introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

International standards are drafted in accordance with the rules given in Part 3 of the ISO/IEC Directive.

The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.

ISO 787-3-2000 General test methods for pigments and fillers – Part 3: Determination of water-soluble substances – Hot extraction method

Please note that some elements of this part of ISO 787 May be the subject of patent rights. ISO is not responsible for identifying any or all such patents.

The international standard ISO 787-3 was developed by the Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 2, Pigments and fillers.

The second edition cancels and replaces the technically revised first edition (ISO 787-3:1979).

ISO 787 consists of the following sections, entitled General Test Methods for pigments and fillers:

– Part 1: Comparison of pigment colors

– Part 2: Determination of volatile substances at 105°C

– Part 3: Determination of water-soluble substances – hot extraction method

– Part 4: Determination of acidity or alkalinity of water extracts

ISO 787-3-2000 General test methods for pigments and fillers – Part 3: Determination of water-soluble substances – Hot extraction method

– Part 5: Determination of oil absorption value

– Part 7: Determination of residue on screens – water method – Manual procedure

– Part 8: Determination of water-soluble substances – Cold extraction method

– Part 9: Determination of pH of water suspensions

– Part 10: Determination of density – Specific gravity bottle method

– Part 11: Determination of compaction volume and apparent density after compaction

– Part 13: Determination of water-soluble sulfates, chlorides and nitrates

– Part 14: Determination of the resistivity of water extracts

– Part 15: Comparison of light resistance of similar types of colored pigments

– Part 16: Determination of the relative tint force (or equivalent tint value) and color of coloured pigments during reduction – Visual comparison method

– Part 17: Comparison of lightning power of white pigments

– Part 18: Determination of sieve residue – Mechanical flushing procedure

– Part 19: Determination of water-soluble nitrates (salicylic acid method)

– Part 21: Comparing the thermal stability of pigments using baking media

– Part 22: Comparison of the resistance of pigments to infiltration

– Part 23: Determination of density (removal of ensnared air by centrifuge)

ISO 787-3-2000 General test methods for pigments and fillers – Part 3: Determination of water-soluble substances – Hot extraction method

– Part 24: Determination of the relative coloring power of colored pigments and the relative scattering power of white pigments – photometric method

– Part 25: Color comparison of white, black and colored pigments in full color systems – colorimetric method

– Part 26: Determination of relative coloring strength and residual color difference of colorants – Weighted K/S value method

1 Range
This part of ISO 787 specifies a common test method for determining the mass percentage of substances soluble in boiling water, pigment samples, or filler samples.

ISO 787-8 specifies a method for determining the mass percentage of substances soluble in water by cold extraction. For most pigments and fillers, the two test methods will give different results, so it needs to be clearly stated in the instruction manual which method will be used, and clearly stated in the test report which method was used.

Note that the general methods given in the various parts of ISO 787 are generally applicable to any pigment or filler. Therefore, it is only necessary to include a cross-reference to the appropriate part of ISO 787 in the international standard, giving the specification for that pigment or filler and indicating any detailed modifications that may be required in view of the particular properties of the material in question. Different methods for the determination of water-soluble substances are specified only when the general method is not applicable to a particular material.

ISO 787-3-2000 General test methods for pigments and fillers – Part 3: Determination of water-soluble substances – Hot extraction method

2 Normative references
The following normative documents contain provisions that, by reference herein, constitute the provisions of this part of ISO 787. For dated references, any subsequent revisions or amendments to these publications will not apply. However, Parties to agreements based on this part of ISO 787 are encouraged to investigate the possibility of applying new versions of the following normative documents. For undated references, a new version of the standard-setting document referred to applies. ISO and IEC members maintain a register of currently valid international standards.

ISO 787-4:1981, General test methods for pigments and fillers – Part 4: Determination of acidity or alkalinity of water extracts.

ISO 787-8:2000, Common test methods for pigments and fillers. Part 8: Determination of substances soluble in water. Cold extraction.

ISO 1042:1998, Laboratory glassware. Single label volumetric bottle.

ISO 15528:2000, Paints, varnishes and raw materials for paints and varnishes – Sampling.

Only the standard information section is public. To see the full content, you need to purchase the standard through the official channels.