[Class : 19] Refractory Clay, Refractory Granulates, Refractory Aggregates, Refractory Sand, Refractory Bricks, Refractory Mortar, Refractory Cement, Refractory Roof Tiles, Refractory Ceramic Masses, Non Metallic Refractory Bricks, Non Metallic Refractory Tiles, Refractory Castable Mixes (Not Of Metal), Refractory Construction Materials (Not Of Metal), Firebricks / Refractory Bricks, Fireclay / Grog [Fired Refractory Material], Semi Refractory Bricks (Not Of Metal), Fired Refractory Materials (Not Of Metal), Refractory Products In The Form Of Cement, Refractory Ceramic Masses For Covering Metallurgical Melts, Fired Refractory Materials, Not Of Metal [Building Materials], Refractory Masses For The Manufacture Of Fire Proof Linings, Alumina Cement.