787/24 OSL) International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ME XAYHAPOAHAR OPTAHW3AUMA nO CTAHAAPTM3AUMM+ORGANISATION INTE RNATIONALE DE NORMALISATION General methods of test for pigments and extenders - Part 24 : Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments - Photometric methods Methodes generales d'essai des pigments et matieres de charge -- Partie 24 : Determination du pouvoir colorant relatif des pigments colorés et du pouvoir diffusant relatif des pigments blancs -- Methodes photométriques Second edition - 1985-12-15 ISO 787/24-1985 (E) Ref. No. ISO 787/24-1985 (E) UDC 667.622 : 535.24 : 535.362 Descriptors : paints, pigments, tests, determination, colouring power, photometric method Price based on 11 pages Copyright International Organization for Standardization Not for Resa Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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. They are approved in accordance with iSO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 787/24 was prepared by Technical Committee ISO/TC 35, Paints and varnishes. This second edition cancels and replaces the first edition (IS0 787/24-1982), of which it constitutes a minor revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International 'Standard implies its latest edition, unless otherwise stated. Printed in Switzerland Copyright International Organization for Standardization Notfor Res 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 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 pigment or extender, with a note of any detailed modification which might be needed in view of the special properties of the product in question. Technical Committee ISO/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 Technicail Committee atso 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 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 Pa