1.1 This specification covers refined silver in cast bar form in three grades as follows:

1.1.1 Grade 99.90 (UNS P07020)-Silver having a minimum fineness of 999.0 commonly referred to as "commercial bar" or "bullion."

1.1.2 Grade 99.95 (UNS P07015)-Silver having a minimum fineness of 999.5.

1.1.3 Grade 99.99 (UNS P07010)-A premium grade having a minimum fineness of 999.9.

1.2 The values stated in inch-pound units are to be regarded as the standard.