Authors: Gerhard Grüll Florian Tscherne Irene Spitaler Boris Forsthuber
Publish Date: 2014/04/02
Volume: 72, Issue: 3, Pages: 367-376
Abstract
Panels of pine sapwood coated with 30 different coating systems were exposed to natural weathering in Vienna as well as artificial weathering using fluorescent UVlamps and water The aim was to compare coating durability in natural and artificial weathering in terms of the exposure time until the panels reached a defined limit state where the coatings required maintenance For both weathering methods the durability of the coating systems was influenced by film thickness and for the semitransparent systems also by pigmentation Three opaque coating systems lasted over 10000 h of artificial weathering Comparison of the natural and artificial weathering regarding durability of the coating systems time to limit state with the present results after 30 months natural weathering revealed a nonlinear correlation The collected data can provide a basis for rough service life estimation of exterior wood coatings based on standardised weathering methodsThe results presented in this paper are part of the research project “Maintenance Indicator for Wooden Building Elements” Financial support by the Austrian Research Promotion Agency FFG and the companies Akzo Nobel Coatings GmbH Holz Leeb GmbH Remmers Austria GmbH and Teknos A/S is gratefully acknowledged
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