GB/T 33568-2017Evaluation of degradation of coatings on exterior wood (English PDF)
户外用木材涂饰表面老化等级与评价方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 12, 2017
Implementation date
December 1, 2017
Scope
GB/T 33568-2017 is the English-translated version of 户外用木材涂饰表面老化等级与评价方法.
GB/T 33568-2017 sets out how the ageing of a coating on exterior wood is graded and assessed. It gives the terms and definitions for the defects that appear, from discoloration of the film and loss of gloss to cracking, peeling, chalking and mould growth, and then the ageing grades and the method for evaluating them.
It applies to the ageing performance of outdoor wood finishes, both after natural exposure and after artificial ageing, and it covers decorative coatings, whose purpose is mainly decorative.
For the measurements it cites GB/T 250-2008 on the grey scale for assessing change in colour, GB/T 4893.6-2013 on the determination of gloss of furniture surface films and GB/T 17657-2013 on the test methods for wood-based panels and decorative panels. It was issued on 12 May 2017 and has applied since 1 December 2017.
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Document preview — GB/T 33568-2017
National Standard of the People's Republic of China
- ICS
- 79.040
- Classification
- B 69
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative reference documents
- 3 Terms and definitions
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the terms and definitions of outdoor aging of wood, and the aging grade and evaluation method.
This standard is applicable to the evaluation of the aging properties of outdoor wood finish, including natural aging and artificial aging.
2 Normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 250-2008 Textiles - Tests for color fastness - Evaluation of gray - like cards for discoloration
GB/T 4893.6-2013 Furniture surface film physical and chemical properties test Part 6: gloss determination method
GB/T 17657-2013 Test method for physical and chemical properties of wood - based panels and decorative panels
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Discoloration of film
The color of the paint film deviates from its initial color due to the influence of the climate and environment, including fading, darkening, yellowing, bleaching, whitening and so on.
3.2 Loss of gloss
The gloss of the paint film is reduced by the influence of the climate and environment.
3.3 Cracking
The appearance of cracks in the paint film caused by surface aging.
3.4 Peeling
One or more of the coating is separated from its lower coating, or the coating is completely separated from the substrate.
3.5 Chalking
The surface of the paint film due to its degradation of one or more of the paint base and the decomposition of the pigment, showing the phenomenon of loose adhesion of fine powder.
3.6 Mildew-growing
In the hot and humid environment, the surface of the film to produce a variety of mold phenomenon.
3.7 Decorative coating
Mainly decorative effect of the coating.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 250-2008Textiles -- Tests for colour fastness -- Grey scale for assessing change in colour
- GB/T 4893.6-2013Test of surface coatings of furniture -- Part 6: Determination of gloss value
- GB/T 17657-2013Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
Cited by
- LY/T 3298-2022Test method for natural aging performance of exterior wood coatings
- LY/T 3133-2019Water-based coating for exterior wood
- LY/T 3147-2019Coating materials (paints and varnishes) for exterior wood: classification and weathering performance specification
- GB/T 33569-2017Test method of artificial weathering for coatings on exterior wood
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Related Standards
GB/T 17657-2013 — Test Methods of Evaluating the Properties of Wood-based Panels and Surface Decorated Wood-based Panels
GB/T 250-2008 — Textiles -- Tests for colour fastness -- Grey scale for assessing change in colour
GB/T 4893.6-2013 — Test of surface coatings of furniture -- Part 6: Determination of gloss value
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