PPO / PPE
Poly(phenylene oxide)
Glass Transition (Tg)
210–215 °C
Melting Point (Tm)
— (amorphous)
Density
1.06 g/cm³
CAS Number
25134-01-4
Recycling Code
♺ 7
Category
Engineering
Repeat Unit
–[O–C₆H₂(CH₃)₂]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
Very high Tg but extremely difficult to process alone; almost always blended with PS (Noryl), which is fully miscible with it — a classic textbook miscible blend.
Applications
Noryl blends for electrical housings, water pumps, fuel-cell plates.