Harmonized System

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Section VI > Chapter 28 > Heading 2853

Explanatory notes

… The most important of the phosphides falling here are obtained by direct action of the constituent elements; they … and renders soft organic materials brittle. It is used for obtaining oxygen, nitrogen and rare gases by fractional …

Section VI > Chapter 28 > Heading 2815

Explanatory notes

… is sodium carbonate ( heading 28.36 ). Sodium hydroxide is obtained, for example, by causticising sodium carbonate with … regenerated cellulose, mercerising of cotton, tantalum or niobium metallurgy, production of hard soaps, manufacture of … etc.). The heading excludes residual lyes (soda lyes) obtained as residual products from the manufacture of wood …

Section VI > Chapter 28 > Heading 2830

Explanatory notes

… (b) Sodium hydrogen sulphide (hydrosulphide) (NaHS). Obtained by the action of hydrogen sulphide on the neutral … etc. (2)   Zinc sulphide (ZnS). Artificial zinc sulphide is obtained in the hydrated form by precipitating an alkali …

Section VI > Chapter 29 > Heading 2902

Explanatory notes

… examples are : (a)  Cyclopropane (C 3 H 6 ) (gas). (b) Cyclobutane (C 4 H 8 ) (gas). (c)  Cyclopentane (C 5 H 10 ) … compounds rich in carbon (coal, lignite, etc.); also obtained synthetically. In the pure state, it is a …

Section VI > Chapter 28 > Heading 2804

Explanatory notes

… - Arsenic 2804.90 - Selenium (A) HYDROGEN Hydrogen is obtained by electrolysing water, or from water‑gas, … light). (5)   Xenon (gives a blue light). Rare gases are obtained by fractionating liquid air, or also (in the case … nor supports combustion, but extinguishes flames. It is obtained by fractional distillation of liquid air, and is …

Section VI > Chapter 29 > Heading 2935

Section I > Chapter 3 > Heading 0302

Explanatory notes

… ( Katsuwonus pelamis ) 0302.34 ‑ ‑ Bigeye tunas ( Thunnus obesus ) 0302.35 ‑ ‑ Atlantic and Pacific bluefin tunas ( …

Section XVIII > Chapter 90 > Heading 9018

Explanatory notes

… as cephalometers, dividers for measuring cerebral lesions, obstetrical pelvimeters, etc. It should also be noted that a … kidney (dialysis) apparatus . (K)  Gynaecological or obstetrical instruments  : vaginal retractors; hysterectomy instruments; obstetrical stethoscopes; specialised optical instruments …

Section VI > Chapter 29 > Heading 2907

Explanatory notes

… and its salts 2907.29 - - Other Phenols are obtained by replacing one or more hydrogen atoms of the … benzene rings; in the first case mononuclear phenols are obtained, in the second, polynuclear phenols. The hydroxyl …

Section XVIII > Chapter 90 > Heading 9002

Explanatory notes

… elements of glass not optically worked.               ‑ Objective lenses : 9002.11 ‑ ‑ For cameras, projectors or … for microscopes or polarimeters. (3)   Eyepieces and objectives (including polarising) for astronomical …