1、Designation: F2331 11An American National StandardStandard 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 th
2、e 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.1. Scope*1.1 This test method is used for determining chemical
3、compatibility 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
4、 in parentheses 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 ap
5、pro-priate 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 te
6、nsile test 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-crackin
7、g in thermo-plastic materials. This testing results in determining time-to-failure vs. engineering stress. This procedure can also be usedin stress-rupture regression analysis, where a variety of stresslevels are needed. The methodology can be readily adapted toconducting immersion tests in liquids
8、or testing temperaturesother 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 app
9、lying thistest 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 Tes
10、t bars may 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
11、occurs in 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 s
12、hall be 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 hours at 73F 6 4 (23 6 2C) and 50 % 610 % RH prior to applying the
13、 test chemical or material to thespecimen.1This test method is under the jurisdiction of ASTM Committee F17 and is thedirect responsibility of Subcommittee F17.20 on Joining.Current edition approved Dec. 1, 2011. Published January 2012. Originallyapproved in 2004 as D233104. Last previous edition ap
14、proved in 2004 asD2331041. DOI: 10.1520/F2331-04E01.2For 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.1*A Summa
15、ry of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.10. Procedure10.1 Constant tensile method10.1.1 Attach the grips to the test specimen. The ends of thegrips shall be at least 0.
16、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 plastic
17、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 liquid fo
18、r 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-stress testi
19、ng, the stress level shall be the1000-hour 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-hour point on the material stress-rupture curve.10.1.6 Apply the load to the specimen
20、gradually within aperiod of 5 to 10 seconds without any abrupt or impact-typeloading of 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 neg
21、ative control, it shall not be considered avalid test for that specimen. If only one of 4 specimens fails inthis 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 usin
22、g this method with a single stress level, theapplied stress or strain should be sufficient to cause failureswith known stress-cracking agents within 100 hours. As such,it is generally considered acceptable if the chemical or materialunder test does not cause a failure within 1 000 hours at thatsame
23、stress level.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, plas
24、ticmaterial 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 c
25、onditioning and testing.12.4 Conditioning procedure (time/temp/RH)12.5 Number of specimens tested12.6 Cross-sectional dimensions of test specimens12.7 Stress levels used in testing.12.8 Date of test12.9 Reference to this test method F2331 and the procedureused for interpretation of results.13. Preci
26、sion and 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 measurin
27、g chemical compat-ibility of substances in contact with thermoplastic pipe andfitting materials.14. Keywords14.1 Thread sealant; chemical compatibility; ABS; PVC;CPVC; fittingsSUMMARY OF CHANGESCommittee F17 has identified the location of selected changes to this standard since the last issue(F23310
28、41) that 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 con
29、trols in 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-hrstress level) or multiple points (4 stress levels).(6) Added interpr
30、etation of results for multiple stress leveltests.F2331 112ASTM 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 pat
31、ent 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 eit
32、her 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
33、hearing 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 stand
34、ard 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 ASTM website (www.astm.org/COPYRIGHT/).F2331 113
