ASTM_D_5947_-_11.pdf

Designation:D594711Standard Test Methods forPhysical Dimensions of Solid Plastics Specimens1This standard is issued under the fixed designation D5947;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.Scope*1.1 These test methods cover determination of the physicaldimensions of solid plastic specimens where the dimensionsare used directly in determining the results of tests for variousproperties.Use these test methods except as otherwise requiredin material specifications.1.2 The values stated in SI units are to be regarded asstandard.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.NOTE1This standard and ISO 16012 address the same subject matter,but differ in technical content.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD883 Terminology Relating to PlasticsD2240 Test Method for Rubber PropertyDurometer Hard-ness2.2 ISO Standards:3ISO 472 PlasticsVocabularyISO 16012 PlasticsDetermination of Linear Dimensionsof Test Specimens3.Terminology3.1 DefinitionsSee Terminology D883 and ISO 472 fordefinitions pertinent to these test methods.3.2 Definitions of Terms Specific to This Standard:3.2.1 absolute uncertainty(of a measurement),nthesmallest division that may be read directly on the instrumentused for measurement.3.2.2 calibrationthe set of operations that establishes,under specified conditions,the relationship between valuesmeasured or indicated by an instrument or system,and thecorresponding reference standard or known values derivedfrom the appropriate reference standards.3.2.3 micrometer,nan instrument for measuring any di-mension within absolute uncertainty of 25 m or smaller.3.2.4 verificationproof,with the use of calibrated stan-dards or standard reference materials,that the calibratedinstrument is operating within specified requirements.3.2.5 1 mil,na dimension equivalent to 25 m(0.0010in.).4.Summary of Test Methods4.1 These test methods provide five different test methodsfor the measurement of physical dimensions of solid plasticspecimens.The test methods(identified as Test Methods Athrough D,and H)use different micrometers that exert variouspressures for varying times upon specimens of different geom-etries.Tables 1 and 2 display the basic differences of each testmethod and identify methods applicable for use on variousplastics materials.5.Significance and Use5.1 These test methods shall be used where precise dimen-sions are necessary for the calculation of properties expressedin physical units.They are not intended to replace practicalthickness measurements based on commercial portable tools,1These test methods are under the jurisdiction of ASTM Committee D20 onPlastics and are the direct responsibility of Subcommittee D20.10 on MechanicalProperties.Current edition approved Dec.15,2011.Published January 2012.Originallyapproved in 1996.Last previous edition approved in 2006 as D5947 06.DOI:10.1520/D5947-11.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 nor is it implied that thickness measurements made by theprocedures will agree exactly.6.Apparatus6.1 Apparatus AMachinists Micrometer Caliper4withCalibrated Ratchet or Friction Thimble:6.1.1 Apparatus A is a micrometer caliper equipped witheither a calibrated ratchet or a friction thimble.The pressureexerted on the specimen is controllable by the use of a propermanipulative procedure and a calibrated spring(see AnnexA1).6.1.2 Use an instrument constructed with a vernier or digitalreadout capable of measurement to the nearest 2.5 m.6.1.3 Use an instrument with the diameter of the anvil andspindle surfaces(which contact the specimen)of 6.4 6 0.1mm.6.1.4 Use an instrument conforming to the requirements of8.1,8.2,8.5,8.6.1,and 8.6.2.6.1.5 Use the micrometer with the locking device releasedor disengaged,if so equipped.6.1.6 Test the micrometer periodically for conformance tothe requirements of 6.1.4.6.2