Classification Information
Bricks (refractory articles); refractory blocks for use as linings for furnaces; refractory products in the form of bricks; refractory cements; ceramic bricks for use in refractory furnaces; refractory linings for furnaces (not of metal); refractory mortars (not of metal); refractory molds (not of metal); semi-refractory bricks, not of metal; refractory materials, not of metal; refractory construction materials, not of metal; refractory bricks; refractory concretes; refractory materials for building (not of metal)
Nonmetallic Building Materials