ASTM D573-04(R2019) pdf free download

ASTM D573-04(R2019) pdf free download.Standard Test Method for Rubber—Deterioration in an Air Oven
1. Scope
1.1 This test method covers a procedure to determine the influence of elevated temperature on the physical properties of vulcanized rubber. The results of this test method may not give an exact correlation with service performance since perfor- mance conditions vary widely. This test method may, however, be used to evaluate rubber compounds on a laboratory com- parison basis. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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 of regulatory limitations prior to use. (For specific precautionary statement, see Note 1.) 1.4 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.
3. Summary of Test Method
3.1 Specimens of vulcanized rubber are exposed to the deteriorating influence of air at specified elevated temperatures for known periods oftime, after which their physical properties are determined. These are compared with the properties deter- mined on the original specimens and the changes noted. 3.2 Unless otherwise specified, the determination of the physical properties shall be carried out in accordance with Test Methods D412. 3.3 Except as may be otherwise specified in this test method, the requirements of Practices D3182 and D3183 shall be complied with and are made part of this test method. 3.4 In case of conflict between the provisions of this test method and those of detailed specifications or test methods for a particular material, the latter shall take precedence.
4. Significance and Use
4.1 Rubber and rubber products must resist the deterioration of physical properties with time caused by oxidative and thermal aging. This test method provides a way to assess these performance characteristics of rubber, under certain acceler- ated conditions as specified. 4.2 Please refer to Annex A1 for important information on standard compounds used for precision testing for accelerated test aging evaluation.
7. Test Specimens
7.1 Dumbbell-shaped specimens prepared as described in Test Methods D412 shall be considered standard. Their form shall be such that no mechanical, chemical, or heat treatment will be required after exposure. If any adjustments (for example, to thickness) are necessary, they should be performed prior to exposure. 7.2 The cross-sectional dimensions of test specimens for calculating the physical properties shall be measured prior to exposure in the aging chamber. Gage lines used for measuring elongation shall be applied after the specimens have been aged. Only specimens of similar dimensions having approximately the same exposed areas may be compared with each other.
8. Number of Test Specimens
8.1 At least three test specimens shall be used to determine the original physical properties of each sample and also three or more specimens of the same material for each exposure period of the test. 8.2 When minimum requirements are specified, one test shall be made for tensile strength and elongation. If the results are below the specified requirements, two additional specimens shall be prepared from the original sample and tested. Should the results of either of these tests be below the specified requirements, the samples shall be considered to have failed to meet the specifications.