American Society for Testing and Materials (ASTM). Current edition approved Nov. 1, 2005. Published February 2006. Originally approved in 1967. Last previous edition approved in 2000 as B 339 - 00. 4 p. This specification covers refined tin in pig form recovered and cast from primary and secondary tin-bearing materials. One grade of tin metal is specified and is designated by the grade letter shown in Table 1.