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ISO 787-4:1981

General methods of test for pigments and extenders — Part 4: Determination of acidity or alkalinity of the aqueous extract

Sep 1, 1981

General information

90.93     Sep 3, 2024

ISO

ISO/TC 256

International Standard

87.060.10  

French   English  

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Published

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 787-4:1981
90.93 Standard confirmed
Sep 3, 2024

National adoptions

SRPS H.C8.204:1989  
ISS

General methods of test for pigments and extenders — Part 4: Determination of acidity or alkalinity of the aqueous extract

95.99   Withdrawal of Standard

H035 more

SRPS EN ISO 787-4:2017  
ISS

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

60.60   Standard published

H035 more