1、Designation: D 358 98 (Reapproved 2006)Standard Specification forWood to Be Used as Panels in Weathering Tests ofCoatings1This standard is issued under the fixed designation D 358; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification designa
3、tes woods for weathering testsof exterior solvent-borne or water-borne paints and othermaterials of similar purpose. Such tests may include eitheroutdoor exposure tests or accelerated laboratory tests. It is thepurpose of this specification to minimize the influence ofvariation of wood of a given sp
4、ecies on test results.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2D 3924 Specification for Environment for Conditioning andTesting Paint, Varnish, Lacquer, and Related Material
5、s3. General Considerations3.1 A variety of different species should be used for testingfinishes because of the wide variations in the anatomy and thedensity between wood species. The factors have tremendousinfluences on finish performance. Latewood band width anddensity are especially important to f
6、inish performance, andthese parameters vary significantly between wood species.Cedar and redwood have relatively low proportions of hardsummerwood distributed in narrow bands and contain extrac-tives that discolor some paint films. Southern pine has a largeproportion of hard summerwood in wide bands
7、.3.2 The angle between the growth rings and the surface ofthe specimen is very critical to finish performance. Commer-cial practice utilizes the following classification system.Boards in which growth form an angle of less than 30 with thewide surface of the piece are said to be flat-sawn or flat-gra
8、ined; those with the rings intersecting at angles between 30and 60 are termed bastard-sawn; and those with angles greaterthan 60 are termed quarter-sawn, edge grain, or vertical grain.3.3 Some industrial processors of wood products may uti-lize wood at moisture levels significantly higher than theeq
9、uilibrium moistures cited in this specification. In thesespecific cases, appropriately higher moisture content panelsmay be prepared for testing of factory applied finishes.WESTERN RED CEDAR4. Species4.1 The material for test panels shall be western red cedar(Thuja plicata).5. Weight per Volume5.1 W
10、hen the wood is in equilibrium with air at 60 to 65 %relative humidity and 21 6 0.5C (70 6 1F) it shall weigh 350to 370 kg/m3(22 to 23 lb/ft3)orat506 5 % relative humidityand 23 6 2C (73.5 6 3.5F), which are specified inSpecification D 3924 as standard conditions for testing paintand related coating
11、s, it shall weigh 343 to 359 kg/m3(21.4 to22.4 lb/ft3).NOTE 1The density requirement is to eliminate wood specimens thatvary greatly from the average for that species. Either set of conditions maybe used to establish the density. At 60 to 65 % relative humidity wood hasa moisture content of approxim
12、ately 12 % while at 45 to 55 % relativehumidity it contains 9 to 10 %. The former is closer to the moisturecontent of wood exposed to most exterior climatic conditions.6. Character of Wood6.1 The wood shall be heartwood having edge grain andshall be free of knots and other defects. The color of the
13、woodshall be uniform across each panel with no streaks that areexcessively light or dark. The number of annual growth ringsper inch along the radius of the log from which the wood wasobtained shall not be less than ten. The surfaces shall be1This specification is under the jurisdiction of ASTM Commi
14、ttee D01 on Paintand Related Coatings, Materials and Applications and is the direct responsibilityD01.42 on Architectural Coatings.Current edition approved Aug. 1, 2006. Published August 2006. Originallyapproved in 1933. Last previous edition approved in 1998 as D 358 98.2For referenced ASTM standar
15、ds, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
16、19428-2959, United States.smoothly planed and sanded thoroughly with 150 grit sandpa-per within two weeks of testing.7. Thickness of Panels7.1 The minimum thicknesses (Note 2) in proportion towidth (across the grain) shall be as follows:Panel Width, mm (in.)Minimum Thickness, mm(in.)Less than 75 (le
17、ss than 3) 10 (38)75 to 150 (3 to 6 ) 11 (716)Over 150 (over 6) 19 (34)NOTE 2 Minimum thicknesses in proportion to width (across thegrain) do not apply to panels made of clapboard or siding of commercialtypes, which shall be used as regularly marketed.WHITE PINE AND PONDEROSA PINE8. Species8.1 White
18、 pine wood shall be northern white pine (Pinusstrobus). Western white pine (Pinus monticola), or sugar pine(Pinus lambertiana). Western white pine is sometimes calledIdaho white pine. Ponderosa pine wood shall be Pinus ponde-rosa.9. Weight per Volume9.1 When the wood is in equilibrium with air at 60
19、 to 65 %relative humidity and 21 6 0.5C (70 6 1F) it shall weigh 370to 430 kg/m3(23 to 27 lb/ft3)orat506 5 % relative humidityand 23 6 2C (73.5 6 3.5F) it shall weigh 359 to 423kg/m3(22.4 to 26.4 lb/ft3). (See Note 1.)10. Character of Wood10.1 The wood shall be free of knots, pitch pockets, andother
