Conditioning is rarely about reaching "perfect" equilibrium, as some plastics might require 20 to 100 days to fully stabilize. Instead, ASTM D618-21 provides a practical framework to:
Assessing the impact of water immersion and moisture absorption. As specified by the material standard astm d61821 pdf
Standard Practice for Conditioning Plastics for Testing - ASTM astm d61821 pdf
To maintain the integrity of these procedures, ASTM D618-21 mandates strict control over the laboratory environment: : Defined as relative humidity. astm d61821 pdf
While is the technically equivalent international standard, there are notable differences:
: Variations are strictly limited. For example, if a temperature tolerance of is required, the humidity tolerance must be within
The standard, officially titled the " Standard Practice for Conditioning Plastics for Testing ," is a foundational document used in materials science to ensure that plastic specimens are prepared under uniform environmental conditions. Because the physical and electrical properties of plastics are highly sensitive to temperature and humidity, standardizing these variables is critical for obtaining accurate, repeatable, and comparable test results across different laboratories.