1、Designation:D522721Standard Test Method forMeasurement of Hexane Extractable Content of Polyolefins1This standard is issued under the fixed designation D5227;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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 test method describes an extraction/gravimetricprocedure for determination of the amount of hexane solublelow molecular weight mater
3、ial present in polyethylene,polypropylene,ethylene-propylene copolymers,and ethylene-vinyl acetate copolymers.This test method is a modification ofthe Food and Drug Administration(FDA)procedure fordetermining hexane extractables of polyolefins.This testmethod is based upon the presumption that the w
4、eight of theresidue extract present in the solvent is equal to the amountextracted from the film sample and could therefore be quanti-fied by measuring the weight loss of the extracted film,eliminating the complex and time-consuming evaporationprocess described in 21 CFR 177.1520.1.2 This standard d
5、oes 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.1.3 The values stated i
6、n SI units are to be regarded as thestandard.Units used in 21 CFR 177.1520 are also used in thistest method.Units are in conformance with Federal Code 21CFR 177.1520,from which this test method is derived.NOTE1There is no known ISO equivalent to this standard.1.4 This international standard was deve
7、loped 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 Documen
8、ts2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1239 Test Method for Resistance of Plastic Films toExtraction by ChemicalsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsE131 Terminology Relating to Molecular SpectroscopyE456 Terminology Relating to Quality and StatisticsE691
9、 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2935 Practice for Evaluating Equivalence of Two TestingProcesses2.2 Federal Document:321 CFR 177.1520 Olefin Polymers3.Terminology3.1 The definitions given in Terminology D883,D1600,E131,and E456 are applica
10、ble to this test method.3.2 Abbreviations:3.2.1 EVAethylene-vinyl acetate copolymer.3.2.2 LDPElow-density polyethylene.3.2.3 HDPEhigh-density polyethylene.3.2.4 LLDPElinear low-density polyethylene.3.2.5 FDAFood and Drug Administration.3.2.6 PPpolypropylene.4.Summary of Test Method4.1 Film samples a
11、re extracted with hexane for 2 h at 49.56 0.5C,dried,and weighed.4.2 The loss in weight of the film is presumed to be equal tothe extractable content determined by solvent evaporation inthe FDA protocol.5.Significance and Use5.1 FDA requirements for maximum extractables are speci-fied for resin and
12、uses.This test method provides a means todetermine the amount of hexane-soluble low molecular weightmaterial present in polyolefins.It is applicable to resinscontaining greater than 0.20%extractables.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct respo
13、nsibility of Subcommittee D20.70 on Analytical Methods.Current edition approved July 1,2021.Published July 2021.Originally approvedin 1992.Last previous edition approved in 2013 as D5227-13.DOI:10.1520/D5227-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Custome
14、r Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.*A Summary o
15、f 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 De
16、cision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.16.Apparatus6.1 Water Bath,maintained at 49.5 6 0.5C.6.2 Resin Kettle,1500-mL.6.3 Kettle Head,3-neck,with one 45/50 and two 24/40female joints,and appropriate stoppers.6.4 Clamp.6.5 Allihn Condenser,Size C,with 45/50 male joint.6.6 Plastic Sleeves,tetrafluoroethylene(TFE),to fit Allihncondenser 45/50 male joint.6.7 Vacuum O
