1、Designation:D540103(Reapproved 2014)Standard Test Method forEvaluating Clear Water Repellent Coatings on Wood1This standard is issued under the fixed designation D5401;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method evaluates the effectiveness of clearwater repellent coatings on wood before or after exteriorexposure.1.2 Intra
3、laboratory results with this test method can be usedto compare the effectiveness of clear water repellent coatings.The agreement between results obtained in different laborato-ries may be less satisfactory unless a known water repellent isused as a reference.1.3 The values stated in inch-pound units
4、 are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility
5、of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D358 Specification for Wood to Be Used as Panels inWeathering Tests of Coatings(Withdrawn 2014)3D1006 P
6、ractice for Conducting Exterior Exposure Tests ofPaints on WoodD1193 Specification for Reagent WaterD3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related Materials3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 clear water repellent c
7、oating,na transparent coatingformulated for the purpose of protecting porous substrates bypreventing the penetration of liquid water.4.Summary of Test Method4.1 Five Ponderosa pine specimens are treated with the clearwater repellent under test and allowed to dry for seven days.Five untreated specime
8、ns serve as controls.The treated anduntreated specimens are each weighed and then allowed to floatin water for 30 min.The specimens are removed,the excesswater is wiped off,and each are reweighed.The effectivenessof the water repellent coating is then calculated.5.Significance and Use5.1 Water is kn
9、own to penetrate wood substrates,causingdimensional instability and eventual deterioration.Clear waterrepellent coatings are designed to protect wood from damagingeffects of water.This test method is used to evaluate theeffectiveness of water repellent coatings on wood soon afterapplication or after
10、 long-term exterior exposure.6.Apparatus6.1 Conditioning Room or Chamber,having a controlledtemperature of 73.5 6 3.5F(23 6 2C)and a controlledrelative humidity of 50 6 5%as described in SpecificationD3924.This is used to establish a uniform moisture content inthe test specimens and during the test.
11、6.2 Balance,accurate to at least 0.1 g.6.3 Saw,sharp,fine-toothed,with a minimum of ten teeth/in.to obtain a smooth surface on the test specimen.7.Reagents and Materials7.1 Purity of WaterUnless otherwise clearly indicated,references to water shall be understood to mean reagent wateras defined by Ty
12、pe IV of Specification D1193.7.2 WoodWood used for these tests shall be randomlyselected standard commercial“two-by-fours,”straight-grained,knot-free,flat-sawn,kiln-dried,Ponderosa pine sapwood,se-lected in accordance with Specification D358.NOTE1Species other than Ponderosa pine may be used by mutu
13、alagreement.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 199
14、3.Last previous edition approved in 2009 as D5401 03(2009).DOI:10.1520/D5401-03R14.2For referenced ASTM standards,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 on
15、the ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Test Specimens8.1 Cut away and discard 3 in.(76 mm)of end grain fromthe selected“two-by
16、-four”to avoid any pretreatment that mayhave been applied by the supplier and to ensure an even cut onevery specimen.8.2 Using the fine-toothed saw(see 6.3)to ensure a smoothsurface,cut a supply of 12 in.(305 mm)long test specimenssufficient for the intended test program,with an ample overageto allow for possible discards.Five specimens are required foreach water repellent being tested and five for an untreatedcontrol set.8.3 Weigh each specimen to 0.1 g and calculate the meanweight.Discard spec
