ASTM D7787 / D7787M - 13

    Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings

    Active Standard ASTM D7787 / D7787M | Developed by Subcommittee: D01.42

    Book of Standards Volume: 06.02


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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.

    5.3 This practice may be used for any types of exterior architectural coating intended for use on wood or wood composite substrate such as exterior house paints, primers, wood stains, or waterproofers.

    1. 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.

    1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D4214 Test Methods for Evaluating the Degree of Chalking of Exterior Paint Films

    G147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests


    ICS Code

    ICS Number Code 79.060.01 (Wood-based panels in general); 87.040 (Paints and varnishes)

    UNSPSC Code

    UNSPSC Code 11121600(Wood)


    DOI: 10.1520/D7787_D7787M

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