ASTM D618-21 establishes standard practices for conditioning plastic specimens to ensure reproducible physical and electrical testing by controlling temperature and humidity. The standard, which often employs a baseline 23°C/50% RH conditioning (Procedure A), ensures material stabilization to prevent environmental exposure from skewing results. Access the standard on the ASTM website ASTM International
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Without proper conditioning, test results can be misleading. For instance, a moisture-sensitive plastic like Nylon (PA) will test differently at 20% relative humidity (RH) compared to 65% RH. eliminates this variable. astm d618-21 pdf
Because plastic properties are "influence[d] by temperature and relative humidity," this standard is critical for making reliable comparisons between different materials, batches, or laboratories. Key Objectives of Conditioning
When sourcing the official , laboratories must ensure compliance with international copyright regulations: eliminates this variable
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Once you have your , follow this 5-step implementation checklist: Once you have your
The standard classifies environmental preparation into several highly structured procedures. Laboratories must maintain tight tolerances for temperature and moisture control. Conditioning Environment Primary Use Case
Ensure the chamber remains sealed. Fluctuations outside the permitted tolerances will reset the testing clock.
ASTM standards are living documents, revised periodically to reflect new technology or improved practices. Users looking specifically for the should be aware that this version supersedes previous versions (such as D618-13).
: Subjecting the plastic to specific abnormal environments to anticipate how it will behave during actual field service. The 5 Standard Conditioning Procedures