Section 13 Articles of stone, plaster, cement, asbestos, mica or similar materials; ceramic products; glass and glassware 70 Glass and glassware 70 02 Glass in balls (other than microspheres of heading 70.18), rods or tubes, unworked. Commodity Code Description 70 02 10 Balls 70 02 20 Rods 70 02 31 Of fused quartz or other fused silica 70 02 32 Of other glass having a linear coefficient of expansion not exceeding 5X10-6..., 70 02 39 Other