The standard was approved February 1964. It covers ferric sulfate for use in the treatment of municipal and industrial water supplies. Includes sections on the following: information supplied by purchaser, cautions, impurities, rejection, physical requirements, chemical requirements, affidavit of compliance, sampling, packing and shipping, marking, and various testing methods on moisture, insoluble matter, soluble ferrous iron, soluble ferric iron, and free acid.