PES
Polyethersulfone
Glass Transition (Tg)
220–225 °C
Melting Point (Tm)
— (amorphous)
Density
1.37 g/cm³
CAS Number
25667-42-9
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[O–C₆H₄–SO₂–C₆H₄]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
Higher Tg than PSU with excellent creep resistance and hydrolytic stability; strongly hydrophilic surface makes it ideal for filtration membranes.
Applications
Ultrafiltration membranes, aircraft parts, medical instruments.