Standard Test Method for Grammage of Paper and Paperboard (Mass Per Unit Area)1
This preferred is issued beneath the ﬁxed designation d 646; the quantity without delay following the designation suggests the yr of original adoption or, within the case of revision, the yr of final revision. More than a few in parentheses shows the 12 months of closing reapproval. A superscript epsilon (e) suggests an article trade because the last revision or reapproval.
This standard has been authorized to be used by means of businesses of the department of protection.
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