ASTM Standards ASTM B561-23 pdf free download – Standard Specification For Refined Platinum ASTM B561-23 pdf free download - Standard Specification For Refined Platinum. This specification covers refined platinum as sponge, cast bar, and wrought forms (Note 1) in two grades as follows: 1.1.1Grade 99.95 (UNS PO4995) - Platinum having... 09-11 Read More