Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric me...
The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter…
Glycerines for industrial use — Samples and test methods — General
The procedures specified are applicable to the analysis of crude or distilled glycerols having a glycerol content greater than 75 % (m/m). The methods relate to determination of alkalinity or acidity, determination of sulphated ash, determination of water, determination of density at 20 °C, determination of ash, arsenic, and glycerol. - Replaces ISO Recommendation R 1614-1970.
Potassium chloride for industrial use — Determination of potassium content — Potassium tetraphenylbo...
The method is applicable to products having a minimum KCL content of about 95 % (m/m). The principle consists in dissolution of a test portion taken from the laboratory sample, previously ground and sifted. Addition of formaldehyde solution to transform any ammonium ions present into hexamethylenetetramine, and of ethylenedinitrilotetraacetic acid, disodium salt, to complex any extraneous cations…
Potassium chloride for industrial use — Determination of potassium content — Sodium tetraphenylborat...
The method is applicable to products having a minimum KCl content of about 95 % (m/m). The principle consists in dissolution of a test portion taken from the previously ground and sifted laboratory sample and elimination of many ammonium ions present. Precipitation of the potassium, in a slightly acid medium, by an excess of an standard volumetric sodium tetraphenylborate solution. Filtration and…
Magnesium and magnesium alloys — Determination of copper content — Oxalyldihydrazide photometric met...
The method is applicable to the determination of copper content between 0,002 and 0,4 % (m/m) in magnesium and magnesium alloys other than alloys containing zirconium. Specifies principle and procedure of the method, reagents, apparatus, sampling, expression of results and test report.
Aluminium and aluminium alloys — Determination of copper content — Oxalyldihydrazide photometric met...
The method is applicable to the determination of copper content between 0,002 and 0,8 % (m/m) in magnesium and magnesium alloys. The method is not completely applicable in the special case of alloys with silicon contents exceeding 1 % (m/m), for which it should be modified as desribed in the annex.
Safety of household and similar electrical appliances - Part 1: General requirements
This second edition of IEC 60335-1 (1976) and its 6 amendments, is applicable only to the IEC 60335-2-57 and 60335-2-63. Is not applicable to the other parts 2.
The contents of the corrigendum of February 1993 have been included in this copy.
First supplement - Dimensions of spindle ends for manually operated electronic components
Contains dimensions and tolerances for spindle ends made to original inch dimensions.
The contents of the corrigendum of September 1979 have been included in this copy.
