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Construction Materials-Other Building Materials
Polyphenylene Sulfide (PPS)
PPS Main Properties
◆ [Excellent heat resistance] The melting point exceeds 280°C, and the heat distortion temperature exceeds 260°C, with long-term use temperatures between 220-240°C. It degrades in air at 700°C and retains 40% of its weight in inert gas at 1000°C. Both short-term heat resistance and long-term thermal stability during continuous use exceed that of all current engineering plastics. Specially modified varieties can reach heat distortion temperatures of over 350°C.
◆ [Inherently flame retardant] Polyphenylene sulfide can achieve UL94-0 flame retardant rating, with an oxygen index (LOI) > 57%. The chemical structure of polyphenylene sulfide provides excellent flame resistance without the need for added flame retardants.
◆ [Good mechanical properties] It has high rigidity, high surface hardness (Rockwell hardness > 100HR), tensile strength > 170MPa, flexural strength > 220MPa, notched impact strength > 16MPa, and flexural modulus > 3.5×10^4. It also exhibits excellent creep resistance and fatigue resistance.
◆ [Excellent chemical resistance] No solvent has been found to dissolve polyphenylene sulfide below 200°C, and it exhibits strong resistance to inorganic acids, bases, and salts.
◆ [Good dimensional stability] The molding shrinkage rate is very low, less than 0.0025%, with an absorption rate of less than 0.05%, and a small linear thermal expansion coefficient. It maintains good dimensional stability even under high temperature and high humidity conditions. Therefore, it has a wide range of applications in machinery, chemical industry, instruments, aerospace, and shipbuilding, among others.
◆ [Good electrical performance] Polyphenylene sulfide retains excellent electrical performance 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 reaches a radiation resistance of Gy1×10^8, making it a new material unmatched by other engineering plastics, ideal for fields such as electronics, electrical engineering, machinery, instruments, aerospace, and military, particularly for radiation-resistant applications.
◆ [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. Glass fiber or inorganic filler-reinforced injection-grade granules made from it have high resistance to shrinkage, impact, bending, and ductility. It can be uniformly formed above its melting point.
◆ [Good bonding performance with metals and non-metals] PPS has very high bonding strength to materials such as glass, aluminum, titanium, and stainless steel, achieving a level 1 adhesion. Its bonding performance with glass is excellent, making it very suitable for lining chemical equipment.
PPS Main Applications
Electrical and Electronics: Packaging for microelectronic components, connectors, terminals, sockets, coil frames, trimmer capacitors, and fuse bases.
Mechanical Instruments: Pump housings, impellers, bearings, gears, pulleys, universal joints, seals, flanges, counters, leveling instruments, and flow meter components.
Automotive Field: Temperature sensors, evaporators, vapor pumps, seat bases, and water tank chambers.
Household Appliances: Electric fans, microwave oven brackets, dryers, coffee makers, rice cookers, hot air dryers, hair curlers, and air conditioner compressors.
Military Field: Used in the production of fighter jets, vertical tail fins, combustion chambers, and various components for aerospace, aircraft connectors, coil frames, and instrument panels, particularly in major components of stealth fighters and bombers. Parts resistant to nuclear radiation for submarines, supports, helmets, military tents, utensils, astronaut supplies, and corrosion-resistant and wear-resistant components for warships and submarines. New combat vehicles developed by the United States (currently in production) and plastic tanks developed by the United Kingdom (in experimental stage), etc.
Fibers and Films: PPS fibers blended with other synthetic fibers can be used to produce high-performance industrial filter fabrics and radiation-resistant fabrics for aerospace. PPS films are excellent insulation materials achieving F class, suitable for capacitors, impedance electronic components, flat coil frames, wire coatings, covers, vaporizer membranes, thermosensitive printing materials, soft magnetic disks, and photosensitive belts for electronic photography.
