Refractory shapes, not of metal, namely, crucibles, muffles, bricks, tubes, sleeves, plates, guides, and rigid glass pipes

Fused silica as a grain or powder for use in the forming and manufacture of refractory crucibles, muffles, bricks, tubes, sleeves, plates, guides, and non-metallic rigid glass pipes

CHEMICAL COMPOSITIONS FOR WELDING CERAMIC OR REFRACTORY STRUCTURES AND ARTICLES

SILICA REFRACTORIES SUCH AS DRY GRAIN, DRY AND WET CEMENTS, SLIP CAST ARTICLES, FOAM BLOCKS AND THE LIKE, FORUSE WHERE RESISTANCE TO HIGH TEMPERATURE IS DESIRED

PYROMETER TUBES, MUFFLES