787/16 International Standard (ISo INTERNATIONAL ORGANIZATION FOR STANDARDIZATION+MEKAYHAPOAHAR OPTAHW3AMR NO CTAHAAPTM3ALWM*ORGANISATION INTERNATIONALEDE NORMALISATION General methods of test for pigments and extenders Part 16 : Determination of relative tinting strength (orequivalent colouring value)and colouronreduction of coloured pigments - Visual comparison method Methodesgenerales d'essaides pigments etmatieres decharge Partie16:Determinationdupouvoircolorantrelatif (ouvaleur de colorationéquivalente)etdelacouleurdegradeedespigments colorés-Methodedecomparaisonvisuelle Secondedition-1986-11-01 ISO 787/16-1986 (E) UDC667.622:620.1:535.668.2 Ref.No.ISO787/16-1986(E) Descriptors: paints, pigments, tests, determination, colouring power, comparison analysis. Price based on 5 pages Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies).The work of preparing International Standards isnormallycarriedoutthroughIsotechnicalcommittees.Eachmember 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- Draft International Standardsadoptedbythetechnical committeesarecirculatedto thememberbodies for approvalbefore 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 StandardISO787/16waspreparedbyTechnical CommitteeISO/TC35, Paintsandvarnishes. clauses 0, 1, 3, 4, 5, 10 of which have been technically revised. 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. InternationalOrganizationforStandardization,1986 Printed in Switzerland ii Copyright Intemational Organization for Standardization ISO 787/16-1986 (E) 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 modifications 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 Inter- national 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 Part2: 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 7 : Determination of residue on sieve -Water method -Manual procedure Part8 : Determination of matter soluble in water - Cold extraction method Part9: 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 tamping Part 13 : Determination of water-soluble sulphates, chlorides and nitrates Part 14 : Determination of resistivity of aqueous extract P