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Yes. The 2021 version supersedes all earlier editions (such as D4546‑14, D4546‑08, etc.). Always use the most current version for design and compliance. astm d454621 pdf
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Measures the swell pressure and free swell percentage. 2. Test Method B (Single-Point Wetting-After-Loading) Always use the most current version for design
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The "-21" suffix denotes that the standard was updated or reapproved in the year 2021. ASTM standards undergo periodic reviews to refine methodologies, improve precision, and incorporate modern laboratory technologies.
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