American Society for Testing and Materials (ASTM). Current edition approved Mar. 1, 2005. Published April 2005. Originally approved in 1984. Last previous edition approved in 1999 as B 68M – 99. 5 p. This specification establishes the requirements for bright annealed seamless copper tube suitable for use in refrigeration, oil lines, gasoline lines, and so forth, where tube with an interior surface essentially free from scale and dirt is required.