introduction
ISO (International Organization for Standardization) is a 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 for which a technical committee has been established has the right to be represented on the Committee. International organizations, governments and non-governmental organizations in contact 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 a vote of at least 75% of the member bodies.

Some elements of this part of ISO 591 May be the subject of a patent right. ISO is not responsible for identifying any or all such patents.

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

The international standard ISO 591-1 was developed by the Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 2, Pigments and increments.

This part of ISO 591 cancels and replaces ISO 591:1977 with a technical revision. In contrast to ISO 591:1977, where ISO 591-1 specifies the Nakazono reducing agent method for the determination of titanium dioxide content and allows for the use of other methods with the consent of the interested party, ISO 591-1 contains both methods (see article 7).

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

— Part 1: Specifications and test methods

– Part 2: Determination of the content of minor components

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

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

2 Normative reference documents
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. For undated references, the new version applies to this standard. ISO and IEC members maintain a register of currently valid international standards.

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

ISO 648:1977, Laboratory glassware – Single standard pipettes.

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

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

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

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

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

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

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

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

ISO 787-24:1985, General test methods 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 – labeled volumetric bottles.

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

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

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

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

3.1 Titanium dioxide pigments

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

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