ISO-787-9 › Historical Revision Information
Part 9: Determination of Ph Value of an Aqueous Suspension,General Methods of Test for Pi
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The water used shall be freshly distilled water, boiled before use, but for 5 to 10 min only, in order to avoid an increase of its pH value due to alkali dissolved from the glass. Preparation of a suspension of the material under test, stopper the container, shaking, allow to stand any time, removing the stopper and determination, to the nearest 0.1 unit, of the pH value of the suspension. - Cancels and replaces ISO Recommendation R 787/9-1970.
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87.060.10 (Pigments and extenders)
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Document Number
ISO 787-9:1981
Revision Level
1ST EDITION
Status
Superseded
Publication Date
Sept. 15, 1981
Committee Number
ISO TC 35/SC 2