[3807.00.00]

38.07 - Wood tar; wood tar oils; wood creosote; wood naphtha; vegetable pitch; brewers' pitch and similar preparations based on rosin, resin acids or on vegetable pitch. This heading covers products of complex composition obtained durin the distillation (or carbonisation) of resinous or non-resinous wood. Apart from gases, t ese processes give pyroligneous liquids, wood tar and wood charcoal in proportions varying according to the nature of the wood employed and the s eed of the operation. Pyroligneous liquids (sometimes known as raw pyroligneous acid), whic are not materials of international commerce, contain acetic acid, methanol, acetone, a little -aldehyde and ally1 alcohol. This heading also covers vegetable pitch of all kinds, brewers' pitch and similar compounds based on rosin, resin acids or on vegetable pitch. % ?I The products classified here are : (A) Wood tar; wood tar oils whether or not decreosoted and wood creosote. I (I) Wood tar is obtained by draining from wood coniferous or other) during carbonisation in charcoal kilns e.g., Swedish tar or Stoc olm tar), or by distillation in retorts or ovens (distilled tars). he latter are obtained directly as a fracbon settling out from the pyroli eous liquids (settled tars), or by distillation of the pyroligneous liquids - in whic they have been partially dissolved (dissolved tars). ?i r, Partially distilled tars from which some of the volatile oils have been removed by further distillation are also classified in this heading. All these tars are complex mixtures of hydrocarbons, phenols or their homologues, hfuraldehyde, acetic acid and various other products. Tars obtained from resinous woods, which differ from those obtained fiom non-resinous woods in that they also contain products resulting fiom the distillation of the resin (terpenes, rosin oils, etc.), are viscous y d u c t s r a n p g in colour fkom brownish-orange to brown. They are chiefly emp oyed (as o tamed, after simple dehydration or after partial distillation) for impregnating ships' cables, as plasticisers in the rubber industry, in the preparation of mastics, in medicine, etc. Tars obtained from non-resinous woods are thick brownish-black liquids mainly used for the preparation, by distillation or other means, of a wide range of by-products (wood creosote, guaiacol, etc.). Cade oil, also known as juniper tar oil, used in medicine and soap making, is also covered by this heading. (2) Wood tar oils are produced during the distillation of wood tar. The light oils (containing ali hatic hydrocarbons, te enes and higher ketones) are used for the manufacture o sheep dips and horticu tural sprays, and the heavy oils (containing aliphatic and aromat~chydrocarbons, higher ketones and higher phenols) serve for impregnating wood and for the extraction of wood creosote. F T' Decreosoted oils obtained after extraction of the creosote are used according to their characteristics for concentrating ores by flotation, for preparing fungicides, as solvents, as fuels, etc. (3) Wood creosote is an essential constituent of wood tar. It is usual1 obtained by distilling tar obtained fiom non-resinous woods, separating it fiom x e appropriate fraction with sodium hydroxide, re-acidification and re-distillation. It is a colourless liquid but takes on colour under the action of air and li t, has an odour of smoke, is caustic and is used in particular as a disinfectant an antiseptic. It should not be confused with creosote oil or mineral creosote which are classified in heading 27.07. ? (B) Wood naphtha is obtained by processing pyroli eous li uids. It is a ellowish li uid with an empyreumatic odour usually contamin to 90 !I'/a methanol &hyl alco 01) with varying pro oltions of acetone and other etones (generally 8 to 20 %), as well as other impurities frnethyl acetate, higher alcohols, tany substances, etc.). Certain types of wood naphtha are used as denaturants for ethanol. r% (C) Vegetable pitch. These are residues of the distillation or other treatment of vegetable materials. They include : (I) Wood pitch (wood tar pitch), a residue of the distillation of wood tar. (2) Rosin pitch, a residue of the preparation of rosin spirit and rosin oil by distillation of rosin. (3) Sulphate pitch, a residue after the distillation of tall oil, etc. These itches are usually blackish-brown, reddish-brown or yellowish-brown. They general y soften with the heat of the hand. The are used, according to their type, for caulking ships, waterproof-coating of woven ibrics, impregnating woods, preparing anti-rust coattngs, as binding materials, etc. f (D) Brewers' pitch and similar preparations based on rosin, resin acids or on vegetable pitch. (1) Brewers' pitch is used hot for coating beer-barrels. It is usually obtained by melting mixtures of rosin, paraffin wax and rosin oil, or mixtures of rosin and vegetable oils (such as linseed oil, cotton-seed oil or colza oil). (2) Cobblers' wax is used for waxing yarns and twine for sewing footwear and harness-makers' wares, and normally consists of a mixture of rosin, rosin oil, paraffin wax, ozokerite, etc., and contains powdered inor anic substances (such as talc or kaolin). It is usually in the form of blocks, sticks or fiscs. (3) Caulking pitch is used for caulking ships and is generally prepared by fbsing a mixture of wood pitch, wood tar and rosin. This heading does not cover : (a) Natural Burgundy pitch (also known as "Vosges pitch '3, a natural resin obtained from certain coniferous trees, and yellow pitch which is natural Burgundy pitch putified by fusion and filtering (heading 13.01). (b) Stearin pitch (stearic pitch), wool grease pitch and glycerol pitch (heading 15-22). (c) Mineral pitch from coal, peat, petroleum, etc. (Chapter 27). (d) Methanol (methyl alcohol), pure or commercially pure, or other se mate chemically defined products obtained by redistilling or further treating the prlmary products o wood distillation, e.g., acetic acid, acetone, guaiacol, formaldehyde, acetates, etc. (Chapter 29). P (e) Sealing wax (heading 32.14 or 34.04). ( f ) Residual lyes from the manufacture of wood puIp (heading 38.04). (g) " Brais rCsineux " (heading 38.06).