In 1968, the first commercial production of copper cynide in Korea has been successfully achieved by IL-YUN LEE, the founder of Chung Wha Sa Co., Ltd.(CWS). He opened the current "Ansan factory for cyanides" located in Banwol Electroplating Industrial Park in March 1, 1979. The company name is "Chung Wha Sa" (Cyanides + Company) for manufacturing copper cyanide and other metallic cyanides. CWS has established the "top brand" with the excellent qualities and services through 3 decades. Now, it has 35% of market share of metallic cyanides such as copper cyanide, Brass Salt, Imitation Gold and others. CWS will do our best effort to become "Electroplating Chemical World Service".

In 1999, CWS developed and commercialized successfully "TPD" of a kind of hole transfer materials for Organic Photo-Conductor which is a part of cartridge in a laser printer. Since 2002, CWS has developed and manufactured Alq3, NPD and other "OEM" materials for OLED. Recently the need of OLED materials is quickly increased due to abrupt growth of AM-OLED market. In the last September, CWS move the R&D center, "PhotoChem R&D" to "Osan Factory" in Nueup Dong Industrial Area in Osan for preparing the future market of OLED materials. CWS now has built the product plant for OLED materials and acquired all permissions and licenses from Osan City.

All CWS's staffs do work hard to become the best supplier of "decorative electroplating materials" including metallic cyanides. In addition, Chung Wha Sa Co., Ltd.(CWS) will become one of the best OLED material suppliers and grow to a special "Chemical World Service" company.