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: This is the most common method. It uses an environmental chamber set to 23°C and 50% relative humidity. The conditioning time depends on thickness: 40 hours for specimens ≤7 mm and 88 hours for those >7 mm. This method is best for general testing and routine quality control.

is the current standard practice for conditioning plastics for testing . It establishes uniform procedures to ensure that the physical and electrical properties of plastic materials—which are highly sensitive to temperature and humidity—are standardized before and during evaluation. Purpose and Significance astm d618-21 pdf

40 hours at 23°C and 50% humidity. This is the "default" for most molded plastics under 7mm thick. : This is the most common method