Classification Information
Marble, cement, concrete, mortar, sandstone, plaster and gravel; terra cotta; refractory construction materials, not of metal; refractory cement ; refractory concrete ; refractory mortars; refractory stone; firebricks; fireclay sold in powdered form for use in the manufacture of furnaces and furnaces linings; refractory construction materials, not of metal for coating; coating for repairing blast furnaces; refractory construction materials, not of metal for caulking, coating for repairing furnaces; refractory construction materials, not of metal for furnaces and blast furnaces
Nonmetallic Building Materials