BS EN ISO 787-4:2017
Current
The latest, up-to-date edition.
General methods of test for pigments and extenders Determination of acidity or alkalinity of the aqueous extract
Hardcopy , PDF
English
09-11-2018
Important note : Users cannot be edited or removed once added to your Multi user PDF.This part of ISO 787 specifies a general method of test for determining the acidity or alkalinity of the aqueous extract of a sample of pigment or extender.
| Committee |
W/-
|
| DocumentType |
Standard
|
| ISBN |
9780580968297
|
| Pages |
12
|
| ProductNote |
This standards also refers to ISO/TR 385,ISO/R 385,ISO 787
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
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.
| Standards | Relationship |
| ISO 787-4:1981 | Identical |
| EN ISO 787-2:1995 | Identical |
| EN ISO 787-4:2017 | Identical |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.