High Alumina Refractory Mortar (Dry Powder) We supply various grades of refractory mortars with low, medium and high alumina contents. We also offer high purity refractory mortars with very low iron content for critical applications. “RJ International” refractory mortar enjoys goodwill of being the best bonding mortar. It is packed in our double laminated paper bags and also has thick liner inside. Our refractory mortar is mainly used for bedding and joining of firebricks. The setting times are taken care of, so as to maintain a perfect balance in “ease of application” and “minimum.