Maybe JeffreyHo can provide more details of his design. So it's hard to say which material - PTFE or PEEK - might be a better choice for this particular situation. The OP seemed to imply that the material was intended for some type of sealing application, but did not provide any details. This rigid opaque material offers a unique combination of mechanical properties, resistance to chemicals, wear, fatigue and creep, as well as exceptionally high. The one major limitation of using unfilled PTFE for pressure sealing is that it has a tendency to cold-flow when exposed to sustained pressure over long periods of time. One especially nice thing about a PTFE seal running against a metal surface is that over time a layer of PTFE is transferred to the metal surface, which results in a PTFE-on-PTFE contact with very low friction and leakage. The effect of higher stress or temperature. PEEK materials, making them ideal for metal replacement. These components cannot be constructed from any plastic on the shelf. Creep behavior of HP40Nb micro-alloyed steel was examined at temperatures ranging from 923 K to 1323 K and stress levels in the range 47 MPa to 120 MPa. These RTP 2200 Series PEEK Long Fiber Compounds significantly improve impact strength when compared to. But for a high-volume, low-cost product application I could see where it might be an issue.įor a dynamic seal application, where pressures are not too high, PTFE might be a good choice since it has excellent friction and conformability characteristics. Bushings or bearings for shaft stabilization. For high-performance seal applications the raw material cost difference should not be a major concern. PEEK is usually more expensive than PTFE on a $/lb raw material cost basis, but most seal applications would require modest amounts of material if molding is used to fabricate the seal element. Both materials can be fabricated by machining or molding. PTFE has excellent low/high temperature capability, low friction properties, and is chemically inert. PFA has a higher creep resistance but PTFE can withstand a higher degree of multiple folding. In fact, they differ significantly only with regard to cold flow (PFA better than PTFE) and folding endurance (PTF E better than PFA). PEEK has excellent mechanical strength, high temperature capability, chemical compatibility, and wear resistance. Even in critical melting point (service temperature) ratings, both materials have identical properties. Moltenmetal is correct, neither PEEK or (solid) PTFE are elastomers, they are thermoplastic polymers.
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