This is the ICIS pricing methodology for polystyrene. ICIS quotes polystyrene prices in Europe, Asia-Pacific, North America, Middle East/South Asia and Latin America.

ICIS continuously develops, reviews and revises its methodologies in consultation with industry participants. Previous versions of this methodology can be found under Archived Documents. For a copy of an archived methodology document, please email

To find out more, please see Polystyrene Methodology – 7 March 2023