… (1) Hydrogen fluoride (HF). Obtained by the action of sulphuric acid on natural calcium fluoride (fluorite) or on … pressure in steel cylinders or in aqueous solution (hydrosulphuric acid). It is used in analysis, for purifying sulphuric or hydrochloric acids, for obtaining sulphur …
… put up for retail sale : 3402.31 - - Linear alkylbenzene sulphonic acids and their salts 3402.39 - - Other … ions responsible for the surface activity. Examples are : sulphates and sulphonates of fats, vegetable oils (triglycerides) or resin …
… chemi-mechanical process” means fibres obtained by various pulp manufacturing techniques in which defibration is solely … fibres are generally produced in the form of the following pulps : (1) Mechanical pulps , which include stone … not include semi-chemical pulps generally known as neutral sulphite semi-chemical (NSSC), bisulphite semi-chemical or …
… Lithopone and other pigments and preparations based on zinc sulphide 3206.49 - - Other 3206.50 - Inorganic products of a … lead carbonate; oxides of iron, lead, chromium or zinc; sulphides of zinc or mercury; lead chromate ( Chapter 28 )); … which is surface-treated or mixed with calcium or barium sulphate or other substances. These also include titanium …
… (as an intensifier) and in analysis. (4) Mercury sulphides . Artificial mercury sulphide (HgS) is black. When … vermilion) is excluded ( heading 26.17 ). (5) Mercury sulphates . (a) Mercurous sulphate (Hg 2 SO 4 ). White …
… by immersing unsized and unloaded paper of good quality in sulphuric acid for a few seconds. The action of the acid … the same method except that titanium oxide is added to the pulp. The papers thus obtained, although still parchment … one side only (used in the manufacture of certain types of wallpaper) also falls in this heading. Greaseproof papers …
