SM (styrene monomer) is produced by ethylene and benzene. Global SM production in 2012 came in at 29.0 mn tons, while global capacity in 2012 was 33.4 mn tons. The major downstream applications are PS (polystyrene), SBR, and ABS. The main proudcers in the world are Styrolution, LyondellBasell, Formosa Chemicals & Fibre etc...
