WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
29.03 - Halogenated derivatives of hydrocarbons. - Saturated chlorinated derivatives of acyclic hydrocarbons : 2903.11 - - Chloromethane (methyl chloride) and chloroethane (ethyl chloride) 2903.12 - - Dichloromethane (methylene chloride) 2903.13 - - Chloroform (trichloromethane) - - Carbon tetrachloride 2903.15 - - Ethylene dichloride (ISO) (1,2-dichloroethane) 2903.19 - - Other - Unsaturated chlorinated derivatives of acyclic hydrocarbons : 2903.21 - - Vinyl chloride (chloroethylene) 2903.22 - - Trichloroethylene 2903.23 - - Tetrachloroethylene(perchloroethylene) 2903.29 - - Other 2903.14 - Fluorinated, brominated or iodinated derivatives of acyclic hydrocarbons : 2903.3 1 2903.39 - - Ethylene dibromide (ISO) (1,2-dibromoethane) - - Other - Halogenated derivatives of acyclic hydrocarbons containing two or more different halogens : 2903.71 - - Chlorodifluoromethane 2903.72 - - Dichlorotrifluoroethanes 2903.73 - - Dichlorofluoroethanes 2903-74 - - Chlorodifluoroethanes - Dichloropentafluoropropanes 2903.76 - - Bromochlorodifluoromethane, 2903.75 - dibromotetrafluoroethanes bromotrifluoromethane and 2903.77 - - Other, perhalogenated only with fluorine and chlorine 2903.78 - - Other perhalogenated derivatives 2903.79 - - Other -Halogenated derivatives hydrocarbons : 2903.81 -- of cyclanic, cyclenic or cycloterpenic 1 2 3 4 5 6-Hexachlorocycbhexane (HCH (ISO)), including lindane (ISO, W" 2903.82 2903.89 - - Aldrin (ISO), chlordane (ISO) and heptachlor (ISO) - - Other - 2903.9 1 2903.92 Halogenated derivatives of aromatic hydrocarbons : - - Chlorobenzene, o-dichlorobenzene and p-dichlorobenzene - - Hexachlorobenzene ISO) and DDT (ISO) (clofenotane I (INN), 1,1,1- trichloro-2,2-bisb-ch oropheny1)ethane) 2903.99 - - Other These are com ounds obtained b the substitution in the structural formula of a hydrocarbon of one or more %alogen atoms ( uorine, chlorine, bromine, iodine) for an equal number of hydrogen atoms. X (A) SATURATED CHLORINATED DERIVATIVES OF ACYCLIC HYDROCARBONS (I) Chloromethane (methyl chloride). Colourless gas, usually presented liquefied in steel cylinders. Used as a refrigerant, as an anaesthetic and in organic synthesis. (2) Dichloromethane (methylene chloride). A toxic, colourless, volatile liquid; used in organic synthesis. (3) Chloroform (trichloromethane). A colourless volatile liquid, with a characteristic odour; used as an anaesthetic, as a solvent and in organic synthesis. (4) Carbon tetrachloride. Colourless liquid; used in fire-extinguishers, and as a solvent for sulphur, oils, fats, varnishes, petroleum, resins, etc. (5) Chloroethane (ethyl chloride). Gaseous, liquefied in special containers; used as an anaesthetic. (6) Ethylene dichloride (ISO) (1,2-dichloroethane). Toxic, colourless liquid; used as a solvent. (7) 1,2-Dichloropropane (pro ylene dichloride). Colourless, stable liquid. Chloroform-like odour. Used in organic syn esis, and as a solvent for fats, oils, waxes, gums and resins. & (8) Dichlorobutanes. This heading excludes : (a) Chloroparaffins if they are mixtures of chlorinated derivatives; solid chloroparafins having the character of artificial waxes are classified in heading 34.04, while liquid chloroparaffins are classified in heading 38.24. (b) Products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13. (B) UNSATURATED CHLORINATED DERIVATIVES OF ACYCLIC HI'DROCARBONS (1) Vinyl chloride (chloroethylene). Gas with an odour of chloroform; presented in Iiquid form in steel containers; used for the preparation of poly(viny1 chloride) of heading 39.04. (2) Trichloroethylene. Colourless liquid with an odour of chloroform; solvent for varnishes, oils and