Standard Test Method for Determining Temperature of Deflection of Plastics and Ebonite under Load
|Publication Date:||10 June 1996|
|ICS Code (Plastics in general):||83.080.01|
1.1 This test method covers three procedures for determination of the temperature of deflection under load (bending stress) of plastics and ebonite:
1.1.1 Test Method A, using a nominal surface stress of 1.80 MPa;
1.1.2 Test Method B, using a nominal surface stress of 0.45 MPa; and
1.1.3 Test Method C, using a nominal surface stress of 8.00 MPa.
1.2 The test specimens are tested in one of two positions, flatwise or edgewise, with the requirements on test specimen dimensions being different in each case (see Guide D 5944, Section 6).
1.3 See Guide D 5944, 1.3.
NOTE 1--The test methods give better reproducibility with amorphous plastics than with semi-crystalline ones. With some materials, it may be necessary to anneal the test specimens to obtain reliable results. If applied, annealing procedures generally result in an increase in the temperature of deflection under load (see 6.2 and 6.3).
1.4 This test method is identical to ISO 75-2. This test method is comparable to Test Method D 648, but neither test method should be substituted for the other. The two test methods may differ with respect to test specimen dimensions, test specimen conditioning, test equipment, testing conditions, etc. The two test methods may not give the same results.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.