1、Designation:D435016Standard 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.A number in pare
2、ntheses 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 This test method is designed for use in obtaining thespecific condu
3、ctance 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.NOTE1There is no know
4、n 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 safety and health pr
5、actices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1193 Specification for Reagent
6、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 Specification for Liquid-in-Glass ASTM Thermom-eters with L
7、ow-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 a means for comparing thecorrosive potential of p
8、lastics 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 per second oscillator,and asensitive null point i
9、ndicator.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 have amaximum outside tube diameter of 12.7 mm,overa
10、ll 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 Sieves,standard(alternative)sieve designations 425 m
11、(No.40),and 250 m(No.60)in accordance with Specifica-tion E11.5.6 Analytical Balance,capable of determining mass to thenearest 1.0 mg.5.7 Oven,forced-ventilation type,with uniformity of tem-perature within 61%of the differential between oven and1This test method is under the jurisdiction of ASTM Com
12、mittee D20 on Plasticsand is the direct responsibility of Subcommittee D20.16 on Thermosetting Materi-als.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1984.Last previous edition approved in 2015 as D4350-15.DOI:10.1520/D4350-16.2For referenced ASTM standards,visi
13、t 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 sole source of supply of the conductivity cell(Model No.3403)known tothe committee at this time
14、is Yellow Springs Instrument Co.,Inc.,P.O.Box 279,Yellow Springs,OH 45387.If you are aware of alternative suppliers,please providethis information to ASTM International Headquarters.Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou may atte
15、nd.*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 ambient temperature,with a rate of ventilation of 100 to 200 airchanges per hour,in accordance with Specification E145,Typ
16、eIIA.5.8 Thermometer,solid-stem,precision,ASTM No.S63C,in accordance with Specification E2251.Temperature measur-ing devices with equivalent accuracy and characteristics,suchas RTDs and thermistors,are permitted.Additionally,use ofASTM No.S63C in accordance with Specification E2251 isacceptable.5.9 Chemical Glassware:5.9.1 Borosilicate Glass Flask,nominally 1000-mL size,with ground glass stopper.5.9.2 Borosilicate Glass Erlenmeyer Flask,65-mL actualcapacity to bottom of stopper(nominally 50-mL s
