OSI) International Standard 787/23 INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAA OPTAHW3ALMR NO CTAHAAPTW3ALWW+ORGANISATION INTERNATIONALE DE NORMALISATION General methods of test for pigments and extenders Part 23 : Determination of density (using a centrifuge to remove entrained air) Methodes generales d'essai despigments et matieres de charge Partie23:Déterminationde la massevolurmique (enutilisantune centrifugeusepourchasser I'air entraine) First edition - 1979-12-27 ISO 787/23-1979 (E) UDC 667.622 : 620.1 : 531.754 Ref.No.1SO 787/23-1979 (E) Descriptors : paints, pigments, tests, density measurement. Price based on 2 pages Foreword ISo (the International Organization for Standardization)is a worldwide federation of national standards institutes (IsO member bodies). The work of developing Interna- tional 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 right to be represented on that committee. International organizations, governmental 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 StandardISo787/23 was developedby Technical Committco ISO/TC35, Paints and varnishes, and was circulated to the member bodies in March 1978. Austria Ireland Poland Bulgaria Israel Romania Canada Italy South Africa, Rep. of Egypt, Arab Rep. of Kenya Sweden France Korea, Rep. of Switzerland Germany, F. R. Netherlands Turkey India New Zealand United Kingdom Iran Norway Yugoslavia Nomemberbodyexpresseddisapprovalofthedocument InternationalOrganizationforStandardization,1979 Printed in Switzerland ii 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 rmany of the individual pigments and extenders for which specifications might be required. In such cases, a cross-reference to the general method should be included in the International Standard relating to that pigent 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 ISO/TC 35 decided that all the general methods should be published as they become available, as parts of a single International 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 widely used for determining the same or a similar characteristic of a pigment or ex- tender, there would be no objection to including more than one of them in the ISC 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 Part 2 : Determination of matter volatile at 105°C 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 Part 8 3 : Determination of matter soluble in water - Cold extraction method Part 9 9:Determination of pH valuc of an aqueous suspension Part 10 : Determination of density -- Pyknometer method Part 11 : Determination of tamped volume and apparent density after tamping Part 12 : Visual comparison of hue of powdered white pigment (Hollow cone method)1) Part 13 : Determination of water-soluble sulphates, chiorides and nitrates Part 14 : Determination of resistivity of aqueous extract Part 15 : Comparison of resistance of coloured pigments of similar types to