1、Designation:D435016(Reapproved 2022)Standard Test Method forCorrosivity Index of Plastics and Fillers1This standard is issued under the fixed designation D4350;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision
2、.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 test method is designed for use in obtaining t
3、hespecific conductance of a water extract of plastics and fillers.The magnitude of this conductance,called the corrosivityindex,is an index of the likelihood that,in a humidatmosphere,metal surfaces in contact with these materials canbe corroded due to galvanic action or direct chemical attack.NOTE1
4、There is no known ISO equivalent to this standard.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 safe
5、ty,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in Section 7.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establish
6、ed 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:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Rel
7、ating to PlasticsD1193 Specification for Reagent WaterE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE145 Specification for Gravity-Convection and Forced-Ventilation OvensE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2251 Specificat
8、ion for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids3.Terminology3.1 Definitions of TermsFor definitions of terms used inthis test method associated with plastics issues refer to theterminology contained in Terminology D883.4.Significance and Use4.1 This test method provides
9、a means for comparing thecorrosive potential of plastics and fillers in humid atmospheres.4.2 This test method is intended for use in research andevaluation.5.Apparatus5.1 Conductance Bridge,Wheatstone type,with a rangefrom 1 to 250 000-measured resistance,a built-inpotentiometer,a 1000 6 50-cycles
10、per second oscillator,and asensitive null point indicator.The bridge shall be capable ofmeasuring resistance with an accuracy of 62%.5.2 Conductivity Cell,dip-type,micro,for solutions ofmedium conductance.The cell needs to have a cell constant ofapproximately 1.0 cm1.The borosilicate glass shall hav
11、e amaximum outside tube diameter of 12.7 mm,overall length of177.8 mm,chamber inside diameter of 9.5 mm,and chamberdepth of 50.8 mm.35.3 Drill,electric,capable of holding a 10.54-mm drill bit,and rotating at 500-r/min maximum speed.5.4 Mill,such as laboratory Wiley cutting mill or equivalent.5.5 Sie
12、ves,standard(alternative)sieve designations 425 m(No.40),and 250 m(No.60)in accordance with Specifica-tion E11.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.16 on Thermosetting Materi-als.Current edition approved Nov
13、.1,2022.Published November 2022.Originallyapproved in 1984.Last previous edition approved in 2016 as D4350-16.DOI:10.1520/D4350-16R22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informat
14、ion,refer to the standards Document Summary page onthe ASTM website.3The sole source of supply of the conductivity cell(Model No.3403)known tothe committee at this time is Yellow Springs Instrument Co.,Inc.,P.O.Box 279,Yellow Springs,OH 45387.If you are aware of alternative suppliers,please providet
15、his information to ASTM International Headquarters.Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou may attend.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,
16、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.15.6 Analytical Balance,capable of determining mass to thenearest 1.0 mg.5.7 Oven,forced-ventilation type,with uniformity of tem-perature wit
