ASTM B 671 - 81 (Reapproved 2005) Standard Specification for Refined Iridium

American Society for Testing and Materials (ASTM). Current edition approved May 1, 2005. Published June 2005. Originally approved in 1980. Last previous edition approved in 1999 as B 671 – 81 (1999). 2 p. This specification covers refined iridium as sponge and powder in two grades as follows:
1 Grade 99.80 (UNS PO6100)— Iridium having a
2 Grade 99.90— Iridium having a purity of 99.90 %.