Rechercher

The principle consists in decomposition of a test portion by Kjeldahl method, distillation of the ammonia liberated, determination of the nitrogen content by titration of the ammonia with sulfuric or hydrochloric acid, using phenolphthalein as indicator. The method is applicable to all types of leather in all types of tannage.

Principle: oxydation of a test portion in a Parr bomb under alkaline conditions to destroy organic matter and to solubilize the mineral matter. Formation of molybdosilicate complex and spectrometric measurement at a wavelength of 630 nm.

Establishes guidelines on the general rules necessary for the preparation and preservation of manuals for earth-moving machinery. A manual shall be simple to understand and have adequate explanatory notes, incorporate the use of internationally recognized symbols, and be easy to use and compact.

Gives methods for tests for thermosetting coating powders as defined in Sub-clause 3.7 of IEC 60455-1. These tests are for material before cure and in cured form. The contents of the corrigendum of August 1991 have been included in this copy.

Contains the requirements for unfilled polyurethane resinous compounds in the cured form for classes PUR-U-4 to PUR-U-8 with an ash content of not more than 6%.

The contents of the corrigendum of July 1985 have been included in this copy.

The contents of the corrigendum of August 1989 have been included in this copy.

Specifies methods of preparing samples of manganese ores for determining the chemical composition and moisture content of a consignment. The methods are applicable to natural or processed manganese ores. Details of the riffle divider to be used are given in the annex.

The method consists in entraining, by means of a strong current of air, of the ammonia from a moderately alkaline test mixture at ambient temperature into standard volumetric sulfuric acid solution, and back-titrating of the excess sulfuric acid solution with standard volumetric sodium hydroxide solution.