ASTM D618-13
ASTM D618-13 establishes procedures for conditioning plastic test specimens so temperature and humidity do not introduce unnecessary variation into laboratory results. It is a conditioning practice rather than a test method for a specific machine. Common equipment includes environmental conditioning chambers, temperature-controlled rooms, calibrated thermometers, hygrometers, and suitable specimen racks. These instruments help laboratories maintain and verify the atmosphere surrounding samples before testing. Because moisture and temperature can influence the mechanical and electrical properties of plastics, consistent conditioning supports more meaningful comparisons between materials and laboratories. Proper equipment selection, routine calibration, and careful sample placement are important for obtaining dependable data during material evaluation and quality control.
To apply ASTM D618-13, technicians identify the conditioning requirements in the relevant material specification and choose the appropriate atmosphere and exposure period. Samples are prepared, positioned to allow adequate air circulation, and kept under controlled conditions for the required duration. Temperature, relative humidity, conditioning time, and any deviations should be documented before the specimens undergo their designated tests. Where specified, the testing environment must also be controlled to avoid changes in specimen condition during measurement. This process improves reproducibility in tensile, flexural, impact, and electrical testing, while helping manufacturers investigate inconsistent results. Laboratories should follow the applicable material specification whenever its requirements modify the general conditioning practice.
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