ASTM_D_4968_-_19a.pdf

Designation:D496819aStandard Practice forAnnual Review of Test Methods and Specifications forPlastics1This standard is issued under the fixed designation D4968;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 This practice is intended to assist the subcommittees andsections of Committee D20 on Plastics with the process ofstandards evaluation during the five-year review mandated byASTM or when changes to test methods and specifications arerequired.It is intended to complement the Form and Style forASTM Standards(“Blue Book”)not replace it.NOTE1There is no known ISO equivalent to this standard.1.2 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:2D883 Terminology Relating to PlasticsD5740 Guide for Writing Material Standards in the Classi-fication FormatE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2653 Practice for Conducting an Interlaboratory Study toDetermine Precision Estimates for a Fire Test Methodwith Fewer Than Six Participating LaboratoriesE2935 Practice for Conducting Equivalence Testing inLaboratory ApplicationsForm and Style for ASTM Standards(Blue Book)3.Terminology3.1 DefinitionsFor definitions of terms that appear in thispractice relating to plastics,refer to Terminology D883.3.2 For definitions of terms that appear in this practicerelating to quality and statistics,refer to Terminology E456.3.2.1 Repeatabilityprecision under repeatability condi-tions.(E456)3.2.2 repeatability conditions,nconditions where inde-pendent test results are obtained with the same method onidentical test items in the same laboratory by the same operatorusing the same equipment within short intervals of time.(E456)3.2.3 Reproducibilityprecision under reproducibility con-ditions.(E456)3.2.4 reproducibility conditions,nconditions where testresults are obtained with the same method on identical testitems in different laboratories with different operators usingdifferent equipment.(E456)3.3 The International Code Council(ICC)has issued guide-lines for standards that are appropriate for reference in ICCcodes,which include the requirement that they shall be writtenin mandatory language.3.3.1 In practice,the key issue is to avoid using the terms“may”and“should,”except within definitions,appendixes andnon-mandatory notes.4.Significance and Use4.1 It is the intention of this practice,in addition to the Formand Style for ASTM Standards,to assist persons revising testmethods and specifications in Committee D20 to ensure that allrequired elements are included and that the revised documentis presented in the most user-friendly manner possible.4.2 This practice is intended for use by Committee D20when test methods and specifications under its jurisdiction arerevised because of technical changes or upon five-year review.4.3 The figures in Annex A1 contain three flowcharts.Fig.A1.1 is a flowchart that shows the review process for standardsthat have been revised or reapproved recently.Fig.A1.2 is aflowchart for standards that have neither been revised norreapproved within five years of a new review.Fig.A1.3 is aflowchart for the precision and bias process in outline form.1This guide is under the jurisdiction of ASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.90 on Executive.Current edition approved Aug.1,2019.Published August 2019.Originallyapproved in 1989.Last previous edition approved in 2019 as D4968-19.DOI:10.1520/D4968-19A.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.*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 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 4.4 Specific instructions to be followed when revisingCommittee D20 documents are given in this practice.4.5 The model precision and bias(P a