ASTM_D_3767_-_03_2020.pdf

Designation:D376703(Reapproved 2020)Standard Practice forRubberMeasurement of Dimensions1This standard is issued under the fixed designation D3767;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.1.Scope1.1 This practice is intended for use in determining thegeometrical dimensions of rubber products and specimens forphysical tests.This practice describes procedures for determin-ing length,width,thickness,diameter,and circumference.Thispractice does not cover sampling of materials or products,orlocations where a sample is to be taken.1.2 The values stated in either acceptable metric units or inother units shall be regarded separately as a standard.Thevalues stated in each system may not be exact equivalents;therefore,each system must be used independently of the other,without combining values in any other way.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:2D1415 Test Method for Rubber PropertyInternationalHardnessD3183 Practice for RubberPreparation of Pieces for TestPurposes from Products3.Summary of Practice3.1 Specific procedures are outlined depending upon size,texture,and shape of the test specimens undergoing measure-ment.3.1.1 Procedure A encompasses linear dimensions up to 30mm using a flat-footed micrometer on flat sheets and testspecimens.3.1.2 Procedure A1 encompasses thickness dimensions upto 30 mm using a micrometer with contact members that aredomed surfaces.This procedure is employed on irregularlyshaped test specimens and compression set test specimens.3.1.3 Procedure A2 encompasses thickness measurementsof flexible cellular test specimens up to 30 mm using amicrometer with large area flat contact members.3.1.4 Procedure B encompasses linear dimensions between30 and 100 mm using a vernier caliper.3.1.5 Procedure C encompasses linear dimensions above100 mm using a tape or linear scale.3.1.6 Procedure D encompasses thickness measurements onsoft thin materials using a microscope.3.1.7 Procedure E encompasses circumference measure-ments by cone.4.Significance and Use4.1 Dimensional measurements specified in this practice aremade for one of the following purposes:(1)to determineconformance with specification requirements regarding geo-metrical properties of whole units,such as the size of rubbergloves,or the diameter and circumference of rubber hose,(2)to determine conformance with specification requirementsregarding particular functional parts of units,such as thethickness of the soles of boots,or(3)to determine geometricalvalues that are necessary in the calculation of test results forphysical properties for which requirements are specified,suchas the thickness of a test specimen for tensile strength.Themethod to be used shall be as specified in the detail specifica-tion or appropriate test method.4.2 Pressure applied by measuring instruments has a signifi-cant effect on the observed thickness of soft flexible materials,and it is therefore necessary to specify the pressure imposed bythe foot of the instrument on the test piece for accuratecomparative measurements of such materials.1This practice is under the jurisdiction ofASTM Committee D11 on Rubber andRubber-like Materials and is the direct responsibility of Subcommittee D11.10 onPhysical Testing.Current edition approved Feb.1,2020.Published February 2020.Originallyapproved in 1979.Last previous edition approved in 2014 as D3767 03(2014).DOI:10.1520/D3767-03R20.2For 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.5.Test Specimens5