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ASTM D358-98(2006)

(Specification)

Standard Specification for Wood to Be Used as Panels in Weathering Tests of Coatings

Standard Specification for Wood to Be Used as Panels in Weathering Tests of Coatings

ABSTRACT
This specification designates woods to be used as panels in weathering tests of coatings such as solvent-borne or water-borne paints. Different wood species shall be considered for testing due to their wide variations in the anatomy and density. Wood species materials for test panels include western red cedar, white pine and Ponderosa pine, southern pine, redwood, and Douglas fir. Wood panel characteristics such as weight per volume, wood character, panel thickness, surface smoothness, relative humidity, and growth rings density shall be in accordance with the specification.
SCOPE
1.1 This specification designates woods for weathering tests of exterior solvent-borne or water-borne paints and other materials of similar purpose. Such tests may include either outdoor exposure tests or accelerated laboratory tests. It is the purpose of this specification to minimize the influence of variation of wood of a given species on test results.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

Status
Historical
Publication Date
31-Jul-2006
ICS
79.060.01 - Wood-based panels in general
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.42 - Architectural Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM D358-98 - Standard Specification for Wood to Be Used as Panels in Weathering Tests of Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
Effective Date
01-Aug-2006
Referred By
ASTM D5031/D5031M-13(2018) - Standard Practice for Enclosed Carbon-Arc Exposure Tests of Paint and Related Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D5324-16(2022) - Standard Guide for Testing Water-Borne Architectural Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D822/D822M-13(2018) - Standard Practice for Filtered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D5146-10(2019) - Standard Guide to Testing Solvent-Borne Architectural Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D3361/D3361M-22 - Standard Practice for Unfiltered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D6695-16 - Standard Practice for Xenon-Arc Exposures of Paint and Related Coatings
Effective Date
01-Aug-2006
Referred By
ASTM D5401-03(2022) - Standard Test Method for Evaluating Clear Water Repellent Coatings on Wood
Effective Date
01-Aug-2006

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ASTM D358-98(2006) - Standard Specification for Wood to Be Used as Panels in Weathering Tests of CoatingsASTM D358-98(2006) - Standard Specification for Wood to Be Used as Panels in Weathering Tests of Coatings
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ASTM D358-98(2006) - Standard Specification for Wood to Be Used as Panels in Weathering Tests of Coatings
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D358 −98(Reapproved2006)
Standard Specification for
Wood to Be Used as Panels in Weathering Tests of
Coatings
This standard is issued under the fixed designation D358; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope wide surface of the piece are said to be flat-sawn or flat-
grained; those with the rings intersecting at angles between 30°
1.1 This specification designates woods for weathering tests
and 60° are termed bastard-sawn; and those with angles greater
of exterior solvent-borne or water-borne paints and other
than 60° are termed quarter-sawn, edge grain, or vertical grain.
materials of similar purpose. Such tests may include either
outdoor exposure tests or accelerated laboratory tests. It is the
3.3 Some industrial processors of wood products may uti-
purpose of this specification to minimize the influence of
lize wood at moisture levels significantly higher than the
variation of wood of a given species on test results.
equilibrium moistures cited in this specification. In these
specific cases, appropriately higher moisture content panels
1.2 The values stated in SI units are to be regarded as
may be prepared for testing of factory applied finishes.
standard. The values given in parentheses are for information
only.
WESTERN RED CEDAR
2. Referenced Documents
4. Species
2.1 ASTM Standards:
4.1 The material for test panels shall be western red cedar
D3924 Specification for Environment for Conditioning and
(Thuja plicata).
Testing Paint, Varnish, Lacquer, and Related Materials
3. General Considerations
5. Weight per Volume
3.1 A variety of different species should be used for testing
5.1 When the wood is in equilibrium with air at 60 to 65 %
finishes because of the wide variations in the anatomy and the
relativehumidityand21 60.5°C(70 61°F)itshallweigh350
3 3
density between wood species. The factors have tremendous
to 370 kg/m (22 to 23 lb/ft )orat50 6 5 % relative humidity
influences on finish performance. Latewood band width and
and 23 6 2°C (73.5 6 3.5°F), which are specified in
density are especially important to finish performance, and
Specification D3924 as standard conditions for testing paint
these parameters vary significantly between wood species.
and related coatings, it shall weigh 343 to 359 kg/m (21.4 to
Cedar and redwood have relatively low proportions of hard
22.4 lb/ft ).
summerwood distributed in narrow bands and contain extrac-
NOTE 1—The density requirement is to eliminate wood specimens that
tives that discolor some paint films. Southern pine has a large
varygreatlyfromtheaverageforthatspecies.Eithersetofconditionsmay
proportion of hard summerwood in wide bands.
be used to establish the density.At 60 to 65 % relative humidity wood has
3.2 The angle between the growth rings and the surface of a moisture content of approximately 12 % while at 45 to 55 % relative
humidity it contains 9 to 10 %. The former is closer to the moisture
the specimen is very critical to finish performance. Commer-
content of wood exposed to most exterior climatic conditions.
cial practice utilizes the following classification system.
Boards in which growth form an angle of less than 30° with the
6. Character of Wood
6.1 The wood shall be heartwood having edge grain and
This specification is under the jurisdiction ofASTM Committee D01 and is the
shall be free of knots and other defects. The color of the wood
direct responsibility D01.42 on Architectural Coatings.
shall be uniform across each panel with no streaks that are
Current edition approved Aug. 1, 2006. Published August 2006. Originally
excessively light or dark. The number of annual growth rings
approved in 1933. Last previous edition approved in 1998 as D358 – 98. DOI:
10.1520/D0358-98R06.
per inch along the radius of the log from which the wood was
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
obtained shall not be less than ten. The surfaces shall be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
smoothly planed and sanded thoroughly with 150 grit sandpa-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. per within two weeks of testing.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D358−98(2006)
7. Thickness of Panels 13. Weight per Volume
7.1 The minimum thicknesses (Note 2) in proportion to 13.1 When the wood is in equilibrium with air at 60 to 65 %
width (across the grain) shall be as follows: relativehumidityand21 60.5°C(70 61°F)itshallweigh510
3 3
to 610 kg/m (32 to 38 lb/ft )orat50 6 5 % relative humidity
Minimum Thickness, mm
Panel Width, mm (in.) (in.)
and 23 6 2°C (73.5 6 3.5°F) it shall weigh 500 to 590 kg/m
(31 to 37 lb/ft ). (See Note 2.)
Less than 75 (less than 3) 10 ( ⁄8)
75 to 150 (3 to 6 ) 11 ( ⁄16)
14. Character of Wood
Over 150 (over 6) 19 ( ⁄4)
14.1 The wood shall be free of knots, pitch pockets, and
NOTE 2— Minimum thicknesses in proportion to width (across the
other defects. The color of the wood shall be uniform across
grain) do not apply to panels made of clapboard or siding of commercial
types, which shall be used as regularly marketed. each panel with no streaks that are excessively light or dark.
Thenumberofannualgrowthringsperinchalongtheradiusof
WHITE PINE AND PONDEROSA PINE
the log from which the wood was obtained shall be not less
than 4 nor more than 12.The surfaces shall be smoothly planed
8. Species
and sanded thorough
...

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