The expansion of the Singapore Petrochemical Complex, known as the Complex II project, was launched on 1 March 1994. This S$3.4 billion project involved:

• The expansion at Pulau Ayer Merbau of the existing plants of PCS, TPC, CPSC, DSPL, JIIG and RHCS.
• The establishment of a new downstream Styrene Monomer/Propylene Oxide (SMPO) plant by Seraya Chemicals Singapore (Private) Limited (SCSL) on nearby Pulau Seraya.

While construction was in progress in 1995/1996, two more new downstream projects, to be sited on the adjacent Pulau Sakra, were added to the expansion fold. These were:

• A Vinyl Acetate Monomer (VAM) plant by Celanese Singapore Pte Ltd (CSPL). Start-up was on stream in mid- 1997.
• With Sumitomo Chemical Singapore Pte Ltd (SCS) as the core company, the Singapore MMA and Acrylic Group (SMAG) Complex operate several plants that produce methylmethacrylate monomer (MMA) and polymers (PMMA) and acrylic acid (and its derivatives). Start-up was in 2nd half of 1998.

PCS is continuing its role as the upstream company with the supply of additional ethylene, propylene, acetylene and benzene, as well as utilities and common services through a second cracker.

The second cracker, a world-scale plant, doubles the company's present capacity and makes PCS one of the largest producer of olefins in the region. It considerably enhances the competitive position of PCS and also provides increased feedstock flexibility for the whole complex.

The Complex II was started up in 2nd quarter of 1997.