Polysulfide Ether (English name: Polyphenylene Sulfide)
Abbreviation: PPS
Main Properties of PPS
◆[Excellent Heat Resistance] Its melting point exceeds 280℃, heat distortion temperature exceeds 260℃, and long-term use temperature is 220-240℃. It degrades at 700℃ in air and retains 40% of its weight at 1000℃ in inert gas. Both short-term heat resistance and long-term thermal stability are superior to all current engineering plastics. Specially modified varieties can achieve a heat distortion temperature of over 350℃.
◆[Inherent Flame Retardancy] Polysulfide Ether can reach UL94-0 level flame retardancy, with an oxygen index (LOI) > 57%. The chemical structure of polysulfide ether provides excellent flame resistance without the need for added flame retardants.
◆[Good Mechanical Properties] It has strong rigidity, high surface hardness, Rockwell hardness > 100HR, tensile strength > 170MPa, flexural strength > 220MPa, notched impact strength > 16MPa, flexural modulus > 3.5×10^4, and exhibits excellent creep resistance and fatigue resistance.
◆[Excellent Chemical Resistance] No solvents that can dissolve polysulfide ether at temperatures below 200℃ have been found, and it has strong resistance to inorganic acids, bases, and salts.
◆[Good Dimensional Stability] The molding shrinkage rate is very low, less than 0.0025%, and the absorption rate is less than 0.05%, with a low linear thermal expansion coefficient. It demonstrates good dimensional stability even under high temperature and high humidity conditions. Therefore, it has a wide range of applications in machinery, chemical industry, instrumentation, aviation, aerospace, shipping, and other fields.
◆[Superior Electrical Properties] Polysulfide ether maintains excellent electrical properties under high temperature, high humidity, and high frequency conditions, with a volume resistivity of 1×10^16Ω.cm, surface resistivity of 1×10^15Ω, and electrical strength > 18KV/mm.
◆[Radiation Resistance] It has radiation resistance reaching Gy1×10^8, which is unmatched by other engineering plastics. It is an ideal material for electronics, electrical appliances, machinery, instrumentation, aviation, aerospace, military applications, particularly in radiation-resistant contexts.
◆[Good Processing Performance] PPS resin has low melt viscosity and good fluidity, 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 granules made from it exhibit extremely high resistance to shrinkage, impact, bending, and ductility. It can be uniformly formed above its melting point.
◆[Good Adhesion with Metals and Non-metals] PPS exhibits very high bonding strength with materials such as glass, aluminum, titanium, and stainless steel, achieving level 1 adhesion. Its bonding performance with glass is particularly good, making it suitable for lining chemical equipment.
Main Applications of PPS
Electronics and Electrical: Microelectronic component packaging, connectors, wiring devices, sockets, coil frames, trimmer capacitors, fuse bases.
Mechanical Instruments: Pump housings, pump impellers, bearings, gears, pulleys, universal joints, seals, flanges, counters, leveling instruments, flow meter components.
Automotive Sector: Temperature sensors, vaporizers, evaporators, vapor pumps, seat bases, water tank compartments.
Home Appliances: Electric fan, microwave bracket, dryer, coffee maker, rice cooker, hot air blower, hair curler, air conditioning compressor.
Military Applications: Used in the production of fighter jets, vertical tail fins, combustion chambers, aviation, aerospace, aircraft connectors, coil frames, instrument panels, especially for main components of stealth fighters and bombers. Parts of nuclear submarines resistant to nuclear radiation, supports, helmets, military tents, utensils, astronaut supplies, corrosion-resistant and wear-resistant parts for warships and submarines, new battle vehicles developed by the USA (currently in production) and plastic tanks developed by the UK (in experimental phase), etc.
Fibers and Films: PPS fibers blended with other synthetic fibers can be made into high-performance industrial filter cloth and radiation-resistant aerospace fabric. PPS film is an excellent insulation material reaching F grade, suitable for making capacitors, impedance electronic components, flat coil frames, wire coatings, covers, vaporizer diaphragms, thermosensitive printing materials, flexible disks, and photosensitive tapes for electronic photography, etc.
