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).