A Preface
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This document is prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General Test methods for paints and varnishes.

The fourth edition cancels and replaces the third edition of the technical revision (ISO 16053:2018).

ISO 16053-2022 “Natural Aging test of coatings and paint systems for Outdoor Wood Products with colors and varnishes”

The main changes are as follows:

– Updated regulations on the use of alternative timber species;

— Internal comparison product (ICP) has been replaced by the nominated reference material as weathering reference material (WRM);

– Mold growth assessment has been extended to visual disfiguement of microorganisms;

– Delete the original annex A;

– A new annex G on typical characteristics of common timber species has been added;

– Added a new appendix H for tape testing;

– New annex I on thermal/chemical modification of wood has been added;

This file has been edited and revised.

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 16053-2022 “Natural Aging test of coatings and paint systems for Outdoor Wood Products with colors and varnishes”

1 Scope
This document provides for natural weathering testing of exterior wood coating systems primarily used for the decoration and protection of planed and sawn timber.

This test provides a way to evaluate the performance of a wood coating system during outdoor exposure. It forms the basis for the performance specification in compliance with EN 927-2. It also facilitates the comparison of coating system performance on different substrates, including wood species or other wood modifications.

See Annex E for details.

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 554, standard atmosphere-specification for conditioning and/or testing

ISO 1513, Paints and varnishes – Examination and preparation of test samples

ISO 2409, Paints and varnishes — Cross cut test

ISO 2808:2019, Paints and varnishes-Determination of film thickness

ISO 2810, Paints and varnishes — Natural weathering of paints — exposure and assessment

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

ISO 4628-1:2016, Paints and varnishes. Assessment of degradation of coatings – number and size of defects and designation of intensity of uniform change in appearance – Part 1: General introduction and designation system

ISO 4628-2, Paints and varnishes — Assessment of degradation of coatings — Designation of the number and size of defects and the intensity of uniform changes in appearance — Part 2: Assessment of the degree of foaming

ISO 4628-4, Paints and varnishes – Assessment of degradation of coatings – Specification of the number and size of defects and the intensity of uniform changes in appearance – Part 4: Assessment of the degree of cracking

ISO 16053-2022 “Natural Aging test of coatings and paint systems for Outdoor Wood Products with colors and varnishes”

ISO 4628-5, Paints and varnishes – Assessment of the number and size of defects and the intensity of uniform changes in appearance – Part 5: Assessment of the degree of peeling

ISO 4628-6, Paints and varnishes — Assessment of degradation of coatings — number and size of defects and designation of intensity of uniform changes in appearance — Part 6: Assessment of the degree of pulverization by the tape method

ISO/CIE 11664-4, Colorimetric methods — Part 4: CIE 1976 L*a*b* color space

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

ISO 18314-1, analytical colorimetry — Part 1: Practical color measurement

EN 16492, Paints and varnishes – Assessment of surface disfigment caused by fungi and algae on paints

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