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. This aging procedure can be helpful in predicting how materials will age with time. Exposure to higher temperatures than the intended use temperature for extended periods of time causes polymers to age prematurely. 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. ASTM D3045 is a standard practice for heat aging of plastics without load.
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