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Depth profile of UV-induced wood surface degradation / V. Jirous-Rajkovic in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B4 (12/2004)
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Titre : Depth profile of UV-induced wood surface degradation Type de document : texte imprimé Auteurs : V. Jirous-Rajkovic, Auteur ; H. Turkulin, Auteur ; E. R. Miller, Auteur Année de publication : 2004 Article en page(s) : p. 241-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Détérioration
Bois -- Effets du rayonnement ultraviolet
Bois -- Teinture
Essais accélérés (technologie)
Essais dynamiques
Lasures
Photostabilisants
Résistance à la traction
Sapins
Traitement chimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The depth profile of weathering effects on wood was studied after the laboratory ultraviolet exposure of fir-wood. The ‘thin strip’ method (ie the measurement of changes in tensile properties of microtomed wood sections) was modified in terms of exposure of batches of strips packed in bundles and exposed in a QUV apparatus. The bundles of strips were exposed untreated, covered with surface strips that had been impregnated with chromium (VI) trioxide or Fe(III) nitrate, or protected with free films of clear stain with photostabilisers and without photostabilisers.
It has been shown that ultraviolet (UV) light penetrates the fir-wood surface to a depth greater than 70µm, resulting in changes in the tensile strength of the fir-wood strips to a depth of 70 to 140µm. Strength changes in lower levels (down to 280µm from the surface) could not be clearly attributed to a predominant effect of UV light, and were probably controlled by hydrolytic processes. 100 hours of exposure enabled the effectiveness of several treatments to be established. The clear stain, enriched with a UV absorber (Tinuvin 1130. Ciba) and a hindered amine light stabiliser (HALS compound type) (Tinuvin 292, Ciba), was shown to offer the best protection of the treatments studied. Impregnation with aqueous solutions of chromium (VI) trioxide and Fe(III) nitrate proved ineffective in photostabilising the wood surface.Note de contenu : - EXPERIMENTAL : Materials - Tensile strength measurements
- MATERIALS AND SUPPLIERS : Chemical treatments - Preparation of free films of coatings - Composing the bundles of thin strips - Artificial weathering - Cutting of strips (or preparing the test specimens)
- Table 1 : Composition of strip packs
- Table 2 : The effect of a ferric nitrate and chromium oxide treatments on the tensile strength of thin fir-wood strips before and after UV-exposure in a QUV artificial weathering tester for 100 hours and 5OO hoursDOI : 10.1007/BF02699671 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699671.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5443
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B4 (12/2004) . - p. 241-247[article]Réservation
Réserver ce documentQuality assurance for exterior wood coatings through European and British standards / E. R. Miller in SURFACE COATINGS INTERNATIONAL. PART A : COATINGS JOURNAL, Vol. 89, A2 (03/2006)
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Titre : Quality assurance for exterior wood coatings through European and British standards Type de document : texte imprimé Auteurs : E. R. Miller, Auteur ; J. A. Graystone, Auteur Année de publication : 2006 Article en page(s) : p. 96-99 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : It was once relatively easy to buy paint or varnish with a clear expectation of what the product would be. During the last 30 years, however, extensive development work within the surface coatings industries has resulted in a vastly increased range of proprietary coatings, often described in pseudo-technical terms or by non-descriptive brand names. This is partly a result of advances in technology, which may require a new vocabulary, but also the understandable desire of manufacturers to differentiate their products in the marketplace. The overall effect has been to create uncertainty on the part of users as to the most suitable types of product for a given situation. In addition, it has become almost impossible to quantify different levels of performance, appearance and cost effectiveness. Note de contenu : - Guide to classification and selection (EN 927 part 1)
- Performance specification (prEN 974 Part 2)
- Test methods (EN 927 Parts 3 to 7)
- Resistance to natural weathering (EN 927-3)
- Permeability tests (EN 927 Parts 4 and 5)
- Artificial weathering test (prEN 927-6)
- Resistance to knot staining (prEN 927-7)
- British standards for exterior wood coatingsEn ligne : https://drive.google.com/file/d/1n_A5WTh1U5jcudIxpYVP5Kcn7cM9tK5g/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16414
in SURFACE COATINGS INTERNATIONAL. PART A : COATINGS JOURNAL > Vol. 89, A2 (03/2006) . - p. 96-99[article]Réservation
Réserver ce documentWood substrate - The foundation / E. R. Miller in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)
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Titre : Wood substrate - The foundation Type de document : texte imprimé Auteurs : E. R. Miller, Auteur Année de publication : 2005 Article en page(s) : p. 157-161 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assurance qualité
Bois -- Revêtements
Humidité -- Absorption:Eau -- Absorption
Revêtements -- Entretien et réparations:Peinture -- Entretien et réparations
TaninsIndex. décimale : 667.9 Revêtements et enduits Résumé : Cost-effective protection for the wood substrate is the foundation for ensuring the successful performance of exterior wood components. However, notwithstanding the considerable research and development efforts in the coatings industries during the last two decades, the fundamental problems of protecting the wood substrate against surface weathering and water entry remain as challenging as ever. This paper will focus on two main issues: water entry into wood and the performance of maintenance paint systems. The benefits of end-grain sealing will be reviewed, and results of recent Building Research Establishment (BRE) work into the relationship between coating permeability and moisture content in the wood will be presented. It will be argued that most modern coatings fail to control adequately moisture content fluctuations in the surface layers of the wood, and that this is detrimental for the long-term performance of the wood and coating alike. The need for ‘robust’ maintenance coatings possessing improved tolerance to imperfect surfaces and for quality assurance for wood coatings will also be discussed. Note de contenu : - Substrate factors affecting joinery performance : Tannin staining - Susceptibility of wood surfaces to photodegradation - Water absorption into wood
- Relation between coating permeability and wood moisture content in service
- Maintenance painting
- Quality assurance for wood coatingsDOI : 10.1007/BF02699567 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699567.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5410
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B3 (09/2005) . - p. 157-161[article]Réservation
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