Astm D61821 Pdf Jun 2026
min, then excess water is removed with blotting paper before testing. This simulates wet conditions, which often weaken adhesion. 5. Evaluation and Reporting
The "21" in the designation indicates that the most recent major revision was approved in . You can view or purchase the official document at the ASTM International website or through authorized distributors like the ANSI Webstore and Accuris Standards Store . Core Significance and Purpose
In the world of material science and plastic manufacturing, accuracy in testing is not just about the machinery used; it is about the preparation of the specimen. Plastics are inherently sensitive to their environmental history, particularly temperature and humidity. , often referred to by practitioners seeking the ASTM D61821 PDF , is the definitive standard practice for conditioning plastics for testing. astm d61821 pdf
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Prevents early failure of expensive leather goods. min, then excess water is removed with blotting
Subject materials to specific conditions to predict how they will behave in service. Key Conditioning Procedures
A: Conditioning means placing the plastic test specimens in a controlled environment (specific temperature and relative humidity) for a specified amount of time before they are mechanically or electrically tested. This ensures that the test results are not skewed by the material's exposure history. Evaluation and Reporting The "21" in the designation
Water immersion at 50°C for 48 hours, then cooled to 23°C before testing. Procedure D: High humidity conditioning (96% RH at 23°C). Notation and Technical Details
: The test serves as an indicator of the overall condition and quality of the oil, guiding decisions on whether the oil needs to be replaced or if further detailed analysis is required.
The test method involves extracting the plastic material with a solvent, followed by analysis of the extract to determine the amount of extractable content.
If a specific material specification (found in ASTM D4000 ) contradicts this practice, the material-specific standard takes precedence.