PSU
Polysulfone
Glass Transition (Tg)
185–190 °C
Melting Point (Tm)
— (amorphous)
Density
1.24 g/cm³
CAS Number
25135-51-7
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[O–C₆H₄–SO₂–C₆H₄–O–C₆H₄–C(CH₃)₂–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
Transparent amber; withstands repeated steam autoclaving; excellent hydrolytic stability; the workhorse of membrane technology.
Applications
Haemodialysis membranes, water-filtration modules, medical trays.