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"In general, the physical and electrical properties of plastics are influenced by temperature and relative humidity in a manner that materially affects test results."
The official and most reliable way to obtain the standard is through ASTM International. You can purchase the PDF, redline versions, or hard copies directly from their website. It is also available through technical document resellers like IHS Markit or Techstreet. Important Note on "Free PDF" Searches astm d618-21 pdf
This pragmatic approach makes the standard usable for general purchase specifications and product control tests, where consistency and speed are essential.
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No. "Laboratory ambient" varies daily. D618-21 requires a controlled chamber, not a room air conditioner.
The most common environment used for Procedure A is the "Standard Laboratory Atmosphere". It is strictly defined as: It is also available through technical document resellers
The standard defines several specific procedures based on the material's requirements: : Standard laboratory atmosphere (typically relative humidity). Procedure B : Oven conditioning followed by desiccation. Procedure C : Conditioning via water immersion. Procedure D : Exposure to high humidity conditions. Key Significance
Ensures the physical values generated in the lab are true to the material's properties at the specified conditions.
This practice ensures that all plastic materials reach equilibrium in temperature and moisture before physical, mechanical, or electrical evaluation. Eliminating environmental variables allows laboratories worldwide to achieve consistent, repeatable results. Overview of ASTM D618-21
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