ASTM D618-21 outlines several procedures to handle different types of plastics and testing requirements. The standard generally focuses on conditioning, which does not always require reaching total equilibrium, but ensures a standardized state.
Outlines how to handle samples prior to the conditioning phase.
(Flexural Properties of Unreinforced/Reinforced Plastics) ASTM D256 (Izod Impact Resistance) ASTM D149 (Dielectric Breakdown Voltage) How to Get the ASTM D618-21 PDF astm d618-21 pdf
What or resin grade are you preparing to test?
Specimens are conditioned at 50 ± 3 °C for 24 hours, followed by cooling in a desiccator. This drives off moisture to test the material in its dry state. ASTM D618-21 outlines several procedures to handle different
The standard establishes the procedures for bringing test specimens to equilibrium with specific atmospheric conditions (temperature and humidity) before mechanical, electrical, or physical testing is performed.
40 hours at 23°C and 50% humidity. This is the "default" for most molded plastics under 7mm thick. The standard establishes the procedures for bringing test
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ASTM D618-21 defines several specific procedures (Procedures A through E) to simulate various service environments: Condition at Relative Humidity. Duration: 40 hours for thickness ≤is less than or equal to 7 mm, 88 hours for > 7 mm. Procedure B (Oven Conditioning): Conditioning in an oven at for 48 hours, followed by cooling in a desiccator.
While the core principles of conditioning remain similar, the -21 version may contain updated: