is the current standard practice for conditioning plastics for testing . Published in July 2021, it establishes standardized temperature and humidity conditions to ensure reproducible results across different laboratories and materials. Core Conditioning Procedures
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Procedure D) within the ASTM D618-21 standard for a project?
Condition [Hours] / [Temperature] / [Humidity]Condition [Hours] / [Temperature] / [Humidity] astm d618-21 pdf
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A: The 2021 revision tightens humidity tolerances, clarifies test time limits, and updates referenced standards.
The 2021 update (ASTM D618-21) keeps the fundamental principles of previous versions (such as D618-13 or D618-08) while ensuring the document remains up-to-date with current industry needs.
For most materials, 40 hours at standard conditions is sufficient. For thick specimens (e.g., >7mm), extend to 88 hours or use weight verification. is the current standard practice for conditioning plastics
Standard Practice for Conditioning Plastics for Testing - ASTM
: When testing occurs at a completely different temperature, a capital letter " T " is added [1.10]. For instance, Condition 24/180 : T—180 indicates 24 hours of conditioning at 180∘C180 raised to the composed with power C and testing executed at 180∘C180 raised to the composed with power C Critical Factors for Lab Implementations Material Thickness & Equilibrium Limits
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Engineers dealing with international trade frequently compare ASTM D618 to its European/International equivalent, ("Plastics — Standard atmospheres for conditioning and testing"). While they share the same objective, minor operational differences exist: ASTM D618-21 Primary Standard Atmosphere 23∘C23 raised to the composed with power C 23∘C23 raised to the composed with power C Alternative Atmosphere 27∘C27 raised to the composed with power C RH (primarily for tropical zones) 27∘C27 raised to the composed with power C 20∘C20 raised to the composed with power C Tolerance Classes Standard ( ±2∘Cplus or minus 2 raised to the composed with power C ) and Closer ( ±1∘Cplus or minus 1 raised to the composed with power C ±1∘Cplus or minus 1 raised to the composed with power C RH) and Class 2 ( ±2∘Cplus or minus 2 raised to the composed with power C Always refer to the official ASTM International standard
± 2 °C for temperature; ± 10% for humidity. (Note: Closer tolerances of ± 1 °C and ± 5% RH are required for referee testing or precise electrical evaluations). 2. Standard Conditioning Procedures
Which (e.g., tensile, impact, dielectric strength) will you perform after conditioning?
Plastics are hygroscopic and thermostatically sensitive. If you don't condition them: may fluctuate based on moisture content. Impact resistance can change with temperature shifts. Dimensional stability might fail due to thermal expansion.