American Society for Testing and Materials (ASTM). Current edition approved June 1, 2006. Published July 2006. Originally approved in 1962. Last previous edition approved in 2000 as B 388 – 00. 7 p. This specification covers thermostat metals in the form of sheet or strip that are used for the temperature-sensitive elements of devices for controlling, compensating, or indicating temperature and is intended to supply acceptance requirements to purchasers ordering this material by type designation.