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.

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.

The international standard ISO 787-10 was developed by the Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 2, Pigments and fillers.

ISO 787-10-1993 – General test methods for pigments and fillers – Part 10: Determination of density – Pygravimetric method

The second edition cancels and replaces the technically revised first edition (ISO 787-10:1981). The second edition includes two methods instead of three, which use the same general principles but are slightly different on the devices used. Method B is more convenient for lower density pigments. Method C was given in the first edition and has been omitted in the second edition.

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

– 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

ISO 787-10-1993 – General test methods for pigments and fillers – Part 10: Determination of density – Pygravimetric method

– 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 residues on screens – mechanical flushing procedure

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

– Part 20: Comparison of dispersability (oscillatory oscillation method)

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

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

ISO 787-10-1993 – General test methods for pigments and fillers – Part 10: Determination of density – Pygravimetric method

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

– 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 colour intensity and residual colour difference at reduction – colorimetric method

More parts are planned. Parts 6 and 12 have been withdrawn. Parts 13, 14, and 17 are printed together in the same document.

ISO 787-10-1993 – General test methods for pigments and fillers – Part 10: Determination of density – Pygravimetric method

1 Range
This part of ISO 787 specifies a general test method for determining the density of a pigment or filler sample using a specific gravity bottle.

ISO 787-23:1979, General test methods for pigments and fillers – Part 23: Determination of density (removal of entrapped air by centrifuge) specifies a general method for the removal of trapped air by centrifuge.

Note 1 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. A different density determination method is specified only if the general method is not applicable to a particular material.

ISO 787-10-1993 – General test methods for pigments and fillers – Part 10: Determination of density – Pygravimetric method

2 Normative references
The following standard contains provisions that, by reference herein, constitute the provisions of this part of ISO 787. At the time of publication, the version shown is valid. All standards are subject to revision and parties to agreements based on this part of ISO 787 are encouraged to investigate the possibility of applying new versions of the following standards. IEC and ISO members maintain a register of currently valid international standards.

ISO 565:1990, test sieve. Wire cloth, perforated metal plate and electroforming plate. The nominal size of the opening.

ISO 842:1984, raw materials for paints and varnishes – Sampling.

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