| 501 / | HD | COMPOSITIONS: CERAMIC |
| 1 | DF | CERAMIC COMPOSITIONS {15} |
| 11 | DF | .~ Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions {11} |
| 14 | DF | .~.~ Enamels, glazes, or fusion seals (e.g., raw, fritted, or calcined ingredients) {4} |
| 21 | DF | .~.~.~ Chemically specified frit compositions {4} |
| 26 | | .~.~.~.~ Zinc containing |