Standard Practice for
Dry Preparation of Soil Samples for Particle-Size Analysis
and Determination of Soil Constants1
This widespread is issued below the constant designation d 421; the quantity at once following the designation suggests the yr of
original adoption or, in the case of revision, the 12 months of final revision. quite a number in parentheses indicates the year of closing reapproval. a
superscript epsilon (e) suggests an editorial alternate since the ultimate revision or reapproval.
This general has been accredited to be used by way of companies of the department of protection.
click below to download Astm D 421 – 85 (Reapproved 2002) pdf free
click here to download Astm D 420 – 98 (Reapproved 2003) pdf free