PC
Polycarbonate
Glass Transition (Tg)
145–150 °C
Melting Point (Tm)
— (amorphous)
Density
1.20–1.22 g/cm³
CAS Number
25037-45-0
Recycling Code
♺ 7
Category
Engineering
Repeat Unit
–[O–C₆H₄–C(CH₃)₂–C₆H₄–O–CO]ₙ–
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
Exceptional impact strength (ductile at room temperature), transparent, high heat resistance; notch-sensitive and attacked by many solvents.
Applications
Safety helmets, bullet-resistant glazing, headlamp lenses, electronic housings.