COC / COP
Cyclic Olefin Copolymer
Glass Transition (Tg)
70–180 °C
Melting Point (Tm)
— (amorphous)
Density
1.02 g/cm³
CAS Number
26007-43-2
Recycling Code
♺ 7
Category
Engineering
Repeat Unit
–[CH₂–CH₂]ₓ–[C₇H₁₀ (norbornene)]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
Amorphous, glass-clear with extremely low water absorption and excellent moisture barrier; Tg tunable by comonomer ratio; high purity and low protein binding.
Applications
Prefilled syringes, diagnostic cuvettes, blister packaging, optical lenses.