Specification for cellulosic papers for electrical purposes. Part 1: Definitions and general require...
Gives definitions and general requirements, including a designation system and lists of thicknesses. The contents of the corrigendum of March 1979 have been included in this copy.
Methods of test for the determination of ionic impurities in electrical insulating materials by extr...
Applies to the determination of whether or not ionizable soluble organic and inorganic materials are present by measuring the increase in volume conductivity of a liquid extract.
The contents of the corrigendum of June 1978 have been included in this copy.
Determination of the aromatic hydrocarbon content of new mineral insulating oils
Applies to quality control and acceptance testing of oils. Two methods of analysis are given: infra-red spectrophotometry and adsorption chromatography. The contents of the corrigendum of July 1978 have been included in this copy.
Essential oils (containing tertiary alcohols) — Estimation of free alcohols content by determination...
The estimation is carried out by acetylation of the essential oil by acetyl chloride and acetic anhydride, in the presence of dimethylaniline. The acetylated oil is isolated and dried and the ester value is determined. The free alcohols content is calculated taking into account the ester values of the same but non-acetylated essential oil. This method is applicable to essential oils containing an…
Is applicable to sweetened condensed milk of normal composition prepared from whole, partially skimmed or skimmed milk and sucrose only and containing no altered succrose. The principle consists in treating the sample with ammonia, neutralizing and clarifying by addition of zinc acetate and potassium hexacyanoferrate(II). This is following by filtration and determination of the optical rotation…
Aluminium and aluminium alloys — Determination of chromium — Spectrophotometric method using dipheny...
The method is applicable to chromium contents between 0,002 and 0,60 % (m/m). It may be extended to chromium contents of up to 1,5 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Potassium hydroxide for industrial use — Determination of calcium and magnesium contents — Flame ato...
Applicable to products having contents of more than 2.5 mg Ca/kg and 0.5 mg Mg/kg if an acetylene-air flame is used or 0.6 mg Ca/kg and 1.0 mg Mg/kg if an acetylen-dinitrogen monoxide flame is used. The principle consists in the acidification of a test portion with hydrochloric acid, aspiration of the solution into an acetylene-dinitrogen monoxide flame or acetylene-air flame. In the latter case…
Phosphoric acid for industrial use (including foodstuffs) — Determination of calcium content — Flame...
Applicable to products having a Ca content of more than 50 mg/kg. Soluble SiO2 present in the solution at levels lower than 5 g/ml does not interfere. The principle consists in addition, to a hydrochloric acid solution of the test portion, of sodium ions to promote and stabilize the emission of calcium and of lanthanum ions to suppress the interference of aluminium. Specifies the aspiration of…
