Heat Aging Without Load ASTM D3045

Heat Aging Without Load ASTM D3045

ASTM D3045 determines the Heat Aging of Plastics Without Load and can predict how materials will degrade or oxidize over time. Samples are placed in hot air for an extended period of time during this test.

    Scope:

    ASTM D3045 test is standard practice to define the exposure parameters for determining the resistance of plastics to oxidize or degrade when placed in hot air for an extended period of time. Polymers or plastic materials exposed to elevated temperatures than the normal temperature for a longer period of time will cause some degradation resulting in changes in physical properties. This test practice can be helpful in predicting how materials will degrade or oxidize over time. This practice plays a leading role in comparison of the thermal weathering properties of substances at a single temperature. 

    Test Procedure:

    For ASTM D3045 practice, all materials must be placed at the same time in the same equipment if tests are carried out at a single temperature. A minimum of four exposure temperatures is used to determine the relationship between temperature and a specified property change. The time period to produce the desired level of the property is about 9-12 months using the lowest temperature and about six months for the next higher temperature for the same level of the property. Similarly, third and fourth temperatures should generate a similar property change in three months and one month, respectively. The exposure temperature is selected as specified ASTM D618. Generally, it is difficult to determine the effect of heat aging without test data, so it is required to begin only with short-term aging at one or two temperatures unless some data are obtained for conducting the test. One set of samples are tested for the selected property as stated by ASTM D3045. The remaining set of samples are exposed for the selected time intervals at the specified temperature. These samples are subjected to stated exposure conditions and then are tested. In case if the effect of aging is expected without heat then a parallel set or unexposed samples are tested. Also, a method is established if required for cooling after oven exposure. 

    Sample size:

    The total number and kind of test samples necessary should be as stated by ASTM D3045 to determine the specific property. A minimum of three replicates of each material should be used until there is no specification or agreement by all interested parties. 

    Data:

    95 % confidence interval

    Analysis of variance

    Regression

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