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 7018), 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 5 x 10-6 per Kelvin within a temperature range of 0oC to 300oC 70 02 39 - - Other