20、 defects. The color of the wood shall be uniform acrosseach panel with no streaks that are excessively light or dark.The number of annual growth rings per inch along the radius ofthe log from which the wood was obtained shall be not lessthan 15. The surfaces shall be smoothly planed and sandedthorou
21、ghly with 150 grit sandpaper within two weeks oftesting.10.2 The wood shall be selected as edge grain or flat grainas desired. The test surface of flat grain wood shall be on thebark side.11. Thickness of Panels11.1 The minimum thicknesses (see Note 2) in proportion towidth (across the grain) shall
22、be as follows:Panel Width, mm (in.)Minimum Thickness, mm(in.)Less than 75 (less than 3) 11(716)75 to 150 (3 to 6) 11 (716)Over 150 (over 6 ) 19 (34)SOUTHERN PINE12. Species12.1 The material for test panels shall be southern pine(Pinus sp.), suitable for siding purposes. It is not to be limitedto a s
23、ingle species, but shall conform to the requirementsprescribed in Section 13 and Section 14.13. Weight per Volume13.1 When the wood is in equilibrium with air at 60 to 65 %relative humidity and 21 6 0.5C (70 6 1F) it shall weigh 510to 610 kg/m3(32 to 38 lb/ft3)orat506 5 % relative humidityand 23 6 2
24、C (73.5 6 3.5F) it shall weigh 500 to 590kg/m3(31 to 37 lb/ft3). (See Note 2.)14. Character of Wood14.1 The wood shall be free of knots, pitch pockets, andother defects. The color of the wood shall be uniform acrosseach panel with no streaks that are excessively light or dark.The number of annual gr
25、owth rings per inch along the radius ofthe log from which the wood was obtained shall be not lessthan 4 nor more than 12. The surfaces shall be smoothly planedand sanded thoroughly with 150 grit sandpaper within twoweeks of testing.14.2 The wood shall be sapwood having flat grain.15. Thickness of Pa
26、nels15.1 The minimum thicknesses (see Note 2) in proportion towidth (across the grain) shall be as follows:Panel Width, mm (in.)Minimum Thickness, mm(in.)Less than 75 (less than 3) 11(716)75 to 150 (3 to 6) 11 (716)Over 150 (over 6) 19 (34)REDWOOD16. Species16.1 The material for test panels shall be
27、 redwood (Sequoiasempervirens).17. Weight per Volume17.1 When the wood is in equilibrium with air at 60 to 65 %relative humidity and 21 6 0.5C (70 6 1F) it shall weigh 450to 460 kg/m3(28 to 29 lb/ft3)orat506 5 % relative humidityand 23 6 2C (73.5 6 3.5F) it shall weigh 436 to 452kg/m3(27.2 to 28.2 l
28、b/ft3). (See Note 1.)18. Character of Wood18.1 The material shall be heartwood, as nearly edge grainas possible. The number of annual growth rings per inch alongthe radius of the log from which the wood was obtained shallbe not less than 18. The wood shall be free of knots, oil streaks,and other def
29、ects such as wavy burl grain. The color of thewood shall be uniform across each panel with no streaks thatare excessively light or dark. The surfaces shall be smoothlyplaned and sanded thoroughly with 150 grit sandpaper withintwo weeks of testing.19. Thickness of Panels19.1 The minimum thicknesses (
30、see Note 2) in proportion towidth (across the grain) shall be as follows:Panel Width, mm (in.)Minimum Thickness, mm(in.)Less than 75 (less than 3) 10 (38)75 to 150 (3 to 6) 11 (716)Over 150 (over 6) 19 (34)D 358 98 (2006)2DOUGLAS FIR20. Species20.1 The material for test panels shall be Douglas fir(P
31、seudotsuga menziesii).21. Weight per Volume21.1 When the wood is in equilibrium with air at 60 to 65 %relative humidity and 21 6 0.5C (70 6 1F) it shall weigh 480to 580 kg/m3(30 to 36 lb/ft3)orat506 5 % relative humidityand 23 6 2C (73.5 6 3.5F) it shall weigh 460 to 560kg/m3(29 to 35 lb/ft3). (See
32、Note 1.)22. Character of Wood22.1 The wood shall be free of knots, pitch pockets, andother defects. The color of the wood shall be uniform acrosseach panel with no streaks that are excessively light or dark.The number of annual growth rings per inch along the radius ofthe log from which the wood was
33、 obtained shall be not lessthan ten. The surfaces shall be smoothly planed and sandedthoroughly with 150 grit sandpaper within two weeks oftesting.22.2 The wood shall be heartwood and selected as edgegrain or flat grain as desired. The test surface of flat grain woodshall be on the bark side.23. Thi
34、ckness of Panels23.1 The minimum thicknesses (see Note 2) in proportion towidth (across the grain) shall be as follows:Panel Width, mm (in.)Minimum Thickness, mm(in.)Less than 75 (less than 3) 11(716)75 to 150 (3 to 6) 11 (716)Over 150 (over 6) 19 (34)24. Keywords24.1 weathering; wood coatings; wood
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36、ts, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional
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38、Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 358 98 (2006)3
