1973 Grand Pacific Petrochemical Corporation (GPPC) was founded under the name of Delta Petrochemical Corporation..
1974 Delta Petrochemical's styrene monomer plant No. 1, also the first in Taiwan, was built, with an annual capacity of 80,000 metric tons.
1981 Delta Petrochemical's styrene monomer plant No. 2 was built, with an annual capacity of 100,000 metric tons.
1984 Following a corporate reorganization, Delta Petrochemical became Grand Pacific Petrochemical Corp. The company's first ABS/SAN plant was completed. With an annual production capacity of 20,000 metric tons, the plant marked the first step in Grand Pacific's product diversification and vertical integration strategy.
1987 Expansion of the ABS/SAN plant to increase capacity to 33,000 metric tons was completed.
1988 GPPC was listed on the Taiwan Stock Exchange.
1990 GPPC acquired GPPC Chemical, a high-impact polystyrene (HIPS) producer.
1991 GPPC acquired BC Chemical, a high-impact and general purpose polystyrene (GPPS) producer.
GPPC invested in Grand Pacific Chemical (Thailand) Co., Ltd., and acquired a Thai ABS plant with an annual production capacity of 8,000 metric tons.
1992 ABS/SAN production capacity was expanded to 50,000 metric tons per year.
GPPC invested in CITC Enterprise in Malaysia, a pre-colored plastic compounder.
1994 Annual ABS/SAN production capacity was increased to 80,000 metric tons.
Debottleneck of second SM plant increased total SM production capacity to 210,000 metric tons per year.
1995 GPPC acquired Delta Gas Products, a high purity hydrogen producer.
1996 GPPC subsidiary, Zhengjiang GPPC Chemical Co., Ltd., was founded in Jiangsu Province, China, with annual production capacities of 40,000 metric tons of SAN/ABS.
Grand Pacific Chemical (Thailand) Co., Ltd., expanded annual ABS capacity to 18,000 metric tons.
1997 GPPC was awarded both ISO 9002 and ISO 14001 certification by the Bureau of Commodity Inspection and Quarantine, Ministry of Economic Affairs, R.O.C..
GPPC ventured itself into the arena of high-tech fields.
1999 GPPC's styrene monomer plant No. 3 was built, with a total annual production capacity of 330,000 metric tons.
2000 BC Chemical expanded its annual HIPS capacity to 56,000 metric tons. Zhengjiang GPPC Chemical Co., Ltd. expanded annual SAN/ABS capacity to 80,000 metric tons.
2001 GPPC was awarded ISO 9001/2K Version certification by the Bureau of Standard Metrology and Inspection, Ministry of Economic Affairs, R.O.C..
2002 Zhengjiang GPPC Chemical Co., Ltd. expanded its annual SAN/ABS capacity to 140,000 metric tons.
2003 GPPC was awarded SONY "Green Partner" Certificate, and OHSAS 18001certification by SGS.
2005

GPPC announced to expand Zhengiang GPPC's SAN/ABS capacity to 250,000 metric tons per year by the first quarter of 2007.
GPPC was award ASUS "Green Management System" Certificate.