PPS
Polyphenylene Sulfide
Glass Transition (Tg)
85–90 °C
Melting Point (Tm)
280–285 °C
Density
1.35 g/cm³
CAS Number
25212-74-6
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[C₆H₄–S]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
Semi-crystalline; virtually no solvent dissolves it below 200 °C; inherently flame retardant (LOI ~44 %); very low mould shrinkage; brittle unless glass-filled.
Applications
Pump housings, automotive under-hood parts, electrical connectors, coatings.