Harmonized System

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Section VI > Chapter 29 > Heading 2909

… ether-phenols, ether-alcohol-phenols, alcohol peroxides, ether peroxides, acetal and hemiacetal peroxides, ketone peroxides …

Explanatory notes

… Sub-Chapter IV ETHERS, ALCOHOL PEROXIDES, ETHER PEROXIDES, ACETAL AND HEMIACETAL PEROXIDES , KETONE PEROXIDES, EPOXIDES WITH A THREE-MEMBERED RING, ACETALS AND … nitrated or nitrosated derivatives : 2909.41 - - 2,2’-Oxydiethanol (diethylene glycol, digol) 2909.43 - - …

Section VI > Chapter 28 > Heading 2815

… Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); peroxides of sodium or potassium. …

Explanatory notes

… 28.15 ‑ Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); peroxides of sodium or potassium.               ‑ Sodium … is used in soap manufacture, for bleaching fabrics, as an oxidising agent in organic synthesis, or for purifying …

Section VI > Chapter 29 > Heading 2917

… Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or …

Explanatory notes

… 29.17  - Polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, … peroxides, peroxyacids and their derivatives : 2917.11 - - Oxalic acid, its salts and esters 2917.12 - - Adipic acid, … potassium, sodium, calcium, iron and ammonium-iron oxalates.        Its main esters are dimethyl and diethyl …

Section VI > Chapter 29 > Heading 2915

… Saturated acyclic monocarboxylic acids and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or …

Explanatory notes

… Sub-Chapter VII CARBOXYLIC ACIDS AND THEIR ANHYDRIDES , HALIDES, PEROXIDES AND PEROXYACIDS AND THEIR HALOGENATED, … are compounds in which two acyl radicals are linked by two oxygen atoms; their general formula is RC(O)OOC(O)R 1 * , in …

Section VI > Chapter 28 > Heading 2817

… Zinc oxide; zinc peroxide. …

Explanatory notes

… 28.17 ‑ Zinc oxide; zinc peroxide. (A) ZINC OXIDE Zinc oxide (zinc white) (ZnO) is obtained by burning zinc vapour with oxygen from air.  The zinc vapour is obtained by vaporising …

Section VI > Chapter 28 > Heading 2819

… Chromium oxides and hydroxides. …

Explanatory notes

… 28.19 ‑ Chromium oxides and hydroxides. 2819.10 ‑ Chromium trioxide 2819.90 ‑ … When combined with alcohol it gives explosive mixtures. An oxidising agent in organic chemistry (manufacture of isatin, …

Section VI > Chapter 28 > Heading 2841

… Salts of oxometallic or peroxometallic acids. …

Explanatory notes

… 28.41 ‑ Salts of oxometallic or peroxometallic acids. 2841.30 ‑ Sodium … and peroxometallic acids (corresponding to metal oxides which constitute anhydrides). The main groups of …

Section VI > Chapter 28 > Heading 2811 > 2811.2 > 2811.22

… Silicon dioxide …

Classification opinions

… 1. Silica fume , composed of ultrafine amorphous silicon dioxide particles (not less than 80 % by weight), formed as … impurities include carbon, silicon, silicon carbide and oxides of alkaline metals. The product typically contains … that binds harmful substances such as allergens, toxins, bacteria and viruses, and removes them from the …

Section VI > Chapter 28 > Heading 2818

… corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide. …

Explanatory notes

… corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide. 2818.10 ‑ Artificial corundum, … The aluminium oxide may contain small proportions of other oxides (e.g., titanium oxide, chromium oxide) either …

Section VI > Chapter 28 > Heading 2821

… Iron oxides and hydroxides; earth colours containing 70 % or more by weight …

Explanatory notes

… 28.21 ‑ Iron oxides and hydroxides; earth colours containing 70 % or more … salt. White solid which discolours in the presence of oxygen, turning into ferric hydroxide. (2)   Ferric …

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