Standard Speciﬁcation for General Requirements for Wrought Precious Metal Electrical Contact Materials1
This preferred is issued beneath the ﬁxed designation b 476; the number straight away following the designation indicates the yr of original adoption or, within the case of revision, the year of ultimate revision. A variety of in parentheses suggests the yr of last reapproval. A superscript epsilon (e) suggests a piece of writing alternate for the reason that final revision or reapproval.
This wellknown has been permitted to be used via organizations of the branch of defense.
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You can also get ASTM B 475 – 96 International standard