ASTM_D_906_-_98_2011.pdf

Designation:D90698(Reapproved 2011)Standard Test Method forStrength Properties of Adhesives in Plywood TypeConstruction in Shear by Tension Loading1This standard is issued under the fixed designation D906;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.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONThe accuracy of the results of strength tests of adhesive bonds will depend 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 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 bond line,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.Arange may be prescribed for any variable by the manufacturer of the adhesive if it can be assumedby the test operator that any arbitrarily chosen value within such a range or any combination of suchvalues for several variables will be acceptable to both the manufacturer and the purchaser of theadhesive.1.Scope1.1 This test method covers the determination of the com-parative shear strengths of adhesives in plywood-typeconstruction,when tested on a standard specimen and underspecified conditions of preparation,conditioning,and testing.This test method is intended to be applied only to adhesivesused 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 provided forinformation purposes only.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:2D143 Test Methods for Small Clear Specimens of TimberD907 Terminology of Adhesives3.Terminology3.1 Definitions:1This 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 1,2011.Published April 2011.Originallyapproved in 1947.Last previous edition approved in 2004 as D906 98(2004).DOI:10.1520/D0906-98R11.2For 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 States1 3.1.1 Many terms in this test method are defined in Termi-nology D907.3.1.2 plywood,na panel generally flat built up of layers ofveneer called plies,united under pressure by an adhesive tocreate a panel with the bond between the plies as strong as,orstronger than,the wood,and that has the following character-istics:(1)is constructed of an odd number of layers with grainof adjacent layers perpendicular,(2)with a layer consisting ofeither a single ply or two or more plies laminated with parallelgrain direction,and(3)with outer layers and all odd numberedlayers generally having the grain direction oriented parallel tothe long dimension of the panel.3.1.2.1 DiscussionGenerally,the grain of one or moreplies is approximately at right angles to the other plies,andalmost always an odd number of plies are used.3.1.3 shear,nin an adhesively bonded joint,stress,strainor failure resulting from applied forces that tend to causeadjacent planes of a body to slide parallel in opposite direc-tions.4.Significance and Use4.1 The way adhesives are used in plywood makes shearstrength an important performance criteria.4.2 Shear strength measured by this test is suitable for