Abstract Preview

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.


General information

  • Status :  Published
    Publication date : 1981-09
  • Edition : 1
    Number of pages : 2
  • :
    ISO/TC 256
    Pigments, dyestuffs and extenders
  • 87.060.10
    Pigments and extenders

Buy this standard

Format Language
PDF
Paper
  • CHF38

Life cycle

A standard is reviewed every 5 years



Revisions / Corrigenda

  • Now confirmed
    ISO 787-4:1981

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)

Keep up to date with ISO

Sign up to our newsletter for the latest news, views and product information.