| Chapter Code | Chapter Description |
|---|
| 690912 | CERAMIC WARES FOR LABORATORY, CHEMICAL OR OTHER TECHNICAL USES: ARTICLES HAVING A HARDNESS EQUIVALENT TO 9 OR MORE ON THE MOHS SCALE |
| 690919 | CERAMIC WARES FOR LABORATORY, CHEMICAL OR OTHER TECHNICAL USES: OTHER |
| 691010 | OF PORCELAIN OR CHINA |
| 700210 | BALLS |
| 700220 | RODS |
| 700231 | TUBES: OF FUSED QUARTZ OR OTHER FUSED SILICA |
| 700232 | TUBES: OF OTHER GLASS HAVING A LINEAR COEFFICIENT OF EXPANSION NOT EXCEEDING 5 X 10-6 PER KELVIN WITHIN A TEMPERATURE RANGE OF 0C TO 300C |
| 700239 | TUBES: OTHER |