Non-metal unshaped refractory products consisting of magnesia, magnesia-chromium, chromium-magnesia, magnesia-spinel, magnesia-carbon, namely refractory mortars, ramming mixes, gunning mixes and filling mixes; Fired and unfired basic non-metal shaped refractory products in the nature of mortars, concrete, and non-metal bricks, consisting of magnesia, magnesia-chromium, chromium-magnesia, magnesia-spinel, magnesia-carbon

Non-metal unshaped refractory products consisting of magnesia, magnesia-chromium, chromium-magnesia, magnesia-spinel, magnesia-carbon, namely refractory mortars, ramming mixes, gunning mixes and filling mixes; Fired and unfired basic non-metal shaped refractory products in the nature of mortars, concrete, and non-metal bricks, consisting of magnesia, magnesia-chromium, chromium-magnesia, magnesia-spinel, magnesia-carbon

Non-metal granulous refractory construction materials comprised of dead burned and calcined magnesia; fired and unfired basic refractory bricks of magnesia, magnesia-chrome, magnesia-spinel, magnesia-carbon; and refractory mortars

non-metal granulous refractory construction materials comprised of dead burned and calcined magnesia; fired and unfired basic refractory bricks of magnesia, magnesia-chrome, magnesia-spinel, magnesia-carbon; and refractory mortars