Historical Version s - view previous versions of standard. More D The severity of the exposures in both time and temperature determines the extent and type of change that takes place. A plastic material is not necessarily degraded by exposure to elevated temperatures. However, extended periods of exposure of plastics to elevated temperatures will generally cause some degradation, with progressive changes in physical properties. Specific properties and failure or lifetime criteria for these properties are typically chosen for the evaluation of thermal endurance.
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ASTM D is a standard practice for heat aging of plastics without load. It tests the exposure conditions to which plastics should be exposed to test their resistance to oxidation or other types of degradation occurring over time. Exposure to higher temperatures than the intended use temperature for extended periods of time causes polymers to age prematurely. This aging procedure can be helpful in predicting how materials will age with time.
This practice plays a guiding role in comparing thermal weathering characteristics of materials as measured by the fluctuation in specific properties of interest at a single temperature. Procedures for comparing thermal aging characteristics of materials at a series of temperature for the purpose of estimating the time needed for a defined property to change are also described in this practice. Exposure to heat can cause many types of physical and chemical changes in plastics.
The level of exposure in both temperature and time will affect the extent as well as the type of property changes that will occur. While polymers are not certainly degraded by short exposures to high temperature, extended periods of exposure of plastics to high temperature will generally cause some deterioration as well as a gradual change in physical properties as different properties may not all change at the same rate.
ASTM D simulates hot conditions in which the materials are intended to be used to understand their durability and expected lifespan to avoid property losses.
It is crucial to understand that different factors synergistically combine to magnify the aging process while many standards only test one of these factors. It will be our pleasure to answer you questions based on your unique material testing requirements. All Rights Reserved.
Standard Practice for Heat Aging of Plastics Without Load
Active view current version of standard. Other Historical Standards. More D Only the procedure for heat exposure is specified, not the test method or specimen. The effect of heat on any particular property may be determined by selection of the appropriate test method and specimen.
ASTM D3045 - 18
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