- Founded under the firm name Sanko Shokai.
- Established Sanko Kagaku Kogyosho in Arao city.
- Changed the firm organization and the firm name from Sanko Shokai to Sanko Co.,Ltd.
- Started the formulating of agricultural chemicals as Kyushu Plant,Nippon Soda Co.,Ltd.
- Started the production of phenyl-phenols.
- Reorganized Sanko Kagaku Kogyosho, and with the capital 2million yen,established Sanko Chemical Co.,Ltd.
- Controlled and managed Sanko Sewing Co.,Ltd.
- Started the formulating of agricultural chemicals as Arao Plant,Kumiai Kagaku Kogyo Co.,Ltd.
- Completed a synthesis plant of paraphenylphenol (P-PP) and started its production.
- Started the production of a new organic phosphorus compound HCA.
- Completed a synthesis plant of orthophenylphenol (O-PP)
- Constructed Shiga Plant and started the production of a developer for carbonless copying paper.
- Established Sanko Research & Development Laboratories Co.,Ltd. Constructed its laboratory at Ibaraki city,Osaka Prefecture in May,1982.
- Started the production of flame retardant GHM.
- Constructed a plant for new Speciality Chemicals in Arao site.
- Acquired Dai-ichi Nylon Kogyo Co.,Ltd. and established Shiga Buisiness Office.
- Established Sanko Europe GmbH (Dusseldorf,Reorganized its Representative office).
- Set up Shiga Laboratory, and constructed a multipurpose Plant for developmant.
- Established Sanko Medic Co.,Ltd.
- Sanko Co.,Ltd. merged with Sanko Chemical Co.,Ltd.
- Established Sanko Tac Sysrem Co.,Ltd.
- Constructed a plant for HCA (HP-1 plant) at Arao site.
- Established Sanko (Thailand) CO.,ltd. (Bangkok).
- Constructed a resin molding plant at Shiga site.
- Established SANKO U.S.A., Inc. (Chicago).
- Constructed a plant for NKS at Arao site.
- Established Representative office in Shanghai ,China.
- Established SANKO TRADING (SHANGHAI) CO.,LTD. (Reorganized its Representative office).
- Constructed a plant for HCA(HP-2 Plant) at Arao site
- Constructed a plant for HCA(HP-3 Plant) at Arao site
- Constructed Ariake site.
- Expanded Moriyama Works of Sanko Medic Co.,Ltd. at Shiga site.
- Moved our headquarters to Tokyo.
- Established SANKO VINA CO.,ltd.(Vietnam)
- Established SANKO ASIA CO.,ltd.(Bangkok, Thailand)