Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation
The method consists in reducing of nitrate to ammonia by chromium powder in acid medium, converting of organic and urea nitrogen into ammonium sulfate by digestion with concentrated sulfuric acid in the presence of a catalyst, distilling of the ammonia from an alkaline solution and absorbing in an excess of standard volumetric sodium hydroxide solution. The method is not recommended for materials…
Describes the method applicable to rubbers in raw state and, if compounded, in both the cured and uncured states. These various types of rubbere are described in the standard. Principle, reagents, apparatus, procedure for the pyrolysates, procedure for films cast from solution and the interpretation of the spectra are given. A detailed annex contains tables of diagnostic absorptions and reference…
Copper and copper alloys — Determination of chromium content — Flame atomic absorption spectrometric...
The method is applicable to the determination of chromium contents between 0.003 and 2.0 % (m/m). ISO 4744 specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. An International Standard dealing with the sampling of copper and copper alloys is in preparation.
The method is applicable to products of cadmium-containing copper alloys listed in International Standards having cadmium contents between 0,0005 and 2,0 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Paints and varnishes — Bend test (conical mandrel)
Is one of four documents which specify empirical test procedures for assessing the resistance of coating films to cracking and/or detachment from the substrate under different conditions of deformation. Describes a test procedure for coating on a metallic substrate when subjected to bending under standard conditions. For a multi-coat system, each coat may be tested separately or the complete…
Textile machinery and accessories — Numbering of harnesses for drawing-in on Jacquard machines
Covers continuous pattern cards, banded pattern cards, Jacquard machines, comber boards and harness cord guides for the manufacture of fabrics, the face sides of which lie uppermost in the weaving machine. Does not cover Jacquard equipment for special patterns (for example, symmetrical harnesses) where the standardized pattern holes, hooks and harness cords do not control the first warp threads…
Specifies the method for determining the ability of wire of diameter or thickness 0,3 to 10 mm inclusive to undergo plastic deformation during reverse bending. The range of diameters of thicknesses for which ISO 7801 is applicable may be more exactly specified in the relevant product standard. The test consists of repeated bending, through 90 in opposite directions, of a test piece held at one…
Copper alloys — Determination of chromium content — Titrimetric method
The method is used for the determination of the total chromium content of copper-chromium alloys listed in International Standards. It is applicable to products having chromium contents between 0,10 and 2,0 % (m/m). Specifies principle, reagents, apparatus, procedure, expression of results and test report.
Raccords rapides à oreille interne pour tuyaux d'incendie
Renferme les exigences relatives aux raccords rapides non filetés
du type à oreille interne conçus pour être utilisés dans les
installations de protection contre l'incendie. Les raccords sont
destinés à être reliés aux tuyaux d'incendie présentant les
diamètres standard suivants: 38 mm, 65 mm, 100 mm et 150 mm.
These requirements apply to Factory-Built Chimneys which do not
require field fabrication. They are for use with gas, liquid and
solid fuel-fired residential appliances and building heating
equipment, where the flue-gas temperatures normally do not exceed
650 degrees C.
