ASTM_D_4776_-_D_4776M_-_18.pdf

Designation:D4776/D4776M18Standard Test Method forAdhesion of Tire Cords and Other Reinforcing Cords toRubber Compounds by H-Test Procedure1This standard is issued under the fixed designation D4776/D4776M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of adhesion ofreinforcing cords that are bonded to rubber compounds.Thistest method is applicable to textile cord structures from bothnatural and manmade fibers,other than steel.For adhesiontesting of steel tire cords,refer to Test Method D2229.1.2 This test method is primarily used to evaluate tire cords,using a suitable tire cord adhesive and a suitable rubbercompound.This test method is also used to evaluate(1)tirecord adhesives,and(2)the process of adhesive reaction on thecord using one consistent form of tire cord and one consistentrubber compound.This test method may be used to evaluatecords in industrial hose and belting products and other cordreinforced rubber products.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 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.1.5 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:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1566 Terminology Relating to RubberD2229 Test Method for Adhesion Between Steel Tire Cordsand RubberD6477 Terminology Relating to Tire Cord,Bead Wire,HoseReinforcing Wire,and Fabrics3.Terminology3.1 Definitions:3.1.1 For definitions of terms relating to tire cord,bead wire,hose wire,and tire cord fabrics,refer to Terminology D6477.3.1.1.1 The following terms are relevant to this standard:adhesion,adhesion,in tire fabrics,cord,curing,H-testadhesion,industrial yarn,reinforcing cord,rubber,rubbercompound,as used in the manufacture of rubber articles,vulcanization.3.1.2 For definitions of other terms relating to rubber,referto Terminology D1566.3.1.3 For definitions of other textile terms related to textiles,refer to Terminology D123.4.Summary of Test Method4.1 A cord specimen is sandwiched between two layers ofrubber compound test stock in a form resembling an“H,”placed in a heated mold,and cured at a specified temperatureand pressure.The test specimen sandwich is then cut to createan H-test specimen consisting of a single cord with each endembedded in the center of a tab end of the rubber test block(Fig.1).The test specimen is placed in the grips of the tensiletester,and then the grips are separated.The maximum forceobtained is the H-test adhesion force.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.19 on Industrial Fibers andMetallic ReinforcementsCurrent edition approved Jan.1,2018.Published February 2018.Originallyapproved in 1988.Last previous edition approved in 2010 as D4776 10.DOI:10.1520/D4776-18.2For 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.1 5.Significance and Use5.1 Test Method D4776 for the determination of the H-testadhesion of reinforcing cords to rubber compounds may beused for the acceptance testing of commercial shipments ofreinforcing cords but caution is advised since informationabout between-laboratory precision is incomplete.Compara-tive tests as directed in 5.1.1 may be advisable.5.1.1 In cases of dispute arising from the differences inreported test resul