| Chapter Code | Chapter Description |
|---|
| 25280020 | NATURAL BORIC ACID CONTAINING NOT MORE THAN 85% OF H3BO3 (CALCULATED ON THE DRY WEIGHT) |
| 25280030 | NATURAL CALCIUM BORATES AND CONCENTRATES THEREOF (WHETHER OR NOT CALCINED) |
| 25291010 | LUMPS |
| 25301010 | VERMICULITE |
| 25301020 | PERLITE |
| 25301090 | OTHERS (INCLUDING POWDER) |
| 25309010 | MEERSCHAUM (WHETHER OR NOT IN POLISHED PIECES) AND AMBER AGGLOMERATED; MEERACHAUM AND AGGLOMERATED AMBER IN PLATES, RODS, ETC. NOT WORKED AFTER MOULDING JET |
| 25309020 | NATURAL ARSENIC SULPHIDES (SUCH AS ORPIMENT) |