American Society for Testing and Materials (ASTM). Current edition approved March 15, 2006. Published April 2006. Originally approved in 1984. Last previous edition approved in 2000 as B 135M – 00. 6 p. This specification covers seamless round and rectangular including square copper alloy tube in straight lengths of UNS Alloy Nos. C22000, C23000, C26000, C27000, C27200, C27400, C28000, C33000, C33200, C37000, C44300.