Section 13 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIAL S; CERAMIC PRODUCTS; GLASS AND GLASSWARE 68 Articles of stone, plaster, cement, asbestos, mica or similar materials 68 13 Friction material and articles thereof (for example, sheets, rolls, strips, segm Commodity Code Description 68 13 20 68 13 81 68 13 89