Harmonized System

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Section VI > Chapter 29 > Heading 2939

Section XV > Chapter 76

Explanatory notes

… articles thereof. Aluminium is obtained principally from bauxite, a crude hydrated alumina (see the Explanatory Note … is designed to convert the bauxite into pure aluminium oxide (alumina). For this purpose the ground ore is calcined and then treated with sodium hydroxide to produce a solution of sodium aluminate; this is …

Section XVI > Chapter 84 > Heading 8486

Explanatory notes

… furnaces for zone melting and refining of silicon rods, oxidation furnaces for oxidizing the surface of wafers and diffusion furnaces for … to the generation of a particular type of film. (a)  Oxidation furnaces , which form a “film” of oxide on the …

Section VI > Chapter 38 > Heading 3806

Explanatory notes

… rosin or resin acids in a solution of sodium or potassium hydroxides.  The other inorganic resinates are generally …

Section VI > Chapter 29 > Heading 2931

Explanatory notes

… ‑ ‑ 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide 2931.47 ‑ ‑ (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl … undecane 3,9-dioxide 2931.49 ‑ ‑ Other              - Halogenated … (c)  2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide. (d) …

Section VI > Chapter 28 > Heading 2828

Explanatory notes

… acid, readily giving off chlorine, is a very powerful oxidising and bleaching agent. (1)   Sodium hypochlorite … carbonate on calcium hypochlorite, or by treating sodium hydroxide (caustic soda) with chlorine. This salt, very soluble in water, does not exist in the anhydrous state; it is rather unstable and …

Section VI > Chapter 29 > Heading 2938

Explanatory notes

… Sub-Chapter XII GLYCOSIDES AND ALKALOIDS, NATURAL OR REPRODUCED BY … in medicine as heart stimulants. The group includes digitoxin , white crystalline powder, odourless, very toxic; digoxin ; and digitonin , a saponin of digitalis, …

Section VI > Chapter 28 > Heading 2808

Explanatory notes

… (A) NITRIC ACID Nitric acid (HNO 3 ) is mainly obtained by oxidising ammonia in the presence of a catalyst (platinum, iron, chromium, bismuth or manganese oxides, etc.). Alternatively, nitrogen and oxygen may be … in an electric‑arc furnace and the resulting nitric oxide oxidised. It can also be prepared by the action of …

Section V > Chapter 25 > Heading 2530

Explanatory notes

… OR NOT CALCINED OR MIXED TOGETHER; NATURAL MICACEOUS IRON OXIDES The colours classified here are usually naturally … Verona earth and Cyprus earth (green). Calcination or the mixing together of various earth colours does not affect …

Section XVIII > Chapter 90 > Heading 9005