furnace linings.