Standard Practice for
Dry Preparation of Soil Samples for Particle-Size Analysis
and Determination of Soil Constants1

This standard is issued under the fixed designation D 421; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.

Click below to download  Astm D 421 – 85 (Reapproved 2002) Pdf free

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Click here to download Astm D 420 – 98 (Reapproved 2003) Pdf Free Download