Dr. Charng Ratanarat had studied in Germany and had the vision to make Thailand independent from importing bulk chemicals, commodities and supplies.

The Siam Chemicals Company Limited was the first in Thailand to produce bulk blend fertilizer in 1968 which was marketed under the brand name Three Nagas.

The construction of Wharf 5C, the company's riverside harbor and port was completed in 1971 and general cargo warehouses and a tank farm were built.

[1] In 1997 the group's laboratory for analytical chemistry was registered with the Ministry of Industry for analyzing waste water and pollutants, to provide services also to other factories in Samutprakarn.

[3] The Siam Fine Chemicals manufactures engine and industrial lubricants and trades base oils and solvents and provides rental services for warehouses and tanks.

It has produces a variety of gases used in hospitals and for medical purposes, including oxygen, argon, nitrous oxide, nitrogen and coolants for air-conditioners and fills these into cylinders.

Recently, the company has acquired real estate in Nakhon Srithammarat and Surathani, and produces bulk-blended fertilizers in the Phayao Province.