: This standard describes measuring methods only; it does not establish limits of acceptability for any measured porosity value. Accessing the PDF
The original ASTM E2109-01 was issued December 10, 2001. The designation "E2109-01" refers to the 2001 edition—the numbers after the dash represent the year of initial issuance. Reapprovals (shown with a second year in parentheses) indicate the standard was reviewed and confirmed without technical changes, but active compliance typically requires the most recent version. astm e2109-01 pdf