This heading covers articles of stone or of other mineral substances, not covered by the earlier headings of this Chapter and not included elsewhere in the Nomenclature; it therefore excludes, for example, ceramic products of Chapter 69.
The heading covers, inter alia :(1) Non-electrical articles of natural or artificial graphite (including nuclear grade), or other carbons for example : filters; discs; bearings; tubes and sheaths; worked bricks and tiles; moulds for the manufacture of small articles of delicate design (e.g., coins, medals, lead soldiers for collections). (2) Carbon fibres and articles of carbon fibres. Carbon fibres are commonly produced by carbonising organic polymers in filamentary forms. The products are used, for example, for reinforcement. (3) Articles made of peat (for example, sheets, cylinder shells, pots for raising plants). Textile articles of peat fibre are, however, excluded (Section XI). (4) Unfired bricks made of dolomite agglomerated with tar. (5) Bricks and other shapes (in particular magnesite or chrome-magnesite products), chemically bonded but not yet fired. These articles are fired during the first heating of the furnace in which they are installed. Similar products presented after firing are excluded (heading 69.02 or 69.03). (6) Unfired silica or alumina vats (e.g., as used for melting glass). (7) Touchstones for testing precious metal; these may be of natural stone (e.g., lydite, a hard, fine-grained dark stone resistant to acids). (8) Paving blocks and slabs obtained by moulding fused slag without a binder, but excluding those having the character of heat-insulating goods of heading 68.06. (9) Filter tubes of finely crushed and agglomerated quartz or flint. (10)Blocks, slabs, sheets and other articles of fused basalt; these are used, because of their great resistance to wear, as linings for pipes, belt-conveyors, chutes for coke, coal, ores, gravel, stone, etc.
The heading also excludes : (a) Blocks, plates and similar semi-manufactures of artificial graphite or of other carbon , mainly used for cutting into electrical brushes (heading 38.01) (see corresponding Explanatory Note). (b) Refractory goods, fired as ceramics, with a basis of carbonaceous substances (graphite, coke, etc.) and coal tar pitch or clay (heading 69.02 or 69.03, as the case may be). (c) Carbons, brushes, electrodes and other parts or articles for electrical uses (heading 85.45).
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