787/4 (ISo International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPIAHM3ALMA HO CTAHAAPTM3AUMM-ORGANISATION INTERNATIONALE DE NORMALISATION ANsr Internar Dor sert General methods of test for pigments and extenders Part 4 : Determination of acidity or alkalinity of the aqueous extract Methodes generales d'essai des pigments et matieres de charge -- Partie 4 : Determination de I'acidite ou de I'alcalinite de I'extrait aqueux First edition -- 1981-09-15 SEP 3 0 1981 ISO 787/4-1981 (E) UDC 667.622 : 543.241 Ref. No. 1SO 787/4-1981 (E) Descriptors : paints, pigments, tests, chemical analysis, determination, acidity, alkalinity, extraction analysis. Price based on 2 pages Copyright International Organization for Standardization Not for Resa Foreword iso (the international Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. International Standard ISo 787/4 was developed by Technical Committee ISo/TC 35, Paints and varnishes, and was circulated to the member bodies in December 1979. It has been approved by the member bodies of the following countries : India Poland Australia Austria Ireland Romania South Africa, Rep. of Brazil Israel Canada Italy Spain China Kenya Sweden Egypt, Arab Rep. of Korea, Rep. of Switzerland France Netherlands United Kingdom Norway Germany, F. R. USSR No member body expressed disapproval of the document. This International Standard cancels and replaces ISO Recommendation R 787/4-1968, of which it constitutes a technical revision. @ International Organization for Standardization, 1981 Printed in Switzerland Copyright International Organization for Standardization from IHS Not for Resale The purpose of this International Standard is to establish a series of general test methods for pigments and extenders which are suitable for all or many of the individual cross-reference to the general method should be included in the tnternational Standard relating to that pigment or extender, with a note of any detailed modifications which might be needed in view of the special properties of the product in question. Technical Committee tSO/TC 35, Paints and varnishes, decided that all the general methods should be published as they become available, as parts of a single Interna- tional Standard, in order to emphasize the relationship of each to the whole series. The Technical Committee also decided that, where two or more procedures were wide- ly used for determining the same or a similar characteristic of a pigment or extender, there would be no objection to including more than one of them in the Iso series. In such cases it will, however, be essential to state clearly in a specification which method is to be used and, in the test report, which method has been used. Parts of the series already published are as follows : Part 1 : Comparison of colour of pigments Part 2 : Determination of matter volatile at 105 oC Part 3 : Determination of matter soluble in water -- Hot extraction method Part 4 : Determination of acidity or alkalinity of the aqueous extract Part 5 : Determination of oil absorption value Part 6 : Determination of residue on sieve -- Oil method Part 7 : Determination of residue on sieve --- Water method -- Manual procedure Part 8 : Determination of matter soluble in water - Cold extraction method Part 9 : Determination of pH value of an aqueous suspension Part 10 : Determination of density - Pyknometer method Part 11 : Determination of tamped volume and apparent density after