A Preface
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The procedures used to develop this document as well as 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 editorial rules of Part 2 of the ISO/IEC Directive (see iso.org/directives).

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This document has been prepared by Technical Committee ISO/TC 35 (Paints and Varnishes), Subcommittee SC 9 (General test methods for paints and discolorations), in cooperation with Technical Committee CEN/TC 139 (Paints and varnishes) of the European Committee for Standardization (CEN), in accordance with the Technical Cooperation Agreement between ISO and CEN (Vienna Agreement).

The second edition cancels and replaces the technically revised first edition (ISO 8130-8:1994). Compared with the previous edition, the main changes are as follows:

– Article 3 on terms and definitions is added;

— Article 6 adds pretreated aluminum plates as an alternative to test plates;

– Table 1 describes the degree of agglomeration of four different grades of paint powders that have been removed;

– The required supplementary information (original clause 4 and Annex A) has been incorporated into the test report;

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

A list of all parts 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 full list of these agencies can be found at iso.org/members.html.

ISO 8130-8-2021 Powder coatings – Part 8: Evaluation of storage stability of thermoset powders

Introduction
Paint powders are subject to two different aging mechanisms, one involving the physical state of the powder and the other involving its chemical reactivity. Changes in the coating powder may lead to deterioration of the physical and chemical properties of the final coating.

This document describes the procedures to be adopted in assessing the tendency of thermoset paint powders to maintain their physical and chemical integrity after being subjected to prescribed storage conditions.

No correlation occurs between changes in different properties. Again, there may be no correlation between the results obtained under different storage conditions.

The program results in this document demonstrate the ability of paint powders to withstand the effects of storage prior to application.

1 Scope
This document establishes a method for estimating the storage stability of thermoset paint powders. It provides procedures for determining the physical state of thermoset coating powders and their chemical reactivity changes as well as their ability to form a satisfactory final coating.

ISO 8130-8-2021 Powder coatings – Part 8: Evaluation of storage stability of thermoset powders

2 Normative references

The following documents are referenced in the text in such a way that some or all of their contents constitute the requirements of this document. For dated references, only the cited version applies. For undated references, the new version of the reference (including any revisions) applies.

ISO 1514, Paints and varnishes — Test standard panel

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 2813, Paints and varnishes — Determination of gloss values at 20°, 60° and 85°

ISO 6272-1, paints and varnishes — Rapid deformation (impact resistance) test — Part 1: drop hammer test, large area indenters

ISO 8130-6, Coating powders — Part 6: Determination of gel time of thermoset coating powders at a given temperature

ISO 8130-14, coating powders — Part 14: Vocabulary

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

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

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