On May 13, 2009, the State Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) QSIQ Letter [2009] 258 "Notice on Approving 121 National Standard Substances such as"Specific Surface Area of Nanometer Alumina"approved and issued 26 national standard substances developed by Jinan Mass Standard Technology Co., Ltd. The license numbers for manufacturing measuring instruments are"National Standard 10000926 and 10000934".