Standard Specification for
Structural Insulating Board, Calcium Silicate1
This standard is issued under the fixed designation C 656; 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 Astm C 656 – 94a (Reapproved 2001) pdf free download