Polyphenylene Sulfide (PPS)
Abbreviation PPS 
Main performance of PPS
◆ [Excellent heat resistance] Its melting point exceeds 280℃, heat distortion temperature exceeds 260℃, long-term use temperature is 220-240℃. It degrades at 700℃ in air and still retains 40% of its weight in inert gas at 1000℃. Both short-term heat resistance and long-term continuous use thermal stability are better than all current engineering plastics. With special modification, the heat distortion temperature can exceed 350℃.
◆ [Inherent flame retardancy] PPS flame retardancy can reach UL94-0 grade, oxygen index (LOI) >57%. The chemical structure of PPS gives it good flame retardancy without the need for flame retardants.
◆ [Good mechanical properties] It is extremely rigid, with high surface hardness, Rockwell hardness >100HR, tensile strength >170MPa, bending strength >220MPa, notched impact strength >16MPa, flexural modulus >3.5×104, and excellent creep resistance and fatigue resistance.
◆ [Excellent chemical resistance] No solvent has been found that can dissolve PPS below 200℃, and it has strong resistance to inorganic acids, alkalis, and salts.
◆ [Good dimensional stability] Low molding shrinkage, less than 0.0025%, absorption rate less than 0.05%, and low linear thermal expansion coefficient. It exhibits good dimensional stability under high temperature and high humidity conditions. Therefore, it is widely used in various fields such as mechanical, chemical, instrumentation, and aviation, aerospace, and shipbuilding.
◆ [Good electrical properties] PPS maintains excellent electrical properties under high temperature, high humidity, and high frequency conditions, with a volume resistivity of 1×1016Ω.cm, surface resistivity of 1×1015Ω, and dielectric strength >18KV/mm.
◆ [Radiation resistance] Radiation resistance reaches Gy1×108, making it a new material that other engineering plastics cannot match. It is an ideal material for electronics, electrical, mechanical, instrumentation, aerospace, aviation, military, and other fields, especially radiation-resistant materials.
◆ [Good processability] PPS resin has low melt viscosity, good flowability, and is extremely wettable to glass fibers, making it easy to fill with fillers. Glass fiber or inorganic filler-reinforced injection molding grade pellets prepared from PPS have extremely high resistance to stretching, impact resistance, bending resistance, and ductility. It can be uniformly shaped above its melting point.
◆ [Good adhesion to metals and non-metals] PPS has particularly high bond strength to glass, aluminum, titanium, stainless steel, and other materials, with adhesion reaching grade 1. It has good bonding performance to glass and is suitable for use as lining material in chemical equipment.
Main applications of PPS
Electronics and electrical: microelectronic component packaging, connectors, terminals, sockets, coil frames, trimmer capacitors, fuse bases.
Mechanical instruments: pump housings, impellers, tiles, gears, pulleys, universal joints, sealing gaskets, flanges, counters, levels, flow meter components.
Automotive field: temperature sensors, carburetors, evolvers, carburetor pumps, seat bases, radiator water chambers.
Household appliances: electric fans, microwave oven brackets, dryers, coffee pots, rice cookers, hot air blowers, hair straighteners, air conditioner compressors.
Military field: making fighter jets, vertical tail wings, combustion chambers, aviation, aerospace, aircraft connectors, coil frames, dashboard components, especially main components of stealth fighters, bombers. Some parts of nuclear submarine radiation-resistant parts, supports, helmets, military tents, containers, astronaut supplies, warships, submarines corrosion-resistant, wear-resistant parts, new tanks developed by the United States (in production stage) and plastic tanks developed by the United Kingdom (in experimental stage), etc...
Fibers, films: PPS fibers blended with other synthetic fibers can be used to make high-performance industrial filter fabrics, radiation-resistant aerospace fabrics. PPS film is a good F-grade insulation material that can be used to make capacitors, impedance electronic components, flat coil frames, wire coatings, covers, carburetor diaphragms, thermosensitive printing materials, flexible disks, photosensitive tapes for electronic photography, etc.