fats; used in organic synthesis. (3) Tetrachloroethylene (perchloroethylene);colourless liquid used as a dry-cleaning solvent. (4) Vinylidene chloride. (C) FLUORINATED, BROMTNATED OR IODINATED DERIVATIVES OF ACYClLIC HYDROCARBONS (1) Bromomethane (methyl bromide). Gaseous, liquefied in special containers; used in fireextinguishers and as a refrigerant. (2) Bromoethane ethyl bromide). Colourless liquid with an odour similar to that of chloroform; use in organic synthesis. (3) Bromoform. Colourless liquid with a charac:teristic odour; used as a sedative. (4) Allyl bromide. (5) Iodomethane (methyl iodide) and iodoethane (ethyl iodide). Liquids, used in organic synthesis. (6) Di-iodomethane (methylene iodide). (7) Iodoform. Yellow powder or yellow crystals with a characteristic odour; used in medicine as an antiseptic. (8) Allyl iodide (3-iodopropene). This headin excludes products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, o?heading 38.15. (D) HALOGENATED DEFUVATIVES OF ACYCLIC HYDROCARBONS CONTAINING TWO OR MORE DIFFERENT HALOGENS Trade in chlorodifluoromethane, dichlorotrifluoroethanes, dichlorofluoroethanes, chIorodiiuoroethanes, dichloropentafluoropropanes, bromochlorodifluoromethane, bromotrifluoromethane, dibrornotetrafluoroethanes, trichlorofluoromethane, dichlorodifluoromethane, trichlorotrifluoroethanes, dichlorotetrafluoroethanes and chloro entafluoroethane is controlled by the Montreal Protocol on Substances that Deplete the Ozone ayer E This headin excludes products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, ofheading 38.13. @) HALOGENATED DERIVATIVES OF CYCLANIC, CYCLENIC OR CYCLOTERPENIC HYDROCARBONS (1) 1,2,3,4,5,6-Hexachlorocyclohexane (HCH (ISO)), including lindane (ISO,INN). White or yellomsh powder or flakes; a very strong insecticide. (2) Halogenated derivatives of cyclopropane or cyclobutane. (3) Octachlorotetrahydro-4,7-endomethyleneindane,also a very strong insecticide. (4) Halogenated deriyftiyfs 5qf 'Y cage " structure hydrocarbons, such as dodecachloropentacyclo [5.2.1.0 ' .O ' .O ' ] decane. (5) Halogenated derivatives of cycloterpenes, such as chlorocamphene, bornyl chloride. (F) HALOGENATED DERIVATIVES OF AROMATIC HYDROCARBONS (1) Chlorobenzene. Inflammable liquid with a slightly aromatic odour; used in organic synthesis and also as a solvent for varnishes, resins and bitumens. (2) o-Dichlorobenzene, Colourless liquid. (3) m-Dichlorobenzene. Colourless liquid. (4) p-Dichlorobenzene. White crystals, used mainly as an insecticide, an air heshener or as an intermediate in the manufacture of dyes. (5) Hexachlorobenzene (ISO). White needles insoluble in water. (6) DDT (ISO) (clofenotane (INN), 1,l ,l-trichloro-2,2-bis(p-chlorophenylethane or dichlorodiphenyltrichloroethane).Colourless crystals or white to slightly off-w ite powder. Insecticide. (7) Benzyl chloride. Colourless liquid with an agreeable odour, highly lachrymatory; used in organic synthesis. (8) Monochloronaphthalenes, a (mobile liquid) or P (volatile crystals). They have an odour of naphthalene; used in organic synthesis, as plasticisers, etc. (9)) 1,4-Dichloronaphthalene, brilliant colourless crystals, and octachloronaphthalene, brilliant yellowish crystals, used as insecticides. Liquid polychloronaphthalenes are classified in this heading if they are not mixtures; but those in the solid state which are mixtures having the character of artificial waxes are excluded (heading 34.04). (10) Bromostyrene. This heading excludes polychlorobiphenylswhich are mixtures of chlorinated derivatives; those in the solid form having the character of artificial waxes fall in heading 34.04, and liquid polychlorobiphenyls are classified in heading 38.24.
