Harmonized System

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Section VI > Chapter 38 > Heading 3804

Explanatory notes

… the source of tall oil and are sometimes used to produce sodium hydroxide. The heading excludes : (a)   Sodium hydroxide ( heading 28.15 ). (b)   Tall oil ( heading …

Section VI > Chapter 38 > Heading 3813

Explanatory notes

… or    (2) Two or more unmixed products (e.g., a solution of aluminium sulphate and a solution of sodium hydrogencarbonate), separated by a partition and …

Section V > Chapter 25 > Heading 2525

Explanatory notes

… biotite, etc.) constitutes a group of natural complex aluminium silicates characterised by the fact that they are … made from bonded (built‑up) splittings (e.g., micanite, micafolium) or from pulped (reconstituted) mica ( heading  …

Section VI > Chapter 28 > Heading 2807

Explanatory notes

… sulphur dioxide over a catalyst (platinum, ferric oxide, vanadium pentoxide, etc.). It is freed from impurities … lead sulphate) by treatment with hydrogen sulphide or ammonium sulphide. Sulphuric acid is a very strong …

Section V > Chapter 25 > Heading 2512

Explanatory notes

… e.g., diatomite calcined with sintering agents such as sodium chloride or sodium carbonate ( heading 38.02 ).  On the other hand, …

Section XI > Chapter 59 > Heading 5908

Explanatory notes

… whether or not impregnated with chemicals (especially thorium or cerium nitrate). (C)  Incandescent gas mantles .        The …

Section VI > Chapter 38 > Heading 3816

Explanatory notes

… dolomite, with an added refractory binder (for example, sodium silicate, magnesium or zinc fluosilicates).  Many of the products of …

Section V > Chapter 25 > Heading 2513

Explanatory notes

… (bimskies). Emery is a dense rock formed of small hard aluminium oxide crystals mixed with iron oxide and particles … of iron oxide. Natural corundum is also composed largely of aluminium oxide but, unlike emery, it is often presented in …

Section XVI > Chapter 84 > Heading 8421

Section VII > Chapter 40