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ASTM D2115-22

Current Revision

Standard Practice for Oven Heat Stability of Poly(Vinyl Chloride) Compositions

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1.1 This practice lists procedures for determining the relative thermal stability of sheet or molded poly(vinyl chloride) compounds as indicated by discoloration due to exposure to an elevated temperature at controlled oven conditions.

1.2 A specimen preparation technique using a two-roll mill is provided for compositions that are not in molded or sheeted form.

1.3 This practice is not intended for use in purchasing specifications because the conditions of processing plastic compounds vary widely, and the degree of correlation of data obtained by this practice to process exposure has not been determined. However, despite this limitation, this practice does yield data of value in judging the comparative service quality of poly(vinyl chloride) compositions.

1.4 The values stated in SI units are to be regarded as the standard. The values in parentheses are given for information only.

1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Note 1: This standard is similar in content, but not technically equivalent to ISO 305–1990.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


4.1 Poly(vinyl chloride) compositions degrade by discoloration on prolonged exposure to heat. The degree of discoloration is related to the condition of exposure, such as length of period and temperature. When the conditions of exposure are fixed and controlled, then the relative resistance to discoloration due to heat of two or more compositions is able to be determined. The precision of heat stability testing is also dependent on the thickness of the specimens and the history of heat exposure prior to testing. This practice allows for control or the reporting of these variables.

4.2 This practice is particularly applicable for determining gross differences in the heat stabilities of poly(vinyl chloride) compositions that are detectable as a color change. It is not intended to measure absolute thermal stability. This test method applies when observed changes are evidence of degradation, molecular degradation phenomena such as chain-scission or cross-linking are not identifiable.

4.3 While discoloration caused by exposure to elevated temperature is commonly regarded as evidence of degradation in poly (vinyl chloride) compositions, some vinyl compositions undergo substantial change in color without appreciable loss of mechanical strength, chemical resistance, etc., whereas others resist change in color yet undergo substantial change in other properties. Do not take resistance to discoloration as sole evidence of thermal stability. It is recommended that this test be supplemented by others such as tensile strength and elongation, impact strength, and deflection temperature under load (for rigid compositions), durometer hardness (for nonrigid compositions), and dilute solution viscosity. The test results before and after oven exposure are compared to determine the degree of degradation that has been produced in each of the properties measured.

4.4 This practice is able to predict the relative discoloration in processing, provided that the compositions in question are tested at the relative maximum temperatures developed in processing.

4.5 This practice is not applicable to materials that will cross-contaminate during oven exposure.

SDO ASTM: ASTM International
Document Number D2115
Publication Date July 15, 2022
Language en - English
Page Count 3
Revision Level 22
Supercedes
Committee D20.15
Publish Date Document Id Type View
July 15, 2022 D2115-22 Revision
Sept. 1, 2017 D2115-17 Revision
Aug. 1, 2010 D2115-10 Revision
March 1, 2004 D2115-04 Revision
July 10, 2003 D2115-92R03 Reaffirmation
Nov. 10, 1997 D2115-92R97 Reaffirmation