Glass in balls (other than microspheres of heading 70.18), rods or tubes, unworked. - Tubes: - Of other glass having a linear coefficient of expansion not exceeding 5x10-6 per Kelvin within a temperature range of 0°C to 300°C

1. 1. This Chapter does not cover: • (a) Goods of heading 32.07 (for example, vitrifiable enamels and glazes, glass frit, other glass in the form of powder, granules or flakes); • (b) Articles of Chapter 71 (for example, imitation jewellery); • (c) Optical fibre cables of heading 85.44, electrical insulators (heading 85.46) or fittings of insulating material of heading 85.47; • (d) Front windscreens (windshields), rear windows and other windows, framed, for vehicles of Chapters 86 to 88; •...

2. 2. For the purpose of headings 70.03, 70.04 and 70.05: • (a) glass is not regarded as "worked" by reason of any process it has undergone before annealing; • (b) cutting to shape does not affect the classification of glass in sheets; • (c) the expression "absorbent or reflecting or non-reflecting layer" means a microscopically thin coating of metal or of a chemical compound (for example, metal oxide) which absorbs, for example, infra-red light or improves the reflecting qualities of the...

3. 3. The products referred to in heading 70.06 remain classified in that heading whether or not they have the character of articles.

4. 4. For the purpose of heading 70.19, the expression "glass wool" means: • (a) Mineral wools with a silica (SiO 2 ) content not less than 60% by weight; • (b) Mineral wools with a silica (SiO 2 ) content less than 60% but with an alkaline oxide (K 2 O or Na 2 O) content exceeding 5% by weight or a boric oxide (B 2 O 3 ) content exceeding 2% by weight. Mineral wools which do not comply with the above specifications fall in heading 68.06.

5. 5. Throughout the Nomenclature, the expression "glass" includes fused quartz and other fused silica.