ASTM F2331-11 (R2021) pdf free download.Standard Test Method for Determining Chemical Compatibility of Substances in Contact with Thermoplastic Pipe and Fittings Materials.
1.1 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 suitability of solvent cements or adhesives used to join plastic piping.
1.3 The values stated in inch-pound units are to he 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.
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 thermoplastic materials. This testing results in determining time-to- failure versus engineering stress. This procedure can also he used in stress-rupture regression analysis. where a variety of stress levels are needed. The methodology can he 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 ± 1 % throughout the test duration.
6.1.2 Immersion vessels which can he 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 product. 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 he 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 he used for referee testing. Other specimen geometries are acceptable if shown to provide equivalent results.
8. Calibration and Standardization
8.1 All test instrumentation shall be calibrated to standards traceable to a national standards agency such as the National Institute of Standards and Technology in the United States.ASTM F2331 pdf download.