For many years the unchallenged dominant player in Saudi petrochemicals, Sabic will this year see new competition from two large-scale joint ventures under development by state petroleum giant Saudi Aramco.

First to be completed will be the 3.22mn tons/year Sadara joint venture with US firm Dow Chemical, with the 2.6mn t/y Rabigh 2 venture with Japan’s Sumitomo due to start up units this year and next. This week Sadara signed up its third customer within the adjacent PlasChem Park,...