1961 Maeda Chemical Industry Co. merged with Asahi Chemical Industry Co. to establish Sankyo Kasei Co.Capital:30 millionCapital increase:50 million 1962 Sodium hydrosulfide plant completed (Akitsu Plant) 1964 Sodium sulfate plant completed (Mihara Plant) 1967 Crystal sodium sulfide plant No.1 completed (Akitsu Plant) 1969 Sodium hydrosulfide technical liquid plant (Kainan Work)Crystal sodium sulfide plant No.2, and sodium sulfide plant completed (Akitsu Plant) 1970 Capital increase:90 million 1971 Joint venture "Korea Sankyo Kasei Co." established.Pharmaceutical intermediate "Guayacol" Plant completed (Mihara Plant)Heavy metal remover "Santhiol" production started (5 related patents were filed in 14 countries) 1972 Heavy metal remover "Santhiol" was awarded with the 22nd Industrial Technical Prize of Osaka Industrial Research Association 1973 Reduction plant completed (Akitsu Plant) 1974 Polymer additive "Zisnet" production started (40 related patents)High temperature high pressure plant completed (Akitsu Plant) 1975 Integral waste water treatment plant completed (Akitsu Plant)Sodium thiosulfate plant completed (Akitsu Plant)Capital increase :100 million 1977 Integral waste water treatment plant completed (Mihara Plant) 1979 UV absorber "Zislizer" production started. 1981 Photoresist additive (benzophenone system) production started. 1983 Fine chemical multi-plants "F-1", "F-2" completed 1985 Flake plant, contact oxidation waste water treatment plant completed. 1988 Tokyo Business Office opened. 1991Clean room plant "F-3" completed.Ultra-pure water facility installed. 1993 Capital increase to290 million 1994 Fine chemical multi-plant "F-5" (GMP standard) completed.Fine chemical multi-plant "F-6" completed. 1996 Fine chemical multi-plant "F-8" completed. 1997 Fine chemical multi-plant "F-7" completed.Pilot plant completed. 1999 ISO 9002 approval obtained for production of photoresist intermediate. 2001 New corporate slogan "Human Chemistry" announced. 2003 Fine chemical multi-plant "F-10" completed.ISO 9001 (2000 version) approval obtained for Head Office, Tokyo Office and Atitsu Plant. 2005 ISO 14001 approval obtained for Head Office, Tokyo Office and Atitsu Plant.