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EN ISO 787-4:2017

Current
Current

The latest, up-to-date edition.

General methods of test for pigments and extenders - Part 4: Determination of acidity or alkalinity of the aqueous extract (ISO 787-4:1981)
Published date

18-10-2017

European foreword
Foreword
0 Introduction
1 Scope and field of application
2 References
3 Reagents
4 Apparatus
5 Sampling
6 Procedure
7 Expression of results
8 Test report

The principle of the method consists in the hot extraction of the material by following the procedure specified in ISO 787/3, to the stage of obtaining a perfectly clear filtrate. The determination is carried out with indicator solution (method A). If the solution with the methyl red indicator is yellow (alkaline), titrate it with the hydrochloric acid solution to an orange end-point; if the solution with the methyl red indicator is red (acid), titrate it with the sodium or potassium hydroxide solution to an orange end-point. The other method (method B) is the potentiometric determination. Take 100 ml of the test solution, insert the electrodes of the pH measuring device and read the pH value.

Committee
CEN/TC 298
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

ISO 842:1984 Raw materials for paints and varnishes Sampling
ISO 787-3:2000 General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method
ISO/R 385:1964 Burettes

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