The contracts are among the last on the world-scale complex, which will produce polyethylene, polycarbonates, cumene and phenols.

Jubail is touted as the largest standalone petrochemicals complex ever built.

Saudi Kayan is a joint venture of Saudi Basic Industries Corporation (Sabic) and Al-Kayan Petrochemical Company, also from Saudi Arabia.

The company is expected to stage an initial public offering of 45 per cent of its capital in 2008.