On May 27, 2015, the State Quality Inspection and Quarantine Letter [2015] 235 of the State Administration of Quality Supervision, Inspection and Quarantine approved the release of the national standard materials such as "Ferrosilicon, Ferrosilicon Nitride, Vanadium Titanomagnetite and Chromite" developed by Jinan Zhongbiao Science and Technology Co., Ltd. The license number for manufacturing measuring instruments is "National Standard 10001419 and National Standard 10001423".