| 1968September | Founding of Keiwa Rozai Co. Ltd., and start of pulverization process and sale of refractory raw materials. |
| December | Factory No. 1 completed. Start of coarse pulverization. |
| 1971May | Founding of Toyo Shoji Co. Ltd., and start of trade business. |
| 1973December | Factory No. 2 completed, installation of fine pulverization and classification plant. |
| 1975February | Toyo Shoji Co. absorbed by Keiwa Rozai. |
| 1979April | West Factory (Nishi Kojo) (currently Factory No. 5) coarse pulverization plant completed. |
| 1981November | Joint venture with Repco Co. to establish Canada Mica. |
| 1985January | Factory No. 3 completed, installation of a large, fine-pulverization plant. |
| 2000December | Chinese corporation Yingkou keiwa powder processing industry Co,. LTD. established. |
| 2002December | Founding of the Bizen factory, and start of pulverization for ferroalloys. |
| 2004February | Establishment of Keiwa Technos Co. for facility and plant design and construction. |
| 2005September | Move and expansion of the Bizen factory. Start of operations as the East Factory (Higashi Kojo) an integrated facility dedicated to the handling of ferroalloys, from pulverization and calcination to drying. |
| 2010April | Keiwa Technos Co. absorbed by Keiwa Rozai. |
| 2018January | Establishment of facilities in Vietnam and start of local production. |
| April | Company name changed to Keiwa Fine Material Co., Ltd. |