ASTM_D_2339_-_20.pdf

Designation:D233920Standard Test Method forStrength Properties of Adhesives in Two-Ply WoodConstruction in Shear by Tension Loading1This standard is issued under the fixed designation D2339;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.INTRODUCTIONThe accuracy of the results of strength tests of adhesive bonds depends on the conditions underwhich the bonding process is carried out.Unless otherwise agreed upon between the manufacturer andthe purchaser,the bonding conditions shall be prescribed by the manufacturer of the adhesive.In orderto ensure that complete information is available to the individual conducting the tests,themanufacturer of the adhesive shall furnish numerical values and other specific information for each ofthe following variables:(1)The moisture content of the wood at the time of bonding.(2)Complete mixing directions for the adhesive.(3)Conditions for application of the adhesive including the rate of spread or thickness of film,number of coats to be applied,whether to be applied to one or both surfaces and the conditions ofdrying where more than one coat is required.(4)Assembly conditions before application of pressure,including the room temperature,length oftime,and whether open or closed assembly is to be used.(5)Curing conditions,including the amount of pressure to be applied,the length of time underpressure,and the temperature of the assembly when under pressure.It should be stated whether thistemperature is that of the bondline,or of the atmosphere at which the assembly is to be maintained.(6)Conditioning procedure before testing,unless a standard procedure is specified,including thelength of time,temperature,and relative humidity.A range for any variable or combination of variables is permitted provided any arbitrarily chosenvalue within the range or combinations specified is acceptable to both the manufacturer and thepurchaser of the adhesives.1.Scope1.1 This test method covers the determination of the com-parative shear strengths of adhesives when tested on a standardspecimen and under specified conditions of preparation,conditioning,and testing.This test method is intended to beapplied only to adhesives used in bonding wood to wood.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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:2D907 Terminology of Adhesives1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.30 on WoodAdhesives.Current edition approved April 1,2020.Published April 2020.Originallyapproved in 1965.Last previous edition approved in 2017 as D2339 98(2017).DOI:10.1520/D2339-20.2For 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.Copyright 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 Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.D1038 Terminology Relating to Veneer,Plywood,and WoodStructural PanelsD4442 Test Methods for Direct Moisture Content Measure-ment of Wood and Wood-Based MaterialsD5266 Practice for Estimating the Percentage of WoodFailure in Adhesive Bonded Joints3.Terminology3.1 Definitions:3.1.1 Many terms in this test method are defined in Termi-nology D907 and D1038.3.1.2 shear,nin an adhesively bonded joint,stress,strain,or failure resulting from applied forces that tends to causeadjacent planes of a body to slide parallel in opposite direc-tions.4.Significance and Use4.1 By the nature of the way adhesives are used in two-plywood construction,shear strength is an important performancecriteria.4.2 Shear strength measured by this test method is suitablefor use in adhesive deve