PPSU
Polyphenylsulfone
Glass Transition (Tg)
~220 °C
Melting Point (Tm)
— (amorphous)
Density
1.29 g/cm³
CAS Number
25608-64-4
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[O–C₆H₄–C₆H₄–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
Best-in-class among sulfones for impact and steam-sterilisation resistance — survives 1000+ autoclave cycles without embrittlement.
Applications
Reusable surgical instrument trays, baby bottles, aircraft interiors, plumbing.