Harmonized System

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Section VI > Chapter 28 > Heading 2815

Explanatory notes

… hydroxide (caustic soda) : 2815.11 ‑ ‑ Solid 2815.12 ‑ ‑ In aqueous solution (soda lye or liquid soda) 2815.20 ‑ … by electrolysing sodium chloride. It may be presented as an aqueous solution or an anhydrous solid. Evaporation of the sodium hydroxide aqueous solution produces solid sodium hydroxide in the form …

Section VI > Chapter 38 > Heading 3824

Explanatory notes

… dispersions are special forms) or occasionally solutions. Aqueous solutions of the chemical products of Chapter 28 or … put up in packings for retail sale . These are usually aqueous solutions of chemically defined compounds. In some cases a single compound may be used (e.g., an aqueous solution of chloramine), but in others, two with …

Section VI > Chapter 38 > Heading 3825

Explanatory notes

… feeds. (3)         Ammoniacal gas liquors , produced as an aqueous portion settling out from the crude coal tar … ammonium sulphate) and purified and concentrated aqueous solutions of ammonia gas. (4)         Spent oxide .  … which can vary from liquid or semi-solid dispersions in aqueous or non-aqueous media, exhibiting a wide range of …

Section XIII > Chapter 69 > Heading 6904

Explanatory notes

… Ceramics with a porous body which, unlike porcelain, are opaque, permeable to liquids, easily scratched with iron and … to make the articles impermeable (e.g., with transparent or opaque glazes such as white or coloured metallic oxides). … by a steel point, differs from porcelain because it is opaque and normally only partially vitrified. Stoneware may …

Section VI > Chapter 28 > Heading 2841

Explanatory notes

… solution. Occurs as a white powder soluble in water, in aqueous solutions or in paste form. Used as a mordant in … a filler for soap; for hardening plaster; for manufacturing opaque glass; for purifying industrial water, etc. (b) … (not isolated), permanganic acid (HMnO 4 ) existing only in aqueous solution). (a)  Manganates . Sodium manganate (Na 2 …

Section VI > Chapter 34 > Heading 3402

Explanatory notes

… may be : (1)         Anionic , in which case they ionise in aqueous solution to produce negatively charged organic ions … salts. (2)         Cationic , in which case they ionise in aqueous solution to produce positively charged organic ions … Non-ionic , in which case they do not produce ions in an aqueous solution. Their solubility in water is due to the …

Section VI > Chapter 28 > Heading 2840

Explanatory notes

… (perborax). Obtained by the action of sodium peroxide on an aqueous solution of boric acid, or by treating an aqueous solution of sodium borate with hydrogen peroxide. …

Section VI > Chapter 32 > Heading 3204

Explanatory notes

… non-ionic dyes which are applied to hydrophobic fibres from aqueous dispersion. They are used on polyester, nylon or … Direct dyes are water-soluble anionic dyes which, in aqueous solution in the presence of electrolytes, are …

Section I > Chapter 3 > Heading 0301

Explanatory notes

… heading are normally transported in suitable containers (aquaria, fish tanks, etc.) in which they can be kept alive … normally used for ornamental purposes, in particular, in aquaria. …

Section VI > Chapter 28 > Heading 2833

Explanatory notes

… and sulphuric acid. Crystalline powder, violet or green, in aqueous solution. Used as a mordant in dyeing (chrome … of heat transforms them into white anhydrous sulphate. Aqueous solutions are green but turn brownish on exposure to …