1、Designation: F2331 11 (Reapproved 2016)Standard Test Method forDetermining Chemical Compatibility of Substances inContact with Thermoplastic Pipe and Fittings Materials1This standard is issued under the fixed designation F2331; the number immediately following the designation indicates the year ofor
2、iginal 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 test method is used for determining chemicalcompatibili
3、ty of substances in contact with thermoplastic pipeand fittings materials.1.2 This test method is not intended to evaluate the suitabil-ity of solvent cements or adhesives used to join plastic piping.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parenth
4、eses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 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
5、safety and health practices and to determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of Plastics3. Summary of Test Method3.1 The procedure uses tensile specimen test bars in alongitudinal tensile test
6、geometry in a constant load (creep)method. All procedures are run at an ambient temperature of73F (23C).4. Significance and Use4.1 These procedures can be used to evaluate chemicals ormaterials expected to come in contact with plastic pipingrelative to causing environmental stress-cracking in thermo
7、-plastic materials. This testing results in determining time-to-failure versus engineering stress. This procedure can also beused in stress-rupture regression analysis, where a variety ofstress levels are needed. The methodology can be readilyadapted to conducting immersion tests in liquids or testi
8、ngtemperatures other than 73F (23C).5. Interferences5.1 In these procedures, there may be interference effectsdue to differences in resin or the additives in the thermoplasticmaterials. Until such time as data is available to address this,the user should take this into consideration when applying th
9、istest method.6. Apparatus6.1 Apparatus for constant tensile method.6.1.1 Constant-tensile-load test apparatus which maintainsthe load to within 61 % throughout the test duration.6.1.2 Immersion vessels which can be mounted to thetensile-load apparatus (if applicable).7. Test Specimen7.1 Test bars m
10、ay be either fabricated from compressionmolded plaques, injection molded, or cut from finished prod-uct. Test times and/or stress levels may be reduced byincorporating a knit-line into an injection-molded test bar. If aknit-line is present, the mold should be designed such that theknit-line occurs i
11、n the center of the bar, perpendicular to thelongitudinal axis.7.2 A Type IV specimen as shown in Test Method D638shall be used for referee testing. Other specimen geometries areacceptable if shown to provide equivalent results.8. Calibration and Standardization8.1 All test instrumentation shall be
12、calibrated to standardstraceable to a national standards agency such as the NationalInstitute of Standards and Technology in the United States.9. Conditioning9.1 Condition the specimens and the test chemical ormaterial for 40 h at 73 6 4F (23 6 2C) and 50 % 6 10 % RHprior to applying the test chemic
13、al or material to the specimen.1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Feb. 1, 2016. Published February 2016. Originallyapproved in 2004. Last previous e
14、dition approved in 2011 as F233111. DOI:10.1520/F2331-11R16.2For 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.*
15、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 States110. Procedure10.1 Constant Tensile Method:10.1.1 Attach the grips to the test specimen. The ends of thegrips shall be at l
16、east 0.75 in. (15 mm) from the area where thetest material is being applied. If testing in an immersionapparatus, this requirement does not apply, failures within 0.25in. (6.4 mm) of the grip shall not be considered a valid test.10.1.2 If using a semi-solid paste material, wrap the speci-mens with p
17、lastic wrap or aluminum foil to prevent evapora-tion of liquid components of the paste.10.1.3 If using a liquid, the test specimen must be immersedin the liquid or otherwise exposed in direct contact with theliquid until failure. This exposure should only be used if thechemical agent remains as a li
18、quid for the expected duration ofexposure when installed (for example, antifreeze solutions).10.1.4 For liquid spray-applied products, the product shallbe sprayed or brushed onto the test specimen at a coatingthickness representative of field installation.10.1.5 Test Stress:10.1.5.1 For single-stres
19、s testing, the stress level shall be the1000-h stress from the material stress-rupture curve.10.1.5.2 For multiple-stress testing, at least four stresslevels shall be used with at least one stress at or beyond the2500-h point on the material stress-rupture curve.10.1.6 Apply the load to the specimen
20、 gradually within aperiod of 5 to 10 s without any abrupt or impact-type loadingof the specimen.10.1.7 Record the time-to-failure of each specimen.10.1.8 If the failure occurs at an area away from where thetest material was applied (that is, clean tensile bar region), at atime less than the negative
21、 control, it shall not be considered avalid test for that specimen. If only one of four specimens failsin this manner, it may be discarded and the remaining threereported. If more than one fails in this manner, new specimensshall be tested.11. Calculation or Interpretation of Results11.1 When using
22、this method with a single stress level, theapplied stress or strain should be sufficient to cause failureswith known stress-cracking agents within 100 h. As such, it isgenerally considered acceptable if the chemical or materialunder test does not cause a failure within 1000 h at that samestress leve
23、l.11.2 When using this method with multiple stress levels, thetest specimen fail times must be compared with controlspecimens at each stress level, or a previously establishedregression curve for the thermoplastic material.12. Report12.1 Complete identification of the sealant tested, plasticmaterial
24、 used for the test bars, positive control substance andnegative control substance (if any). This information shallinclude manufacturer, trade designations, principle dimensionsand material identification code or designation.12.2 Method of preparing test specimens.12.3 Environment during conditioning
25、 and testing.12.4 Conditioning procedure (time/temp/RH).12.5 Number of specimens tested.12.6 Cross-sectional dimensions of test specimens.12.7 Stress levels used in testing.12.8 Date of test.12.9 Reference to this Test Method F2331 and the procedureused for interpretation of results.13. Precision an
26、d Bias13.1 This test method specifies a result that is a nonnumeri-cal report of success or failure categorized based on criteriaspecified in the procedure (positive and negative controls). Assuch, no information is presented about either the precision orbias of Test Method F2331 for measuring chemi
27、cal compat-ibility of substances in contact with thermoplastic pipe andfitting materials.14. Keywords14.1 ABS; chemical compatibility; CPVC; fittings; PVC;thread sealantSUMMARY OF CHANGESCommittee F17 has identified the location of selected changes to this standard since the last issue (F2331041)tha
28、t may impact the use of this standard.(1) Revised Title and Scope to include testing any chemicalsubstances rather than just thread sealants.(2) Included reference in Significance and Use to testing withother chemicals and at other temperatures.(3) Deleted the use of positive and negative controls i
29、n thecalibration section and allowed the original material to be thebaseline/control.(4) Expanded the testing procedures to include liquids andspray-applied products.(5) Revised testing to include either single-point (1000-h stresslevel) or multiple points (4 stress levels).(6) Added interpretation
30、of results for multiple stress leveltests.F2331 11 (2016)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such pate
31、nt rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited eith
32、er for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair h
33、earing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standa
34、rd may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 11 (2016)3
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