ZIBO AGC ALUMINA MATERIALS CO., Ltd. (primitive name: Zibo Asahi Glass Alumina Materials CO., Ltd) is a China-Japan joint-venture company between Zibo Gongtao Refractory CO., Ltd. (GTC) and AGC Co.,Ltd. of Japan( primitive name is Asahi Glass Co., Ltd. of Japan) incorporated on 24th December 1993. In 2019 the company's name is changed to ZIBO AGC ALUMINA MATERIALS CO., Ltd. (ZAC for short).