ASTM_D_6958_-_03_2014.pdf

Designation:D695803(Reapproved 2014)Standard Test Methods forEvaluating Side-Bonding Potential of Wood Coatings1This standard is issued under the fixed designation D6958;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last 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 These test methods describe an evaluation procedure forthe determination of undesirable side-bonding of coatings forwood flooring.They provide two mechanical properties testsfor the quantitative determination of the cohesive strength ofwood coatings(tensile and lap shear);they also provide a woodfloor simulation test for the qualitative determination of side-bonding potential of wood coatings.1.2 The values stated in inch-pound units 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.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility 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:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD2370 Test Method for Tensile Properties of Organic Coat-ingsD4444 Test Method for Laboratory Standardization andCalibration of Hand-Held Moisture Meters2.2 British Standards:3B.S.1204 British Standard Test for Synthetic Resin Adhe-sives2.3 Maple Flooring Manufacturers Association(MFMA):4Guide Specification for Double Plywood Floor SystemGuide Specification for Sleeper and Sleeper with PlywoodFloor Systems2.4 Wood Flooring Manufacturers Association(NOFMA):5Cracks in Hardwood Floors2.5 National Wood Flooring Association(NWFA):6Hardwood Floors Trouble Shooting Manual3.Terminology3.1 Definitions:3.1.1 Definitions used in these test methods are in accor-dance with terminology used in Terminology D9.Afew relatedterms not covered in these test methods are as follows:3.1.2 panelizationadjacent boards acting as a compositepanel instead of individual strips when subjected to changes intemperature and humidity as well as other site conditions.3.1.3 panelization failurethe condition where localizedexcessive gaps beyond specified limits develop between somestrip flooring boards due to panelization.3.1.4 percent wood failurethe rupturing of wood fibers instrength tests on bonded specimens usually expressed as thepercentage of total area involved,which shows such failure.The inverse of adhesive failure.3.1.5 side-bondingthe bonding of adjacent strips of woodflooring caused by the floor coating resulting in panelization.This is one possible cause of panelization failure.3.1.6 side-bonding wood failurethe failure of the woodwithin a strip,as in classic wood failure,when the movementof the strip within the floor is restrained from moisture-relatedmovement by excessive side-bonding.In this situation,thetoughness or“work-to-break”of the side-bonding is sufficientto overcome the tensile strength perpendicular to the grain ofthe wood strip.1These test methods are under the jurisdiction of ASTM Committee D07 onWood and are the direct responsibility of Subcommittee D07.01 on FundamentalTest Methods and Properties.Current edition approved Aug.1,2014.Published August 2014.Originallyapproved in 2003.Last previous edition approved in 2009 as D6958 03(2009).DOI:10.1520/D6958-03R14.2For 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 onthe ASTM website.3Available from British Standards Institute(BSI),389 Chiswick High Rd.,London W4 4AL,U.K.,http:/www.bsi-.4Available from the Maple Flooring Manufacturers Association,Inc.(MFMA),111 Deer Lake Road,Suite 100,Deerfield,IL 60015,http:/www.maplefloor.org.5Available from the Wood Flooring Manufacturers Association(NOFMA),formerly known as the National Oak Flooring Manufacturers Association,22 N.Front Street,Suite 1080,Memphis,TN 38103,http:/www.nofma.org.6Available from the National Wood Flooring Association(NWFA),111 Ches-terfield Industrial Boulevard,Chesterfield,MO 63005,http:/www.woodfloors.orgCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.7 tensile stress(nominal)as used in Test MethodD2370,the load per original unit area at which a specimen failsor yields in a tension(pull)test.SECTION IMECHANICAL PROPERTIES TESTSTEST METHOD AMAPLE BLOCK TENSILESTRENGTH TEST4.Significance and Use4.1 This test method was originally designed as a means ofquantitatively measuring the level of adhesion of the wood-wood interface caused by a wood co