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PT Styrindo Mono Indonesia (SMI) was established in 1991.

is the only styrene monomer manufacturer in Indonesia to date with production capacity of 340KTA. Located in Bojonegara, Serang, Banten, which is located 40km away from CAP facilities.

Styrene monomer, SMI’s main product, is a material for downstream industry products such as PS (Polystyrene), EPS (Expanded Polystyrene), SAN (Styrene Acrylonitrile), ABS (Acrylonitrile Butadiene Styrene), SBR (Styrene Butadiene Rubber), SBL (Styrene Butadiene Latex) and UPR (Unsaturated Polyester Resin).

SMI owns PT Redeco Petrolin Utama (RPU) as its subsidiary. SMI is also collaborating with Compagnie Financiere Du Groupe Michelin (Michelin) to create a joint venture of synthetic rubber manufacturer, namely PT Synthetic Rubber Indonesia