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ASTM D7787/D7787M-13(2022)

(Practice)

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

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

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.
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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Dec-2021
ICS
79.060.01 - Wood-based panels in general
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.42 - Architectural Coatings
Current Stage
Ref Project

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ASTM D7787/D7787M-13(2022) - Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural CoatingsASTM D7787/D7787M-13(2022) - Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings
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ASTM D7787/D7787M-13(2022) - Standard Practice for Selecting Wood Substrates for Weathering Evaluations of Architectural Coatings
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7787/D7787M − 13 (Reapproved 2022)
Standard Practice for
Selecting Wood Substrates for Weathering Evaluations of
1
Architectural Coatings
This standard is issued under the fixed designation D7787/D7787M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
1.1 This practice offers guidelines for selecting wood or 2.1 ASTM Standards:
wood composite substrates for the evaluation of specific D4214 Test Methods for Evaluating the Degree of Chalking
weathering performance characteristics of architectural coat- of Exterior Paint Films
ings such as exterior paints, primers, and deck finishes. G147 Practice for Conditioning and Handling of Nonmetal-
lic Materials for Natural and Artificial Weathering Tests
1.2 Proceduresincludeselectingwoodspeciesandchoosing
individual wood test panels through visual examination of the
3. Terminology
wood characteristics.
3.1 Definitions:
1.3 This practice is intended to cover the most commonly
3.1.1 weathering performance characteristic, n—an attri-
employed wood substrates used in weathering studies of
butedisplayedbyacoatingafteraperiodofexposuretonatural
architectural coatings. It is not intended to serve as a compre-
sunlight, UV light, moisture, varying temperatures or other
hensive guide for all wood species that may be employed for
environmental elements.
the purpose of evaluating weathering performance character-
3.1.1.1 Discussion—Weathering performance characteris-
istics of architectural coatings.
tics may include film integrity attributes such as checking,
1.4 The values stated in either SI units or inch-pound units cracking, peeling, flaking, erosion, chalking; appearance attri-
are to be regarded separately as standard. The values stated in butes such as gloss or color retention; or resistance to dirt
each system are not necessarily exact equivalents; therefore, to pickup, mildew, or algal defacement.
ensure conformance with the standard, each system shall be
3.1.2 wood condition factor, n—an attribute of a wood panel
used independently of the other, and values from the two
that indicates its state prior to being used in a coatings
systems shall not be combined.
performance evaluation.
1.5 This standard does not purport to address all of the 3.1.2.1 Discussion—Wood condition factors may include
safety concerns, if any, associated with its use. It is the duration of time since the panel was milled, chemical pre-
responsibility of the user of this standard to establish appro- treatments, or exposure to environmental elements prior to
priate safety, health, and environmental practices and deter- being coated.
mine the applicability of regulatory limitations prior to use.
3.1.3 wood panel, n—a thin, flat substrate material com-
1.6 This international standard was developed in accor-
posed of any species of wood or wood composite.
dance with internationally recognized principles on standard-
4. Summary of Practice
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.1 The experimenter first determines the critical weather-
mendations issued by the World Trade Organization Technical
ing performance characteristics of the architectural coating
Barriers to Trade (TBT) Committee.
being tested and determines the species and lumber grade of a
wood or wood composite that is similar to the in-service
application of the wood that is to be studied.
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
2
Subcommittee D01.42 on Architectural Coatings. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Jan. 1, 2022. Published January 2022. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2013. Last previous edition approved in 2013 as D7787/D7787M – 13. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D7787_D7787M-13R22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7787/D7787M − 13 (2022)
4.2 Wood species are selected based on the weathering 6.2 Select wood characteristics for the experiment that will
performance characteristics of inter
...

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SCOPE
1.1 This guide establishes the means and frequency of monitoring the neutron exposure of the LWR reactor pressure vessel throughout its operating life.  
1.2 The physics-dosimetry relationships determined from this guide may be used to estimate reactor pressure vessel damage through the application of Practice E693 and Guide E900, using fast neutron fluence (E > 1.0 MeV and E > 0.1 MeV), displacements per atom (dpa), or damage-function-correlated exposure parameters as independent exposure variables. Supporting the application of these standards are the E853, E944, E1005, and E1018 standards, identified in 2.1.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    12 pages
    English language
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  • Guide
    12 pages
    English language
    sale 15% off