American Society for Testing and Materials (ASTM). Current edition approved Feb. 1, 2006. Published February 2006. Originally approved in 1918. Last previous edition approved in 2001 as B 21/B 21M – 01. 7 p. This specification establishes the requirements for naval brass rod, bar, and shapes produced from Copper Alloy UNS Nos. C46200, C46400, C47940, C48200, or C48500.