Also, I can provide the pdf of this standard if you need it.
Conditioning plastics prior to testing is crucial because their physical and mechanical properties can be significantly affected by temperature, humidity, and time. Plastics can absorb moisture, relax stresses, or undergo physical changes when exposed to different environmental conditions. If plastics are not properly conditioned, these changes can impact test results, leading to variability, inaccuracies, or even incorrect conclusions. astm d618-21 pdf
Best regards A.