ASTM_D_6958_-_20.pdf

Designation:D695820Standard 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).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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD2370 Test Method for Tensile Properties of Organic Coat-ingsD7438 Practice for Field Calibration and Application ofHand-Held Moisture MetersE4 Practices for Force Verification of Testing Machines2.2 Maple Flooring Manufacturers Association(MFMA):3Grading Rules for MFMA Hard Maple2.3 National Wood Flooring Association(NWFA):4Technical Publication C200 Problems,Causes,and Cures3.Terminology3.1 DefinitionsFor general definitions of terms related towood,refer to Terminology D9.3.2 Definitions of Terms Specific to This Standard:3.2.1 panelizationcondition caused by side-bonding,ex-cessive installation adhesive,substrate movement,or otherfactors where localized gaps develop between flooring stripswhile adjacent boards remain in tight contact acting as acomposite panel instead of individual strips.3.2.2 panelization failurecondition where localized exces-sive gaps beyond specified limits develop between some stripflooring boards due to panelization.3.2.3 percent wood failurerupturing of wood fibers instrength tests on bonded specimens usually expressed as thepercentage of total area involved which shows such failure andis the inverse of adhesive failure.3.2.4 side-bondingbonding of adjacent strips of woodflooring caused by the floor coating resulting in panelization.3.2.4.1 DiscussionSide-bonding is most commonlycaused when installed wood flooring boards have becomeadhered to each other.Finish materials,especially water-basedproducts,that have seeped between the boards,and the glueused on the flooring tongue-and-groove joint are two commonsources of side-bonding.Side-bonding wood failure can occuras side-bonded flooring boards shrink due to loss of moistureafter installation.3.2.5 side-bonding wood failurefailure of the wood withina strip,as in classic wood failure,when the movement of thestrip within the floor is restrained from moisture-relatedmovement by side-bonding and the resulting stress overcomesthe tensile strength perpendicular to the grain of the wood strip.3.2.6 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.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 Oct.1,2020.Published October 2020.Originallyapproved in 2003.Last previous edition approved in 2014 as D6958 03(2014).DOI:10.1520/D6958-20.2For 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 the Maple Flooring Manufacturers Association,Inc.(MFMA),1425 Tri State Parkway,Suite 110,Gurnee,IL 60031,http:/www.maplefloor.org.4Available from the National Wood Flooring Association(NWFA),111 Ches-terfield Industrial Boulevard,Chesterfield,MO 63005,http:/www.nwfa.orgCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendation