ASTM D5401-03(2008)
(Test Method)Standard Test Method for Evaluating Clear Water Repellent Coatings on Wood
Standard Test Method for Evaluating Clear Water Repellent Coatings on Wood
SIGNIFICANCE AND USE
Water is known to penetrate wood substrates, causing dimensional instability and eventual deterioration. Clear water repellent coatings are designed to protect wood from damaging effects of water. This test method is used to evaluate the effectiveness of water repellent coatings on wood soon after application or after long-term exterior exposure.
SCOPE
1.1 This test method evaluates the effectiveness of clear water repellent coatings on wood before or after exterior exposure.
1.2 Intralaboratory results with this test method can be used to compare the effectiveness of clear water repellent coatings. The agreement between results obtained in different laboratories may be less satisfactory unless a known water repellent is used as a reference.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety problems, 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.
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Designation:D5401–03(Reapproved2008)
Standard Test Method for
Evaluating Clear Water Repellent Coatings on Wood
This standard is issued under the fixed designation D 5401; 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 4. Summary of Test Method
1.1 This test method evaluates the effectiveness of clear 4.1 FivePonderosapinespecimensaretreatedwiththeclear
water repellent coatings on wood before or after exterior water repellent under test and allowed to dry for seven days.
exposure. Five untreated specimens serve as controls. The treated and
1.2 Intralaboratory results with this test method can be used untreatedspecimensareeachweighedandthenallowedtofloat
to compare the effectiveness of clear water repellent coatings. in water for 30 min. The specimens are removed, the excess
The agreement between results obtained in different laborato- water is wiped off, and each are reweighed. The effectiveness
ries may be less satisfactory unless a known water repellent is of the water repellent coating is then calculated.
used as a reference.
5. Significance and Use
1.3 The values stated in inch-pound units are to be regarded
5.1 Water is known to penetrate wood substrates, causing
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only dimensional instability and eventual deterioration. Clear water
repellent coatings are designed to protect wood from damaging
and are not considered standard.
1.4 This standard does not purport to address all of the effects of water. This test method is used to evaluate the
effectiveness of water repellent coatings on wood soon after
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- application or after long-term exterior exposure.
priate safety and health practices and determine the applica-
6. Apparatus
bility of regulatory limitations prior to use.
6.1 Conditioning Room or Chamber, having a controlled
2. Referenced Documents
temperature of 73.5 6 3.5°F (23 6 2°C) and a controlled
2.1 ASTM Standards: relative humidity of 50 6 5 % as described in Specification
D 358 Specification for Wood to Be Used as Panels in D 3924. This is used to establish a uniform moisture content in
the test specimens and during the test.
Weathering Tests of Coatings
D 1006 Practice for Conducting Exterior Exposure Tests of 6.2 Balance, accurate to at least 0.1 g.
6.3 Saw, sharp, fine-toothed, with a minimum of ten teeth/
Paints on Wood
D 1193 Specification for Reagent Water in. to obtain a smooth surface on the test specimen.
D 3924 Specification for Environment for Conditioning and
7. Reagents and Materials
Testing Paint, Varnish, Lacquer, and Related Materials
7.1 Purity of Water—Unless otherwise clearly indicated,
3. Terminology
references to water shall be understood to mean reagent water
3.1 Definitions of Terms Specific to This Standard: as defined by Type IV of Specification D 1193.
7.2 Wood—Wood used for these tests shall be randomly
3.1.1 clear water repellent coating, n—atransparentcoating
formulated for the purpose of protecting porous substrates by selectedstandardcommercial“two-by-fours,”straight-grained,
knot-free, flat-sawn, kiln-dried, Ponderosa pine sapwood, se-
preventing the penetration of liquid water.
lected in accordance with Specification D 358.
NOTE 1—Species other than Ponderosa pine may be used by mutual
This test method is under the jurisdiction of ASTM Committee D01 on Paint
agreement.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.42 on Architectural Coatings.
Current edition approved June 1, 2008. Published June 2008. Originally
approved in 1993. Last previous edition approved in 2003 as D 5401 - 03.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D5401–03 (2008)
8. Test Specimens
where:
A = weight of the untreated specimen after water contact,
8.1 Cut away and discard 3 in. (76 mm) of end grain from
g,
the selected “two-by-four” to avoid any pretreatment that may
B = weight of the untreated specimen before water con-
have been applied by the supplier and to ensure an even cut on
tact, g,
every specimen.
C = weight of the treated specimen after water contact, g,
8.2 Using the fine-toothed saw (see 6.3) to ensure a smooth
and
surface, cut a supply of 12 in. (305 mm) long test specimens
D = weight of the treated specimen before water contract,
sufficient for the intended test program, with an ample overage
g.
to allow for possible discards. Five specimens are required for
11.2 Calculate the mean WRE value for each five-specimen
each water repellent being tested and five for an untreated
set.
control set.
8.3 Weigh each specimen to 0.1 g and calculate the mean
12. Report
weight. Discard specimens that vary more than 10 % from the
12.1 Report the following information:
mean and cut additional specimens as necessary t
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