Thai Asahi Caustic Soda Co., Ltd. was initially founded in 1964 as a joint venture between a group of Thai entrepreneurs and Asahi Glass Co., Ltd. of Japan. The company was granted promotional privileges by the Board of Investment (BOl). Two years later, the company’s first production plant in Samut Prakan was completed and commercial production of sodium hydroxide commenced. The company underwent a major change in 1988 when Thai Asahi Caustic Soda Co., Ltd. was renamed THASCO Chemical Co., Ltd. (THASCO) and has become to AGC Chemicals (Thailand) Co., Ltd (ACTH), the name the company bears today.
ACTHs record as a leader in the chemical industry is marked by many exciting milestones and surpassing achievements. The following timeline documents the highlights:

1964 The company was established and started building its first factory.
1966 Production of sodium hydroxide commenced at the company’s factory in Samut Prakan.

1969-1983 Backed by BOl promotional privileges, the company expanded its factory in order to produce chlor-alkali to meet growing demand from secondary industries.

1985 The company obtained BOl privileges for the production of refined salt.
1987 Construction of the refined salt plant began.

1989 • The company commenced production of refined salt using environmentally-friendly technology transferred from Europe.
• The company underwent an expansion to increase production capacity of sodium hydroxide.

1991 The company tripled its production of refined salt.

1994 • The company relocated its refined salt production plant to Nakhon Ratchasima and formed a new company under a new joint venture with Vinythai Public Company Limited and Thai Refined Salt Co., Ltd.
• A second production plant was established at the Eastern Industrial Estate, Map Ta Phut, Rayong.

1996-1997 The Rayong plant commenced production of potassium carbonate. Production of chlor-alkali also came on-stream in 1997.

1998 The plant at Samut Prakan was awarded the ISO 9002:

1994 quality standard, approved by BVQI.

1999 Production of sodium hydroxide micropearls commenced, making the company the first and only producer of sodium hydroxide micropearls in Thailand.

2000 The plant at Rayong achieved the ISO 14001:1996 environmental standard as assessed by BVQI.

2001 Asahi Glass Co., Ltd. of Japan raised its ownership stake to 100 per cent.

2004 The Rayong plant was approved for ISO 9001:2000 quality standard certification by BVQI.

2005 • The Mercury Cells Process for producing caustic soda and chlorine was replaced by an environmentally-friendly Ion-exchange Membrane Process at the Samut Prakan plant.
The company combined the ISO 9001 :2000 quality standard certifications of its two factories, as assessed by BVQI.

2006 The Rayong plant underwent an expansion in order to increase production of chlor-alkali. The company has thus maintained its position as the largest producer of sodium hydroxide in Thailand.

2007 THASCO Chemical Co.,Ltd was renamed to AGC Chemicals (Thailand) Co.,Ltd