Sintered metal bushes — Determination of radial crushing strength
Specifies a method of measuring the radial crushing strength of sintered metal parts in the form of hollow cylinders commonly known as bushes. The method is applicable to sintered bushes composed of pure or alloyed metal powders. Gives principle, apparatus, test piece, procedure, expression of results and test report.
Urea for industrial use — Measurement of the variation of pH in the presence of formaldehyde — Poten...
Specifies the principle of measurement, at (20 0.5) 0C, of the quantity of 0.01 N sodium hydroxide standard volumetric solution required to take the pH of a solution containing 50 g of sample in 100 ml of water to a pH of 8.3 after addition of formaldehyde. Has also been approved by the IUPAC.
Urea for industrial use — Determination of water content — Karl Fischer method
Specifies the manner in which this method is to be applied in a reaction of any water present in urea with a solution of iodine and sulphur dioxide in a mixture of pyridine and methanol (Karl Fischer reagent). This reagent is first standadized by titration with a precisely known mass of water. The end point of the reaction is read by the direct visual or direct electrometric method. The method…
Urea for industrial use — Determination of biuret content — Photometric method
Applicable to the determination in the presence of ammoniacal salts less than 15 mg in the aliquot amount taken for the determination. In the presence of quantities exceeding 15 mg the ammoniacal nitrogen shall be removed by a cation exchange resin because these salts interfere with the determination. The principle of the reaction consists in formation of a violet-red complex between allophanic…
1,1,1- Trichloroethane for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, of the density at 20 0C, of residue on evaporation, of the water content, of the acidity and the measurement of colour in Hazen units. Has also been approved by the IUPAC.
Hexachlorobenzene for industrial use — List of methods of test
Specifies the sampling, the determination of the distillation characteristics subjected to the modifications appropriate for this product, of the water content, of the density at 20 0C and of the crystallizing point. Has also been approved by the IUPAC.