Styrene-Acrylonitrile (SAN)

Properties and Applications

Poly(styrene-co-acrylonitrile) (SAN) is a transparent and heat resistant thermoplastic copolymer produced by free radical polymerization of styrene and acrylonitrile. The relative composition is typically between 60 and 80% by weight styrene and between 20 an 40% acrylonitrile.

Styrene-co-acrylonitrile copolymers combine the clarity and rigidity of polystyrene with the hardness and strength of polyacrylonitrile. Compared to styrene polymers, SANs have much improved chemical and solvent resistance, better heat stability, improved mechanical properties and a somewhat higher heat-deflection temperature. The copolymers also have much improved creep resistance and weatherability compared to polystyrene.

Parts and films produced from SAN offer exceptional brilliance and transparency and are very durable at relative low cost. Becasue of these properties, San resins are often used for high quality packaging as well as for transparent kitchenware and houseware articles like trays, toothbrush handles, knobs, mixing bowls, jars, beakers, and storage containers. Other applications include housings, casings and covers for instruments and appliances.

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