What role does benzene cost play in styrene pricing, and how are margins squeezed?

Benzene is the dominant cost driver, accounting for 78% of styrene's mass and about 63% of its production cost. International benzene pricing is often benchmarked at naphtha plus $120/ton, a spread that historically covers production and trader margins. Recently, that spread has widened to near $300/ton due to firm crude oil, inflating styrene's feedstock costs. For downstream derivatives, styrene represents roughly 70% of EPS/PS costs, about 50% of ABS costs (with a 0.63 consumption ratio), and 25% of unsaturated polyester resin costs. This cost pass-through chain means benzene price moves directly dictate styrene's floor, while oversupply caps upside—squeezing producer margins between high feedstock and weak derivative demand.