Harmonized System

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Section VI > Chapter 28 > Heading 2835

Explanatory notes

… (hypophosphite) (NaPH 2 O 2 ), in white tablets or crystalline powder, hygroscopic. (II)  Calcium phosphinate (hypophosphite) (Ca(PH 2 O 2 ) 2 ), colourless crystals or a white powder (obtained by the action of white … a few units to a few thousand.       They occur as white crystalline powders, soluble or insoluble in water; they are …

Section XVIII > Chapter 90 > Heading 9013

Explanatory notes

… stimulated emission. When the lasing medium (e.g., crystals, gases, liquids, chemical products) is excited by … addition to the lasing medium, the energy source (pumping system) and the resonant optical cavity (reflector system), … they can be used independently, as compact lasers or laser systems, for various purposes such as research, teaching or …

Section XVI > Chapter 84 > Heading 8421

Section XVI > Chapter 85 > Heading 8517

Section VI > Chapter 29 > Heading 2909

Section XVI > Chapter 85 > Heading 8518

Explanatory notes

… of a diaphragm, sets up strains in a specially cut piece of crystal (e.g., quartz or rock crystal), thus causing the production of electric charges on the crystal. This type of element is often used in the “contact” …

Section XVI > Chapter 85 > Heading 8504

Explanatory notes

… by means of induction and using a preset or adjustable system, an alternating current into another alternating … measuring instruments, electricity meters or protective relays. The heading covers all transformers.  They vary from … or tubes, small types used in wireless sets, instruments, toys, etc., to large types enclosed in oil tanks or equipped …

Section XV > Chapter 78

Explanatory notes

… 0.002 0.001   GENERAL This Chapter covers lead and its alloys, and certain articles thereof. Lead is mainly … is easily alloyed with other elements. The principal lead alloys which may fall in this Chapter under the provisions … Note to that Section), are the following : (1)   Lead‑tin alloys used, for example, in lead‑based soft solders, in …

Section VI > Chapter 29 > Heading 2934

Explanatory notes

… Compounds containing in the structure a benzothiazole ring-system (whether or not hydrogenated), not further fused … Compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused … are used as tonics and stimulants for the nervous system and solvents for uric acid . The heterocyclic …

Section VI > Chapter 28 > Heading 2840

Explanatory notes

… acid (H 3 BO 3 ) (heading 28.10). Borates obtained by crystallisation or by a chemical process are covered by this … of these is metaborate (NH 4 BO 2 .2H 2 O). Colourless crystals, very soluble in water, efflorescent. Decomposed by … (5)   Nickel borate . Pale green crystals, used as a catalyst. (6)   Copper borate . Blue crystals, very hard, …