Other

68.14 - Worked mica and articles of mica, including agglomerated or reconstituted mica, whether or not on a support of paper, paperboard or other materials. 6814.10 - Plates, sheets and strips of agglomerated or reconstituted mica, whether or 6814.90 - Other not on a support This heading covers natural mica, further worked than merely rifted and trimmed (e.g., cut to shape), and also products consistin of agglomerated (bonded) mica or pulped (reconstituted) mica, and articles made from any o these materials. i: Thin sheets and splittings obtained by merely rifling and trimming mica books as mined fall in heading 25.25. The headin covers products obtained by cutting such sheets and splittings. Since they are obtained wifh a die-punch, their edges are clean cut. Natural mica is often used as such in the form of sheets or splittings. However, since the small size of the crystals and their poor flexibility, high cost, etc., render natural mica unsuitable for many uses, it is fre uently replaced by agglomerated (built-up) mica (e.g.,. micanite, micafolium), which is o7 3tained by bonding mica s littings one above the other or side b side using shellac, natural resins, plastics, asphalt, etc, gglomerated mica is niade in sheet, p ate or stri form, in all thicknesses, often with a fairly large surface area; the sheets, etc., are generally bac ed on one or (usually) both surfaces with textile fabric, glass fibre fabric, paper or asbestos. Y R I: Thin sheets of mica may also be obtained, without em loying a binding agent, by submitting powdered and pulped mca waste to a thermal, chemica and mechanical process similar to that used for making paper (reconstituted mica). P These thin sheets are then mounted on to a pa er or textile backin using a flexible bondin material; alternatively, they may be used fore!lt manufacture of p ates and strip of s ecifie thicknesses by superimposrng several thin sheets and bonding them with an organlc bin er. f t % sheets, strips and rolls in the length; pieces cut to shape for s ecial uses in (including squares), discs, etc.; moulded articles such as tu es, conduits, be coloured in the mass, painted, drilled, milled or otherwise worked. g Owin to its hi h resistance to heat and its relative translucency, mica is used, inter alia,for the manu acme o windows for ovens, stoves, furnaces, etc., of unbreakable lamp glasses ", and lasses " for goggles, etc. But mica is mainly used in the electrical industry because of its O ~ ' ' Plent dielectric pro erties (in the manufacture of motors, generators, transformers, exce capacitors, resistors, et$ It should, however, be noted that mica insulators and other mica insulating arts of electncal ap aratus, even unmounted, fall in headings 85.46 to 85.48, and that mica electric condensers &apacitors) fall in heading 85.32. f ! " This heading fbrther excludes : (a) Powdered mica and mica waste (heading 25.25). (b) Paper or paperboard coated with mica owder (heading 48.10, or 48.14), and woven fabrics coated with mica powder (beadin 59.07). d e s e products should not be confused wth agglomerated or reconstituted mica as descri ed above. % (c) Expanded vermiculite (heading 68.06) (see relative Explanatory Note). (d) Mica goggles and eyepieces therefor (heading 90.04). (e) Mica in the form of Christmas tree decorations (heading 95.05). -