Rechercher

1. SCOPE 1.1 This Standard covers the requirements for the safe installation, operation and maintenance of woodworking machinery, including cooperage and veneering operations and the finishing of wood products. 1.2 This Standard does not apply to logging and primary milling operations.

The principle is based on the dissolution, in hot hydrochloric acid, of the residue from the determination of the ash of a test portion (see ISO 1389/8). Reduction, by hydroxylammonium chloride, of the iron(III) contained in the solution thus obtained, formation of the coloured complex iron(II)-2,2'bipyridyl in a buffered medium. Photometric measurement of the coloured complex at a…

The principle consists in treatment of a test portion in acid solution with excess standard volumetric potassium bromide-potassium bromate solution, addition of potassium iodide solution and titration of the liberated iodine with a standard volumetric solution of sodium thiosulphate. - Replaces ISO Recommendation R 761-1968.

Conversion of the iron in a test portion to iron(III) sulphate by evaporation to dryness in the presence of sulphuric acid. Dissolution in nitrid acid, reduction of the trivalent iron in the solution thus obtained by hydroxylammonium chloride. Photometric measurement of the coloured complex iron(II)-2,2' -dipyridyl. Applicable to products having Fe contents in the range 0,1 to 2 mg/kg.

With respect to the free acidity, applicable to products having contents, expressed as H2 SiF6 , equal to or more than 0,1 % (m/m). First, determination of the free acid contents by titration of an ice-cooled test portion with a standard volumetric sodium hydroxide solution in the presence of potassium nitrate and using bromothymol blue as indicator, then, followed by titration at near boiling…

Specifies physical and performance requirements, methods of test and marking requirements. The mandatory requirements apply to helmets for general use in industry. Additional optional performance requirements are included: Shock absorption, penetration, flammability, electrical insulation, and lateral rigidity.

The principle consists in a decomposition of most of the formic acid in a test portion by sulphuric acid an of the remainder by chromic acid. Steam distillation of acetic acid and/or other volatile acids and titration of the distillate with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The method is applicable to products containing less than 0,5…

Gives general instructions relating to methods of test, especially for sampling. ISO/R 731 has been subdivised into seven parts. ISO 731/1 replaces clauses 1, 2 and 7 of ISO Recommendation R 731-1968.