787/21 (TSO International Standard INTE RNATIONAL OHGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPTAHW3AUMA HO CTAHAAPTW3AUWMORGANISATION INTE RNATIONALE DE NORMALISATION ANsT nternat Doc Sect General methods of test for pigments and extenders Part 21 : Comparison of heat stability of pigments using a stoving medium Methodes generales d'essai des pigments et matieres de charge Partie 21 : Comparaison de la stabilite a la chaleur des pigments en utilisant un liant au four First edition 1979-12-15 DEC1 $ 1979 ISO 787/21-1979 (E) UDC 667.622 : 620.1 : 531.495 Ref. No. 1SO 787/21-1979 (E) Price based on 2 pages Copyright International Organization for Standardization Not for Resale 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. Standard Iso 787/21 was developed by Technical Committee International ISo/TC 35, Paints and varnishes, and was circulated to the member bodies in March 1978. Australia Israel Romania Italy Bulgaria South Africa, Rep. of Canada Kenya Sweden Egypt, Arab Rep. of Korea, Rep. of Switzerland Turkey Germany, F. R. Netherlands India New Zealand United Kingdom Norway Iran Yugoslavia Ireland Poland The member body of the following country expressed disapproval of the document on technical grounds : France national Organization for Standardization, 1979 ? PrintedinSwitzerland ii Copyright International Organization for Standardization 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 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 wouid 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 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 : Determination of residue on sieve -- Oil method Part 6 Part 7 : Determination of residue on sieve - Water method 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 Pyknometermethod 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, chlor