Overview
Self-lubricating PPS is a modified form of polyphenylene sulfide, enhanced with additives like PTFE or graphite to reduce friction. It retains PPS's inherent strengths—high temperature resistance (up to 220°C continuous use), flame retardancy, and dimensional stability—while addressing wear challenges in dynamic applications. This material is particularly valuable in environments where external lubricants are impractical, such as in food processing or cleanroom equipment. Its versatility spans industries from automotive (e.g., fuel system components) to industrial machinery (e.g., pump parts).
Physical and Chemical Properties
The material exhibits a low coefficient of friction (0.1–0.3), comparable to oil-impregnated metals, while maintaining PPS's chemical inertness to fuels, acids, and alkalis. Its tensile strength ranges from 50–80 MPa, with a UL94 V-0 flame rating. Thermal properties include a heat deflection temperature of 260°C at 1.82 MPa. The self-lubricating variants show 50–70% less wear than standard PPS in ASTM D3702 thrust washer tests, with minimal creep under load.
Main Applications
In automotive systems, it's used for throttle body bearings and transmission components, reducing noise and maintenance. Aerospace applications include actuator gears and satellite mechanisms, where outgassing is a concern. Industrial uses dominate, such as conveyor system guides in food packaging or chemical pump seals. Electrical applications benefit from its dielectric properties in connectors and sensor housings, often replacing thermosets.
Safety and Storage
While PPS is inherently stable, additives may affect processing safety. Dust generated during machining requires HEPA filtration. Storage should avoid humidity above 50% to prevent moisture absorption (typically <0.05% w/w). Disposal follows thermoplastic recycling guidelines, though additive separation may be needed. Incineration should only occur in controlled facilities due to potential sulfur oxide emissions.
B2B Procurement Guide
Key specifications to request include: filler type (PTFE typically offers better lubrication, graphite higher load capacity), filler percentage (usually 5–20%), and FDA/EC compliance if needed for food contact. Suppliers should provide test data on PV (pressure-velocity) limits—high-performance grades withstand over 20,000 psi·ft/min. Consider custom compounding for extreme environments, such as sub-zero or high-radiation conditions.
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