ASTM_D_543_-_21.pdf

Designation:D54321Standard Practices forEvaluating the Resistance of Plastics to ChemicalReagents1This standard is issued under the fixed designation D543;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.Scope*1.1 These practices cover the evaluation of all plasticmaterials including cast,hot-molded,cold-molded,laminatedresinous products,and sheet materials for resistance to chemi-cal reagents.1.2 Three procedures are presented,two under practice A(Immersion Test),and one under practice B(Mechanical Stressand Reagent Exposure under Standardized Conditions ofApplied Strain).These practices include provisions for report-ing changes in weight,dimensions,appearance,color,strength,and other mechanical properties.Standard reagents are speci-fied to establish results on a comparable basis without preclud-ing the use of other chemical reagents pertinent to specificchemical resistance requirements.Provisions are made forvarious exposure times,stress conditions,and exposure toreagents at elevated temperatures.The type of conditioning(immersion or wet patch/wipe method)depends upon theend-use of the material.If the material is used as a container ortransfer line,immersion of the specimens is used.If thematerial will only see short exposures or will be used inproximity and reagent will splash or spill on the material,thewet patch or wipe method of applying reagent to the materialis used.NOTE1Practice B for evaluating environmental stress crackingresistance differs from Practice D7474,which seeks to measure residualstresses in molded sulfone plastic parts with the use of calibrated chemicalreagents.Practice B differs from Test Method D1693,which seeks toquantify the susceptibility of ethylene plastics to environmental stress-cracking subjected to specific conditions,by measuring the proportion ofspecimens that crack in a given time.1.3 The effect of chemical reagents on properties shall bedetermined by making measurements on standard specimensfor such tests before and after immersion or stress,or both,ifso tested.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.5 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.Specific hazards statements are given in Section 7.NOTE2ISO 175 and ISO 22088 Part 3 address the same subjectmatter as PracticesAand B of this standard,but differ in technical contentand the results cannot be directly compared.1.6 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:2D13 Specification for Spirits of TurpentineD396 Specification for Fuel OilsD618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1040 Specification for Uninhibited Mineral Insulating Oilfor Use in Transformers and in Oil Circuit Breakers(Withdrawn 1980)3D1693 Test Method for Environmental Stress-Cracking ofEthylene PlasticsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD5947 Test Methods for Physical Dimensions of SolidPlastics Specimens1These practices are under the jurisdiction ofASTM Committee D20 on Plasticsand are the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved Dec.1,2021.Published December 2021.Originallyapproved in 1939.Last previous edition approved in 2020 as D543-20.DOI:10.1520/D0543-21.2For 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.3The last approved version of this historical standard is referenced onwww.astm.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 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 Te