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, rods or tubes, unworked 70 02 32 Tubes of other glass with a lce =<5x10-6/k, unworked Commodity Code Description 70 02 32 00 Tubes of other glass with a lce =<5x10-6/k, unworked 70 02 32 10 Of a kind used to manufacture vacuum tubes 70 02 32 30 Borosilicate glass tubes of a kind used to manufacture phial / ampoules 70 02 32 40 Other, of clear neutral borosilicate glass, with a diameter of 3 mm or more but not m 70 02 32 90 Other