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PRES
PEEK gaskets are manufactured from polyetheretherketone, a high-performance engineering thermoplastic designed for sealing under high temperature, high pressure, aggressive chemicals, and continuous mechanical load.
Compared with soft plastics such as PTFE, PEEK offers much higher tensile and compressive strength, excellent creep resistance, and stable dimensions in demanding flange, valve, pump, and instrumentation applications.
High temperature resistance: continuous service around −60 to 260°C for virgin PEEK; short-term peaks up to 300°C depending on grade and load. Melting point about 343°C, glass transition about 143°C.
High mechanical strength: virgin PEEK tensile strength typically 100 MPa; far higher rigidity and load-bearing capacity than PTFE, with low creep under bolt load.
Creep and cold-flow resistance: maintains shape under sustained compression, suitable for high-pressure flanges, valve bonnets, and static seals where soft PTFE may cold-flow.
Chemical resistance: resistant to many acids, alkalis, solvents, oils, fuels, steam, and hot water; excellent hydrolysis resistance. Avoid or verify concentrated nitric/sulfuric acid at high temperature and certain halogenated solvents.
Wear and friction options: virgin PEEK has good wear resistance; carbon-filled PEEK improves wear life, lowers friction in selected conditions, and increases stiffness for dynamic or semi-dynamic service.
Dimensional stability: low moisture absorption, low thermal expansion versus standard plastics, tight CNC tolerances for precision assemblies.
Flame behavior: inherently flame-retardant, typically UL 94 V-0 for qualified PEEK grades.
Clean and specialty grades: food-contact, medical, semiconductor, and antistatic/conductive options available subject to grade and certification.
| Property | Value | Test note |
|---|---|---|
| Density | 1.30g/cm³ | ISO 1183 |
| Tensile strength | 100 MPa | ISO 527 |
| Flexural modulus | ~3.6–4.1 GPa | ISO 178 |
| Compressive strength | ~110–125 MPa | ISO 604 |
| Elongation at break | 45% | ISO 527 |
| Water absorption, 24h | 0.07% | ISO 62 |
| Coefficient of linear thermal expansion(below Tg) | 45ppm/K | ISO 11359 |
| Chemical resistance | Very good to most acids/alkalis/solvents/steam | Verify strong oxidizers |
Standard forms: inner diameter × outer diameter × thickness rings, full-face gaskets, spacer/insulating gaskets, washer-type gaskets.
Materials: virgin PEEK, PEEK-GF30, PEEK-CF30, PEEK-HT/high-heat grades, specialty compounds.
Processing: CNC turning/milling from rod or plate, precision stamping for thin shapes, injection molding for volume profiles.
Tolerance: standard ±0.05–0.10 mm; tighter tolerance available by CNC and inspection request.
Drawing formats: PDF, DWG, STEP, IGES.
Color: natural/beige, black, or per compound.
Surface: as-machined, deburred, cleanroom-washed for semiconductor/medical.
Chemical and petrochemical pumps, valves, reactors, and piping flanges
Oil and gas downhole tools, surface valves, manifolds, and high-pressure seals
Semiconductor wet benches, ultrapure water, and wafer-handling components
Pharmaceutical and food processing equipment where certified grades apply
Aerospace hydraulic systems, fuel systems, and high-temperature static seals
Medical devices, sterilizable components, and laboratory instrumentation
Power generation, steam systems, and nuclear-support components where specified
Automotive turbo, transmission, and sensor sealing under heat/load
Grade selection support: virgin, GF30, CF30
Tight-tolerance CNC machining from certified PEEK stock.
Chemical compatibility review based on your media list.
Sample service 3–7 days for standard custom parts; batch inspection reports available.
ISO-quality control, full-size inspection, CMM available for critical parts.
Lower total cost versus frequent gasket replacement in high-load/high-temperature service.
