This heading covers a range of glass articles obtained by pressing or moulding (whether or not combined with blowing); they are chiefly used for covering roofs, cupolas or archways, but are also used, usually in conjunction with concrete, for slabbing the lining walls of cellars, basements, underground corridors, etc.
The heading thus includes solid or hollow bricks, squares, tiles, slabs and various mouldings (double-headed, etc.). The heading also includes architectural ornaments (rosettes, king-posts, etc.), steps and risers, banister knobs, etc. These articles, which are of different degrees of translucency, may have their edges worked or grooved, and may be patterned, wired or combined with metal, concrete or other materials. The heading further includes :(1) Mosaic cubes, generally coloured or with one surface gilded, and small glass rectangles and other flat shapes, whether or not silvered, used as a facing material for walls, furniture, etc. These articles remain classified here, whether or not on a paper, paperboard, textile fabric or other backing. The heading also includes small coloured glass fragments or chippings, usually of opal glass, which are inlaid in cement to produce ornamental designs on the facades of buildings. (2) Leaded lights for private houses, stained glass windows for churches, etc. These consist of panels, rosettes, etc., formed of glass (usually coloured in the mass, surface-coloured or made of antique glass) of all shapes, embedded in lead cames, and sometimes reinforced with metal rods. Similar assemblies are made with the cames of other metals, particularly copperlight glazing, to make them more fire resistant. (3) Multicellular or foam glass in blocks, panels, plates, shells or similar forms, usually obtained from molten glass into which compressed air is blown or gassing agents are introduced. This gives colourless or coloured glass with a structure akin to that of pumice-stone; it has a specific gravity not exceeding 0.5 (hence its use as a substitute for cork), and is easily drilled, sawn, filed, etc. It is a heat- and sound-insulating and sound-absorbing material, used, in the forms mentioned above, in building, etc. This glass is also used for the manufacture of life-belts, life-buoys, ornaments, etc. In such forms, it is excluded from this heading and classified in the headings applicable to similar articles of other kinds of glass (more particularly, heading 70.13, 70.17 or 70.20). The heading also excludes : (a) Glass of headings 70.04 to 70.06. (b) Multiple-walled insulating glass (heading 70.08). (c) Finished panels and other decorative motifs made from mosaic cubes (heading 70.20). (d) Leaded lights of an age exceeding 100 years (heading 97.06).
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