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Last Updated: Jan 26, 2022
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ASTM D7787/D7787M-13
Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings
Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings
D7787_D7787M-13
ASTM|D7787_D7787M-13|en-US
Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings
Standard
D7787/D7787M Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings>
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BOS Vol. 06.02 Committee D01
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Significance and Use
5.1 Natural weathering tests can take several years and accelerated weathering evaluations often run for cycles requiring several weeks or months before obtaining useful data. Correlating wood panels selection with desired weathering performance characteristics assists a coatings experimenter in maximizing information in the desired time frame.
5.2 Because of the long time spans required for exposure testing, it is critical to plan a reliable experiment while controlling as many variables as possible. For this reason, selection of experimental panels made from representative wood species or composites, grades of lumber and surface types that are expected to be painted is very important.
Scope
1.1 This practice offers guidelines for selecting wood or wood composite substrates for the evaluation of specific weathering performance characteristics of architectural coatings such as exterior paints, primers, and deck finishes.
1.2 Procedures include selecting wood species and choosing individual wood test panels through visual examination of the wood characteristics.
1.3 This practice is intended to cover the most commonly employed wood substrates used in weathering studies of architectural coatings. It is not intended to serve as a comprehensive guide for all wood species that may be employed for the purpose of evaluating weathering performance characteristics of architectural coatings.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.