Section 13 ARTICLES OF STONE, PLASTER,CEMENT,ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE 68 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIALS 68 06 OR OF CHAPTER 69. 68 06 20 EXFOLIATED VERMICULITE, EXPANDED CLAYS, FOAMED SLAG & SIMILAR EXPANDED.... Commodity Code Description 68 06 20 00 EXFOLIATED VERMICULITE, EXPANDED CLAYS, FOAMED SLAG & SIMILAR EXPANDED....