| 1911 |
The Rasa Island Phosphate a limited Partnership was founded. |
| 1913 |
The Partnership was reorganized as the Rasa Island Phosphate Ore, Ltd. |
| 1920 |
The Company started the production of lime superphosphate at Osaka factory. |
| 1934 |
The Company was renamed to Rasa Industries, Ltd.(hereinafter “Rasa”) |
| 1936 |
Rasa built Taro mining station. |
| 1937 |
Rasa was authorized as the proprietor of the Rasa Island (Okinawa Pref.). |
| 1941 |
Rasa started the production of machinery at Hainuzuka factory (Fukuoka Pref.). |
| 1941 |
Rasa merged with Taio Sangyo Co., Ltd. |
| 1954 |
Rasa started the production of yellow phosphorus and phosphoric acid. |
| 1958 |
Rasa started the production of flocculent for water treatment. |
| 1965 |
Rasa started the production of anhydrous phosphoric acid and metal surface processing materials. |
| 1971 |
Rasa withdrew from the mining business. |
| 1972 |
Rasa started the production of high purity red phosphorus for electronic use at Osaka factory. |
| 1972 |
Machinery Division started water treatment business. |
| 1973 |
Rasa started production of boron trioxide at Osaka factory. |
| 1980 |
Rasa started the production of pipe jacking machines at Hainuzuka factory. |
| 1981 |
Miyako factory started production of gallium. |
| 1981 |
Rasa withdrew from the smelting business. |
| 1981 |
Rasa started the reclaim of catalysts for oil refining. |
| 1982 |
Rasa started the production of high purity Gallium at Osaka factory. |
| 1983 |
Rasa withdrew from the fertilizer business. |
| 1984 |
Rasa started the silicon wafer reclaim at Osaka factory. |
| 1985 |
Rasa set up the Electronic Materials Division, constructed Sanbongi factory and started the silicon wafer reclaim and the production of high purity inorganic materials. |
| 1986 |
The Machinery Division started the precision machine processing. |
| 1987 |
Sanbongi factory started production of indium. |
| 1987 |
Rasa set up new facility for the production of the flocculent (Poli Aluminum Chloride) at Sanbongi factory. |
| 1989 |
Chemicals Division started production of high-performance ferric chloride. |
| 1989 |
Rasa started production of deodorizer at Osaka factory. |
| 1989 |
Rasa started the sales of SOG,dielectric films. |
| 1992 |
Chemicals Division started sales of powdered activated carbon and started business of antibacterial agent. |
| 1993 |
Rasa established, Noda factory (Chiba Pref.) and started the production of the flocculent. |
| 1996 |
Rasa established, Isesaki factory (Gumma Pref.) and started the production of electronic materials. |
| 1996 |
Rasa started the rent of Miyako Shopping Center premises. |
| 1998 |
Sanbongi factory, electronic material division obtained ISO9002. |
| 1999 |
Osaka factory obtained ISO9002 for the production of high purity phosphoric acid. |
| 1999 |
Sanbongi factory obtained ISO14001. |
| 2001 |
Isesaki factory completed production facility for high-performance deodorant. |
| 2003 |
The Precision Machine Processing division obtained ISO9001 for the electronic beam welding |
| 2003 |
Rasa established a subsidiary (Rasa Technology Taiwan Ltd.-RTT) in Taiwan for the production of high purity agent to IT industries. |
| 2005 |
RTT completed the construction of a new factory. |
| 2007 |
Chemicals division completed production facility for high-grade copper powder. |
| 2007 |
RTT enhanced production line for high purity phosphoric acid. |
| 2010 |
Rasa merged with Nippon CRI as absorption type merger transferred to NCRI Department. |
| 2010 |
Rasa withdrew from silicon wafer reclaim at Sanbongi factory. |
| 2013 |
Sanbongi factory started production of AgX®. |
| 2016 |
Isesaki factory completed installation of facility for inorganic phosphate. |
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