[ (( [ Non-metallic minerals for building or construction; ceramic building materials in the nature of ceramic board and ceramic siding; ] bricks; refractory products not of metal, namely, ramming mixes, refractory castable mixes, fired refractory materials, ceramic shapes for use in refractory furnaces, refractory blocks, all not of metal [ ; boards and powders for building purposes made of inorganic non-asbestos fibers, namely, silicon carbide whiskers and silicon nitride whiskers ] )) ]

bricks; refractory products not of metal, namely, ramming mixes, refractory castable mixes, fired refractory materials, ceramic shapes for use in refractory furnaces, refractory blocks, all not of metal

Chemicals and chemical materials used in industry, science and agriculture, namely, [ magnesium hydroxide, ] magnesium oxide [, magnesium carbonate, calcium hydroxide, calcium oxide, calcium carbonate, zirconium oxide, calcium sulfite, calcium peroxide, silicon carbide, silicon nitride; chemicals used in deposition, namely, chemical source material for the deposition of thin films; magnesium oxide ceramics in particle and compacted form used as target material for sputtering, electron-beam d...