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This heading is restricted to drawn glass and blown glass which must be unworked and in sheets (whether or not cut to shape).
The non-mechanical blowing process, now more or less completely discarded (except for certain special types of glass), has been replaced by various mechanical processes consisting essentially of drawing (e.g., the Fourcault, Libbey-Owens or Pittsburgh processes) or of drawing combined with blowing.
The glass of this heading may be of various thicknesses but, in general, is less thick than cast glass of heading 70.03. It may be coloured or opacified in the mass, or flashed with glass of another colour during manufacture or may be coated with an absorbent, reflecting or non-reflecting layer.
Drawn glass and blown glass are frequently used in the form in which they are originally produced, without any further working. In addition to their main use as glass for windows, doors, display cases, greenhouses, clocks, pictures, etc., these types of glass are also used as parts of articles of furniture, for photographic plates, plain spectacle glass, etc.
The heading excludes drawn glass and blown glass which have been surface ground, polished or otherwise worked (see the Explanatory Notes to headings 70.05, 70.06, 70.09, etc.).
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