Polyphenylene Sulfide (PPS)
Polyphenylene Sulfide (PPS) - A crystalline polymer having a symmetrical, rigid backbone chain consisting of recurring p-substituted benzene rings and sulfur atoms. A variety of grades suitable for slurry coating, fluidized-bed coating, electrostatic spraying, as well as injection and compression molding are offered. Polyphenylene sulfides exhibit outstanding chemical resistance, thermal stability, dimensionally stability, and fire resistance. PPS's extreme inertness toward organic solvents, and inorganic salts and bases make for outstanding performance as a corrosion-resistant coating suitable for contact with foods.
The first commercial grades of polyphenylene sulfides (PPS) were introduced by Phillips Petroleum in 1968 under the trade name Ryton. These were of two types, a thermoplastic branched polymer of very high viscosity which was processed by PTFE-type processes, and an initially linear polymer which could be compression molded. Then, in 1973 in Europe, the emphasis was shifted to injection molding and coating processes.
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- Difficult to process (high melt temperature)
- Comparatively high cost
- Fillers required to get good impact strength
- Subject to warpage and brittleness