ASTM D2126 Response of Rigid Cellular Plastics to Thermal and Humid aging

ASTM D2126 contains techniques for exposing stiff cellular polymers to heat and humidity. This test method is intended to recommend a variety of conditions from which one or more of the desired exposure conditions can be selected. The values expressed in SI units should be considered as standard.

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    ASTM D2126 test method is used to determine the response of rigid cellular plastic to thermal and humid aging. It is designed to recommend several different conditions from which you can choose one or more desired conditions of exposure. Artificial exposure to predict the effective behavior of rigid cellular plastics must be based mainly on the intended application due to the enormous diversity of potential uses. 


    In ASTM D2126, the dimensions of three principal axes to the nearest 60.1 percent are determined. Secondly, the test specimens are conditioned in a circulating air oven, humidity oven, or cold box at one of the temperatures and relative humidity combinations. Then, the models are allowed to come to room temperature for two hours after exposure before measuring and testing. At each stage of the testing method, any changes in the general appearance are noted.

    Specimen size:

    A test specimen used in ASTM D2126 weighs less than 100 grams. An oven that can hold a humidity level of 63 percent with circulating air capable of maintaining the required exposure temperature of 62°C (4°F) is used.


    Change, % = [(mf – mo)/mo] ×100 

    where: mf is the final measurement, and mo is the actual measurement.

    At each exposure period in the ASTM D2126 test, the mean percentage changes in length, breadth, thickness, and mass to the nearest 0.1 percent, as well as the respective standard deviation is reported.


    ASTM D2126 test method is used to determine the response of rigid cellular plastic to thermal and humid aging.


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