Ultra clear glass

70.05 - Float lass and surface ground or polished glass, in sheets, whether or not having an absor ent, reflecting or non-reflecting layer, but not otherwise worked. % - Non-wired glass, having an absorbent, reflecting ox non-reflecting layer - Other non-wired glass : 7005.21 - - Coloured throughout the mass (body tinted), opacified, flashed or merely 7005.10 surface ground - - Other 7005.30 - Wired glass 7005.29 This heading covers float glass in sheets. Its raw materials are melted in a furnace. The molten glass leaves the firrnace and is fed on to a float bath of molten metal. On the float bath, the glass ac uires the flatness of a li uid pool and later retains the smooth finish of liquid surfaces. Be ore it reaches the end of e bath, it is cooled to a temperature at which it is hard enough to be passed over rollers without being marked or distorted. From the float bath the glass moves through an annealin lehr, at the end of which it is cooled and can be cut. This glass is not surface ground or *oEshed : it is perfectly flat as a result of the manufacturing process. 9. 'Ile heading also covers the types of glass of headings 70.03 and 70.04, which have been surface ground or polished (usually the two processes are combined). In the surface grinding process the lass is subjected to the action of rotating iron-shod discs which, in conjunction with a flow o water containing abrasives, wears the glass surface down to smoothness. Transparency is achieved by polishing in a machine with felt-covered discs impregnated with rouge (iron oxide Surface grindin can be continuous and twin-grinding machines are capable of working bo surfaces of the g ass simultaneously. A final pohshing is sometimes done. f 3; f The glass of this heading ma be coloured or opacified in the mass, or flashed with glass of another colour during manu acture or may be coated with an absorbent, reflecting or nonreflecting layer. f' Glass of this heading is frequently used in windows and doors, motor cars, ships, aircraft, etc., for the manufacture of mirrors, table and desk tops, shelves, display cases, etc., and in the manufacture of safety glass of heading 70.07. GIass in sheets which has undergone working not provided for in the heading text or in Note 2 (b) to this Chapter, including bent or curved glass, is excluded (headings 70.06,70.07,70.09, etc.). 70.06- Glass of heading 70.03, 70.04 or 70.05, bent, edgeworked, engraved, drilled, enamelled or otherwise worked, but not framed or fitted with other materials. This heading covers glass of the types referred to in headings 70.03 to 70.05 which has been sub'ected to one or more of the processes mentioned below. The heading does not, however, inc ude safety lass (heading 70.07), multi le-walled insulating units of glass (heading 70.08) or glass in the o m of mirrors (heading 70. 9). ! ? g The heading includes : (A) Bent or curved glass such as the special glass (e. for display windows) which is obtained by hot-bending or hot-curvin in a suitable k c e and over moulds) flat glass sheets, with the exception, however, o e bent or curved glass of heading 70.15. ~6 (B) Glass with worked edges (ground, polished rounded, notched, chamfered, bevelled, rofiled, etc.), thus ac uiring the character of articles such as slabs for table-tops, for lalances or other weig ing machinery, for observation slits and the like, for signs of various kinds, fingerplates, glasses for photograph frames, etc., window panes, glass fronts for fimiture, etc. (C) Glass perforated or fluted as a subsequent operation, etc. transparencies, etc.) so as to constitute 'f This heading covers not only flat glass in the form of semi-finished roducts e.g., sheets without any articular purpose), but also articles of flat lass designed or a speci ic purpose, subject to eir being neither fiamed, backed, nor fine with material other than lass. The headin thus includes, inter alia, fingerplates (for doors or switches) made entirely o$ bevelled or pe orated glass and sign-plates, even when bevelled, coloured or bearing designs or other decorations. tR P % R furniture. Gl'ass plates for articles of fiuniture, not framed or mounted in other materials, remain classified in this headin if presented separately, but are classified with the articles of furniture if they are presented at e same time (whether or not assembled) and clearly intended for incorporation therein. f P h o t o ~ ahic glass plates (sensitised, ex osed or developed) fall in Cha ter 37. Glass plates bearing elshlcs circuits consisting of impresse$ conductive metallic astes, an heating glass plates bearing metallised strips or designs acting as electrical resistances fall in hapter 85. P