Polymers
Styrene Acrylonitrile (SAN)
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&49; by weight styrene and between 20 and 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.
Properties
- Excellent Rigidity/Stiffness
- Excellent Load-Bearing Capacity
- Excellent Chemical Resistance
- High Flexural Strength
- Good Appearance
- Good Color-Ability
- Good Clarity
- Good Thermal Resistance
- Good Dimensional Stability
- Good Heat Resistance
- Easily Processed
Applications
Styrene Acrylonitrile resin is a copolymer plastic commonly used in place of Polystyrene due to its greater thermal resistance.
SAN copolymers are produced by the polymerization reaction of styrenes and acrylonitrile. The properties are dependent on the acrylonitrile content. Commercial grades of SAN offer different acrylonitrile molecular masses.
The transparency of SAN makes it one of the few plastics that can be used in clear applications. It’s glass-like clarity makes it a preferred plastic in the housewares market.
SAN is commonly used in the following applications:
- Dishwasher-Safe Containers
- Disposable Lighters
- Brush Bristles
- Auto Gauge Covers
- Cosmetic Cases
- Medical Syringes
- Reflectors
- Refrigerator Doors
- Battery Cases
