Polyphenylene Sulfide (PPS)
PPS Main Properties
◆[Excellent Heat Resistance] Its melting point exceeds 280℃, heat distortion temperature exceeds 260℃, and long-term usage temperature is between 220-240℃. It degrades in air at 700℃ and retains 40% of its weight in inert gas at 1000℃. Both short-term heat resistance and long-term thermal stability during continuous use are superior to all currently available engineering plastics. Specially modified varieties can reach a heat distortion temperature above 350℃.
◆[Inherent Flame Retardancy] The flame retardancy of polyphenylene sulfide can reach UL94-0 level, with an oxygen index (LOI) >57%. The chemical structure of polyphenylene sulfide provides good flame-resistant properties without the need for added flame retardants.
◆[Good Mechanical Properties] It has very high rigidity, surface hardness greater than 100HR, tensile strength greater than 170MPa, flexural strength greater than 220MPa, notched impact strength greater than 16MPa, and flexural modulus greater than 3.5×104, along with excellent creep resistance and fatigue resistance.
◆[Excellent Chemical Resistance] Currently, no solvents have been found to dissolve polyphenylene sulfide below 200℃, and it has very strong resistance to inorganic acids, bases, and salts.
◆[Good Dimensional Stability] It has a very low molding shrinkage rate of less than 0.0025%, an absorption rate of less than 0.05%, and a small linear thermal expansion coefficient. It demonstrates good dimensional stability even under high temperature and high humidity conditions. Therefore, it has wide applications in machinery, chemical industry, instruments, aviation, aerospace, and shipping.
◆[Good Electrical Properties] Polyphenylene sulfide 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 greater than 18KV/mm.
◆[Radiation Resistance] It has a radiation resistance of Gy1×108, making it an unmatched new material compared to other engineering plastics. It is an ideal material for fields such as electronics, electrical engineering, machinery, instruments, aviation, aerospace, and military applications, especially for radiation-resistant uses.
◆[Good Processing Performance] PPS resin has low melt viscosity and good flowability, making it easy to wet and contact with glass fibers. Therefore, it is easy to fill with fillers. The glass fiber or inorganic filler reinforced injection molding-grade pellets made from it exhibit extremely high resistance to stretching, impact, bending, and ductility. It can be uniformly molded above its melting point.
◆[Good Adhesion with Metals and Nonmetals] PPS has very high bonding strength, particularly with glass, aluminum, titanium, and stainless steel, achieving a level 1 adhesion. Its adhesion performance with glass is particularly good, making it very suitable as a lining for chemical equipment.
Main Application Areas of PPS
Electronics and Electrical: Packaging for microelectronic components, connectors, wiring devices, sockets, coil frames, trimmer capacitors, fuse bases.
Mechanical Instruments: Pump housings, impellers, bearings, gears, pulleys, universal joints, sealing gaskets, flanges, counters, leveling instruments, and flow meter components.
Automotive Field: Temperature sensors, evaporators, vaporization pumps, seat bases, water tank chambers.
Home Appliances: Electric fans, microwave oven brackets, dryers, coffee makers, rice cookers, hot air tools, curling irons, air conditioning compressors.
Military Field: Components for fighter jets, vertical tail fins, combustion chambers, connectors for aviation, aerospace, and flying vehicles, coil frames, instrument panels, especially for key components of stealth fighters and bombers. Parts for nuclear submarines that resist nuclear radiation, support helmets, military tents, containers, astronaut supplies, corrosion-resistant and wear-resistant components for warships and submarines, new type of combat vehicles developed by the U.S. (currently in production) and plastic tanks developed by the U.K. (currently in testing), etc.
Fibers and Films: High-performance industrial filter cloths and radiation-resistant aerospace fabrics can be made by blending PPS fibers with other synthetic fibers. PPS films are excellent insulation materials reaching F-class, suitable for making capacitors, impedance electronic components, flat coil frames, wire coatings, coverings, evaporator membranes, thermal printing materials, flexible disks, and light-sensitive strips for electronic photography.
