ASTM F2331-11(R2021) pdf free download

ASTM F2331-11(R2021) pdf free download.Standard Test Method for Determining Chemical Compatibility of Substances in Contact with Thermoplastic Pipe and Fittings Materials
1. Scope
1.1 This test method is used for determining chemical compatibility of substances in contact with thermoplastic pipe and 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 regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Significance and Use
4.1 These procedures can be used to evaluate chemicals or materials expected to come in contact with plastic piping relative to causing environmental stress-cracking in thermo- plastic materials. This testing results in determining time-to- failure versus engineering stress. This procedure can also be used in stress-rupture regression analysis, where a variety of stress levels are needed. The methodology can be readily adapted to conducting immersion tests in liquids or testing temperatures other than 73 °F (23 °C).
5. Interferences
5.1 In these procedures, there may be interference effects due to differences in resin or the additives in the thermoplastic materials. Until such time as data is available to address this, the user should take this into consideration when applying this test method.
6. Apparatus
6.1 Apparatus for constant tensile method. 6.1.1 Constant-tensile-load test apparatus which maintains the load to within 61 % throughout the test duration. 6.1.2 Immersion vessels which can be mounted to the tensile-load apparatus (if applicable).
7. Test Specimen
7.1 Test bars may be either fabricated from compression molded plaques, injection molded, or cut from finished prod- uct. Test times and/or stress levels may be reduced by incorporating a knit-line into an injection-molded test bar. If a knit-line is present, the mold should be designed such that the knit-line occurs in the center of the bar, perpendicular to the longitudinal axis. 7.2 A Type IV specimen as shown in Test Method D638 shall be used for referee testing. Other specimen geometries are acceptable if shown to provide equivalent results.
10. Procedure
10.1 Constant Tensile Method: 10.1.1 Attach the grips to the test specimen. The ends of the grips shall be at least 0.75 in. (15 mm) from the area where the test material is being applied. If testing in an immersion apparatus, this requirement does not apply, failures within 0.25 in. (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 wrap or aluminum foil to prevent evapora- tion of liquid components of the paste. 10.1.3 Ifusing a liquid, the test specimen must be immersed in the liquid or otherwise exposed in direct contact with the liquid until failure. This exposure should only be used if the chemical agent remains as a liquid for the expected duration of exposure when installed (for example, antifreeze solutions). 10.1.4 For liquid spray-applied products, the product shall be sprayed or brushed onto the test specimen at a coating thickness representative of field installation. 10.1.5 Test Stress: 10.1.5.1 For single-stress testing, the stress level shall be the 1000-h stress from the material stress-rupture curve. 10.1.5.2 For multiple-stress testing, at least four stress levels shall be used with at least one stress at or beyond the 2500-h point on the material stress-rupture curve. 10.1.6 Apply the load to the specimen gradually within a period of 5 s to 10 s without any abrupt or impact-type loading 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 the test material was applied (that is, clean tensile bar region), at a time less than the negative control, it shall not be considered a valid test for that specimen. If only one of four specimens fails in this manner, it may be discarded and the remaining three reported. If more than one fails in this manner, new specimens shall be tested.