ASTM D618-21 is the gold standard for conditioning plastics before testing. Because plastic properties change with temperature and humidity, this practice ensures every lab gets consistent results. What is ASTM D618-21?
Roughly every 5–8 years. The previous revisions were 2008, 2013, and 2021. Check ASTM.org for future updates.
ASTM D618-21 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
Procedure A: 40 hours at 23°C and 50% humidity. This is the "default" for most molded plastics under 7mm thick.
The document outlines several "Procedures" labeled A through F. Here are the most frequent: ASTM D618-21 is the gold standard for conditioning
Crucial Tip: Always verify the revision letter/date before downloading. A PDF labeled "D618-21" is current; "D618-13" is archived.
Q6: Can I use a dehumidifier instead of a chamber? A: No. D618-21 requires closed, controlled chambers with active humidity control. How often is D618 revised
Procedure B: 48 hours at 50°C. Used to drive out moisture or simulate moderate heat exposure.
