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 (excl. microspheres of 70.18), rods or tubes, unworked 70 02 31 Of fused quartz or fused silica Commodity Code Description 70 02 31 00 Of fused quartz or fused silica