Refractory materials, plastic (mouldable), Plastic products, Chemicals, Pharmaceuticals & Plastics, Plastic products, insulating, Refractory materials, alumina rich clay based, 45 to 85% aluminium oxide, Glass, cement and ceramics, Minerals, Refractory materials and their non-shaped products, Refractory materials and their non-shaped products by use, Refractory cements