1.- Except where the context otherwise requires, the headings of this Chapter apply only to : (a) Separate chemically defined organic compounds, whether or not containing impurities; (b) Mixtures of two or more isomers of the same organic compound (whether or not containing impurities), except mixtures of acyclic hydrocarbon isomers (other than stereoisomers), whether or not saturated (Chapter 27); (c) The products of headings 29.36 to 29.39 or the sugar ethers, sugar acetals and sugar esters, and their salts, of heading 29.40, or the products of heading 29.41, whether or not chemically defined; (d) The products mentioned in (a), (b) or (c) above dissolved in water; (e) The products mentioned in (a), (b) or (c) above dissolved in other solvents provided that the solution constitutes a normal and necessary method of putting up these products adopted solely for reasons of safety or for transport and that the solvent does not render the product particularly suitable for specific use rather than for general use; (f) The products mentioned in (a), (b), (c), (d) or (e) above with an added stabiliser (including an anti- caking agent) necessary for their preservation or transport; (g) The products mentioned in (a), (b), (c), (d), (e) or (f) above with an added anti-dusting agent or a colouring or odoriferous substance or an emetic added to facilitate their identification or for safety reasons, provided that the additions do not render the product particularly suitable for specific use rather than for general use; (h) The following products, diluted to standard strengths, for the production of azo dyes : diazonium salts, couplers used for these salts and diazotisable amines and their salts. 2.- This Chapter does not cover : (a) Goods of heading 15.04 or crude glycerol of heading 15.20; (b) Ethyl alcohol (heading 22.07 or 22.08); (c) Methane or propane (heading 27.11); (d) The compounds of carbon mentioned in Note 2 to Chapter 28; (e) Immunological products of heading 30.02; (f) Urea (heading 31.02 or 31.05); (g) Colouring matter of vegetable or animal origin (heading 32.03), synthetic organic colouring matter, synthetic organic products of a kind used as fluorescent brightening agents or as luminophores (heading 32.04) or dyes or other colouring matter put up in forms or packings for retail sale (heading 32.12); (h) Enzymes (heading 35.07); (ij) Metaldehyde, hexamethylenetetramine or similar substances, put up in forms (for example, tablets, sticks or similar forms) for use as fuels, or liquid or liquefied-gas fuels in containers of a kind used for filling or refilling cigarette or similar lighters and of a capacity not exceeding 300 cm3 (heading 36.06); (k) Products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13; ink removers put up in packings for retail sale, of heading 38.24; or (l) Optical elements, for example, of ethylenediamine tartrate (heading 90.01). 3.- Goods which could be included in two or more of the headings of this Chapter are to be classified in that one of those headings which occurs last in numerical order. 4.- In headings 29.04 to 29.06, 29.08 to 29.11 and 29.13 to 29.20, any reference to halogenated, sulphonated, nitrated or nitrosated derivatives includes a reference to compound derivatives, such as sulphohalogenated, nitrohalogenated, nitrosulphonated or nitrosulphohalogenated derivatives. Nitro or nitroso groups are not to be taken as “nitrogen-functions” for the purposes of heading 29.29. For the purposes of headings 29.11, 29.12, 29.14, 29.18 and 29.22, “oxygen function”, the characteristic organic oxygen-containing group of those respective headings, is restricted to the oxygen-functions referred to in headings 29.05 to 29.20.