SAN
Styrene Acrylonitrile
Glass Transition (Tg)
105–110 °C
Melting Point (Tm)
— (amorphous)
Density
1.06–1.08 g/cm³
CAS Number
9003-54-7
Recycling Code
♺ 7
Category
Engineering
Repeat Unit
–[CH₂–CH(C₆H₅)]ₓ–[CH₂–CH(CN)]ᵧ–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Acrylonitrile improves chemical and heat resistance over PS while retaining transparency; still relatively brittle.
Applications
Battery housings, kitchenware, cosmetic packaging, mixer bowls.