PS-Modified Polyphenylene Oxide PPO

PPO is a tough rigid polymer with good dimensional stability when subjected to high temperatures and humidities. However, because it is reputedly difficult to process it may be blended to facilitate injection moulding. It is sometimes seen as a substiute for metal diecastings. 

PS-modified polyphenylene oxide is produced by GE plastics and marketed under the trade name Noryl. Applications include UL 94 V-0 flame retardant [3] PCB enclosures and glass-fibre filled self-extinguishing UL 94 V-1 relay bases. The latter application permits 600 V operation with an operating temperature of 110 °C and a short-term tolerance of 135 °C. 

---