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 procedures used to develop this document and those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (see iso.org/directives).

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ISO 8130-13-2019 Coating powders – Part 13: Particle size analysis by laser diffraction

Any trade names used in this document are provided for the convenience of the user and do not constitute an endorsement.

Voluntary, related standards and conformity assessment related ISO specific terminology and express the meaning of and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please see the iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, Common Test Methods for paints and varnishes.

The second edition cancels and replaces the technically revised first edition (ISO 8130-13:2001).

The main changes from the previous edition are as follows:

– Added clauses on precautions, accuracy, reference materials and sources of error;

– More detailed requirements for analyzers (5.1) and expanded descriptions of tests (8.3);

– The test report has been revised to be more detailed;

— The text has been edited and revised, and normative references have been updated.

A list of all the components in the ISO 8130 series can be found on the ISO website.

Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

ISO 8130-13-2019 Coating powders – Part 13: Particle size analysis by laser diffraction

1 Range
This document specifies a method for determining the particle size distribution of coated powder equivalent spheres by laser diffraction for particles ranging in size from 1 μm to 300 μm.

Pay attention to particle size > 300 μm may require the use of different optical models.

This document focuses specifically on the measurement of coating powders and draws attention to ISO 13320, which provides guidance for instrument identification and particle size distribution.

Laser diffraction is not suitable for the determination of very large materials and can be verified by screening analysis as described in ISO 8130-1 or dynamic image analysis as described in ISO 13322-2.

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 291, Plastics – Standard atmospheres for conditioning and testing

ISO 8130-14, Coating powders – Part 14: Vocabulary

ISO 9276-1, Representation of results of particle size analysis – Part 1: Graphical representation

ISO 9276-2, Representation of results of particle size analysis – Part 2: Calculation of average particle size/diameter and moment from particle size distribution

ISO 9276-4, Representation of results of particle size analysis – Part 4: Characterization of classification processes

ISO 13320, particle size analysis – Laser diffraction methods

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

ISO 8130-13-2019 Coating powders – Part 13: Particle size analysis by laser diffraction

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8130-14, ISO 13320 and the following articles apply.

ISO and IEC maintain terminology databases for standardization at the following addresses:

– ISO Online browsing platform: available at iso.org/obp

– IEC electronic encyclopedia: available at electropedia.org/

3.1 Occultation
The percentage or fraction of incident light that is attenuated due to particle extinction (scattering and/or absorption) during laser diffraction measurements

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