preface
ISO (International Organization for Standardization) is the global federation of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member group interested in a subject on which a technical committee has been established has the right to be represented on the Committee. International, governmental and non-governmental organizations in liaison 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 standards adopted by the Technical Committee will be circulated to member bodies for voting. Publication as an international standard requires approval by a vote of at least 75% of the member body.

Attention is drawn to the fact that certain elements of this part of ISO 591 May be the subject of patent rights. ISO is not responsible for identifying any or all such patents.

International standard ISO 591-1 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 2, Pigments and Increments.

This part of ISO 591 cancels and replaces ISO 591:1977 and is technically revised. In contrast to ISO 591:1, which specifies the Nakazono reductant method for the determination of titanium dioxide content and permits the use of other methods with the consent of the interested party, ISO 591-1 contains two methods (see article 7).

ISO 591 consists of the following parts under the general heading titanium dioxide pigments for paints:

— Part 1: Specifications and test methods

— Part 2: Determination of minor component content

ISO 591-1-2000 “Titanium dioxide pigments for paints – Part 1: Specifications and test methods”

1 Scope of application
This part of ISO 591 specifies the requirements for titanium dioxide pigments for paints and the corresponding test methods.

2 Normative reference files
The provisions in the following normative documents are incorporated into this part of ISO 591 by reference to this standard. For dated references, no subsequent revisions or amendments to these publications will apply. However, parties to agreements based on this part of ISO 591 are encouraged to investigate the possibility of applying new versions of the following normative documents. New versions of undated references are applicable to this standard. Members of ISO and IEC maintain a register of international standards currently in force.

ISO 385-1:1984, laboratory glassware – burette – Part 1: General requirements.

ISO 648:1977, laboratory glassware – single mark pipettes.

ISO 787-1:1982, General test methods for pigments and increments – Part 1: Comparison of pigment colours.

ISO 787-2:1981, General test methods for pigments and increments-Part 2: Determination of volatiles at 105 °C.

ISO 787-3:2000, General test methods for pigments and increments – Part 3: Determination of water-soluble substances – thermal extraction method.

ISO 787-5:1980, General test methods for pigments and increments – Part 5: Determination of oil absorption value.

ISO 787-9:1981, General test methods for pigments and increments – Part 9: Determination of the pH value of aqueous suspensions.

ISO 787-14:1973, General test methods for pigments – Part 14: Determination of electrical resistivity of aqueous extracts.

ISO 787-18:1983, General test methods for pigments and increments-Part 18: Determination of residue on screens – Mechanical flushing procedure.

ISO 787-24:1985, General methods of test for pigments and increments – Part 24: Determination of the relative tinting force of coloured pigments and the relative scattering force of white pigments – photometric method.

ISO 787-25:1993, General test methods for pigments and increments – Part 25: Comparison of colours in panchromatic systems of white, black and coloured pigments – colorimetric method.

ISO 1042:1998, Laboratory glassware – designated volumetric bottles.

– ISO 3696:1987, Analytical laboratory water – Specification and test methods.

ISO 15528:2000, Paints, varnishes and raw materials for paints and varnishes — sampling.

3 Terms and Definitions
For the purposes of this part of ISO 591, the following terms and definitions apply.

3.1 Titanium dioxide pigment

A pigment consisting primarily of titanium dioxide (TiO 2) with a crystal structure of anatase or rutile determined by X-ray examination

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