1950,
Ihachi Takeshita started production and sales of calcium carbonate in Matumoto Lime Industrial Company (Samegai).
1954, March,
launched Ohmi Chemical Industry Co., Ltd in current Nagasawa, Maibara-city, Shiga prefecture as Matsumoto Lime Industrial Company・Omi Chemical Industrial Company.
1961, March,
established Omi Chemical Industrial Company.
September,
Opened the first outdoor golf range in Shiga prefecture.
1963, April,
Established Osaka branch
1964, June,
Started production and sales of Bubble-Prevention Agent, CML
1965,
Started production and sales of ”Neocal", a veterinary medicinal product.
Obtained the labeling permission of Japan Industrial Standards (JIS) in Light Calcium Carbonate
1968, January,
Acquired Samegai Carbonation Industrial Co., Ltd and launched Ohmi Chemical Industry Co., Ltd Samegai factory.
1969,
Opened a CML factory
1971,
Acquired a factory in Ehime prefecture , started production of white carbon, "Himesil", .
1973,
Started production of "Calbit", an acid acceptor for fluoro rubbers.
1974,
Obtained the food additives manufacturing licence of light calcium carbonate
Started production of "Collocalso T".
1975,
Started ZD activity.
1977,
Started production of "Collocalso E".
Started rubber kneading at a Samegai factory.
1978,
Started production of "Collocalso MG", "Collocalso S".
Built a research and examination building in the main office.
Established Samegai Chemical Conversion Co., Ltd inside Samegai factory.
Started water removal refinement of synthetic rubber
Started rubber molding process with a press machine at Samegai factory.
Purchased Samegai Dormitory.
1979, March,
Joined in Japan Water Works Association, designated as a licensed factory.
Started production of rubber products for water and sewage.
1980,
Built a CML factory,
1981,
Installed waste water pollution prevention equipment based on the environmental policy of Lake Biwa.
Started production of soft-seal valves for water and sewage.
Started TQC activity (current QC activity).
1982,
Installed waste water pollution prevention equipment in Samegai factory.
1984,
Built an office building at Samegai factory.
1986, May,
Built a press factory at Samegai factory.
1988, May,
Completed a new office building of the main office.
1989,
Capital participation in the Rubber section of the joint venture company, OKM Malaysia.
1990, August,
Built a product warehouse.
1991, March,
Built a resin compound factory (current the first factory).
Started production of resin pellets.
1993,
Toshitaka Takeshita became the second president.
1997,
Completed the new factory for acid acceptors for fluoro rubbers .
1998,
Transferred all the production of calcium carbonate to the main factory.
2003, May,
Obtained ISO9001 in the CML section.
2006,
Built the second resin factory.
2013,
Obtained ISO9001 in the resin section.
2016,
Using an existing building of Samegai factory, started the second press factory.
2018,
Obtained ISO9001 in Samegai factory.

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