General test conditions for industrial electro-heating equipment
Applies to all industrial electro-heating such as resistance, electrode, arc, dielectric and infra-red furnaces. It states the general test conditions as the basic measuring methods applicable to all industrial electro-heating equipment.
Nitric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric me...
The method is applicable to the determination of iron contents greater than 0,0001 % (m/m). The principle consists in evaporation of a test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of iron(II)-2,2' -dipyridyl complex in ammonium acetate medium. Photometric measurement of the coloured complex at a wavelength…
Urea for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method
Describes a method applicable to iron contents greater than or equal to 0.00005 % (m/m). The principle is based on the ignition of the material at 800 °C and fusion of the residue with anhydrous potassium hydrogen sulphate. Solution of the cooled melt in hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2,2'bipyridyl complex in the…
Recommended test methods for determining the relative resistance of insulating materials to breakdow...
Assesses the relative resistance of solid insulating materials to breakdown when exposed to partial surface discharges at stresses and frequencies used in industrial service.
