79241838
Jun 6, 2018
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
Nonmetallic Building Materials