Standard Specification for
This standard is issued under the fixed designation A 550; 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.
Click below to download Astm A 550 – 78 (Reapproved 2000) pdf free
Click here to download Astm A 543/A 543M – 93 (Reapproved 1999) Pdf Free Download