- 1. This chapter does not cover: - a. goods of heading (/headings/3207) (for example, vitrifiable enamels and glazes, glass frit, other glass in the form of powder, granules or flakes); - b. articles of Chapter (/chapters/71) (for example, imitation jewellery); - c. optical fibre cables of heading (/headings/8544), electrical insulators (heading (/headings/8546)) or fittings of insulating material of heading (/headings/8547); - d. front windscreens (windshields), rear windows and other windows, framed, for vehicles of Chapter (/chapters/86) to Chapter (/chapters/88); - e. front windscreens (windshields), rear windows and other windows, whether or not framed, incorporating heating devices or other electrical or electronic devices, for vehicles of Chapter (/chapters/86) to Chapter (/chapters/88); - f. optical fibres, optically worked optical elements, hypodermic syringes, artificial eyes, thermometers, barometers, hydrometers or other articles of Chapter (/chapters/90); - g. luminaires and lighting fittings, illuminated signs, illuminated nameplates or the like, having a permanently fixed light source, or parts thereof of heading (/headings/9405); - h. toys, games, sports requisites, Christmas tree ornaments or other articles of Chapter (/chapters/95) (excluding glass eyes without mechanisms for dolls or for other articles of Chapter (/chapters/95)); or - ij. buttons, fitted vacuum flasks, scent or similar sprays or other articles of Chapter (/chapters/96). 2. For the purposes of heading (/headings/7003), (/headings/7004) and (/headings/7005): - 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, 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 glass while still allowing it to retain a degree of transparency or translucency; or which prevents light from being reflected on the surface of the glass. 3. The products referred to in heading (/headings/7006) remain classified in that heading, whether or not they have the character of articles. 4. For the purposes of heading (/headings/7019), the expression 'glass wool' means: - a. mineral wools with a silica (SiO2) content not less than 60% by weight; - b. mineral wools with a silica (SiO2) content less than 60% but with an alkaline oxide (K2O or Na2O) content exceeding 5% by weight or a boric oxide (B2O3) content exceeding 2% by weight. Mineral wools which do not comply with the above specifications fall in heading (/headings/6806). 5. Throughout the classification, the expression 'glass' includes fused quartz and other fused silica. ### Subheading note 1. For the purposes of subheadings [7013 22](/subheadings/7013220000-80), [7013 33](/subheadings/7013330000-80), [7013 41](/subheadings/7013410000-80) and [7013 91](/subheadings/7013910000-80), the expression 'lead crystal' means only glass having a minimum lead monoxide (PbO) content by weight of 24%.