Harmonized System

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Section V > Chapter 25 > Heading 2530

Explanatory notes

… and chlorites, unexpanded 2530.20 ‑ Kieserite, epsomite (natural magnesium sulphates) 2530.90 ‑ Other (A) EARTH COLOURS, WHETHER OR NOT CALCINED OR MIXED TOGETHER; NATURAL … other ores used solely or principally for the extraction of uranium or thorium ( heading 26.12 ). (11) Opacifiers used …

Section XVI > Chapter 84 > Heading 8401

Explanatory notes

… water, molten sodium or bismuth, a molten sodium-potassium mixture, molten salts, certain hydrocarbons, etc., are … materials used or the principle of operation (e.g., natural uranium, enriched uranium, uranium-thorium, sodium-graphite, …

Section VI > Chapter 29 > Heading 2903

Explanatory notes

… - Halogenated derivatives of hydrocarbons.               - Saturated chlorinated derivatives of acyclic hydrocarbons : … (1,2-dichloroethane) 2903.19 - - Other               - Unsaturated chlorinated derivatives of acyclic hydrocarbons : …

Section VI > Chapter 29 > Heading 2902

Explanatory notes

… carbon and hydrogen which have at least one ring in their structure. They can be classified in three categories : (A)  … correspond to the general formula C n H 2n when they are saturated monocyclic cyclanes and to the general formula C n … 6, etc.) when they are polycyclic cyclanes or when they are unsaturated (cyclenes). (1)   The monocyclic cyclanes …

Section VI > Chapter 29 > Heading 2901

Explanatory notes

… DERIVATIVES 29.01 - Acyclic hydrocarbons. 2901.10 - Saturated               - Unsaturated : 2901.21 - - Ethylene 2901.22 - - Propene … only carbon and hydrogen which have no rings in their structure. They can be classified in two categories : (A) …

Section VI > Chapter 28 > Heading 2843

Explanatory notes

… by reducing one of their inorganic salts. Colloidal silver occurs in small grains or flakes, bluish, brownish or … may be red, violet, blue or green, and is used for the same purposes as colloidal silver. Colloidal platinum is in small … 2 O) is a brownish‑black powder slightly soluble in water, turning black on exposure to light.       Silver oxide (AgO) …

Section VI > Chapter 29 > Heading 2912

Explanatory notes

… they contain the characteristic group : They are generally colourless liquids with a strong, penetrating odour; many aromatic aldehydes readily oxidise on contact … phenol, ether, etc., functions). (A) ALDEHYDES* (I)   Saturated acyclic aldehydes . (1) Methanal (formaldehyde) …

Section VI > Chapter 28 > Heading 2836

Explanatory notes

… (1)   Ammonium carbonates . Obtained by heating a mixture of chalk and ammonium sulphate (or chloride), or by … commercial ammonium carbonate which, in addition to various impurities (chlorides, sulphates, organic matter), contains … by air, sparingly soluble in water. Used in medicine (uric diathesis) and in the preparation of mixtures for …

Section XIII > Chapter 69 > Heading 6904

Explanatory notes

… earths and refractory goods of sub-Chapter I. For the purpose of the Nomenclature, these articles are classified … ware, etc.), and classification is not affected by the nature of the ceramics used in their manufacture, except in … if they are not glazed). They are white or artificially coloured, translucent (except when of considerable …

Section VI > Chapter 29 > Heading 2907

Explanatory notes

… polyhydric phenols (polyphenols). This substitution in its turn may affect one or more benzene rings; in the first case … tars or by synthesis. White crystals, with a characteristic odour, which turn reddish when exposed to light, or may be … dyes.        To fall in this heading, phenol must have a purity of 90 % or more by weight. Phenol of lower purity is …