PEEK CNC Machining Service

Why Choose PEEK

Highest Temperature Resistance of Any Standard Thermoplastic

PEEK maintains mechanical properties up to 250°C continuous — significantly beyond PA66 (120°C), POM (90°C), or PC (130°C). For components in direct contact with steam, high-temperature process fluids, or operating near heat sources, PEEK is the correct thermoplastic choice.
Exceptional Mechanical Strength

Unfilled PEEK has a tensile strength of ~100 MPa and a flexural modulus of ~4 GPa — the strongest of any common thermoplastic. Glass-filled and carbon-filled grades reach 200 MPa and 10+ GPa modulus respectively, entering the territory of aluminum alloys at a fraction of the weight.
Broad Chemical Resistance

PEEK resists most organic solvents, fuels, hydraulic fluids, steam, and many acids and bases at elevated temperature — a chemical resistance profile that approaches PTFE for most practical applications, combined with structural strength that PTFE cannot provide.
Biocompatibility and Radiolucency

PEEK is non-toxic, non-reactive in the body, and radiolucent (does not block X-rays) — making it the standard material for orthopedic spinal implants, bone plates, and dental components. It is compatible with all sterilization methods including autoclave at 134°C.

Common PEEK Grades

Unfilled PEEK

Pure polymer — highest chemical resistance, biocompatibility, and electrical insulation. Standard for medical implants, chemical handling seals, and precision structural parts where filled grades' filler particles would cause issues.

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PEEK+GF30 (30% Glass-Filled)

Glass fiber nearly triples stiffness and reduces thermal expansion to ~20 ppm/°C — for structural PEEK components requiring high rigidity and dimensional stability under load. Slight reduction in chemical resistance and biocompatibility vs. unfilled.

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Our Machining Capability

PEEK is a premium machining material that we handle regularly for medical, aerospace, semiconductor, and oil and gas applications. PEEK machines with similar characteristics to tough aluminum alloys — it requires sharp carbide tooling, adequate coolant, and conservative finishing passes to avoid surface melting and dimensional drift. Tolerances held to ±0.01–0.02 mm on precision features. CMM reports, material certificates, and full inspection records are issued with every batch.
Limitations & Cost Considerations

PEEK is the most expensive common engineering plastic by a significant margin — raw material cost for unfilled PEEK is 20–50× higher than nylon or POM, and machining is more expensive due to slower speeds and higher tooling consumption. PEEK should only be specified when its combination of temperature resistance, mechanical strength, and chemical resistance is genuinely required — for applications that nylon, POM, or even PC can meet, those materials are substantially more economical. PEEK+GF and PEEK+CF grades are abrasive to cutting tools and require dedicated tooling.

FAQ

When does an application genuinely require PEEK vs. a less expensive plastic?

PEEK is necessary when two or more of the following apply simultaneously: (1) service temperature above 150°C, (2) structural load requiring >50 MPa sustained stress, (3) chemical environment that attacks nylon, POM, or PC, (4) biocompatibility or radiolucency required. If only one of these conditions applies, a less expensive material (PA66, POM, or PTFE) likely meets the requirement at far lower cost.
What is the difference between unfilled PEEK and carbon-filled PEEK for structural applications?

Unfilled PEEK has a flexural modulus of ~4 GPa — stiff for a plastic, but modest compared to metals. PEEK+CF30 reaches 10–18 GPa flexural modulus, which approaches aluminum (70 GPa) more closely and is comparable to some CFRP composites in specific loading directions. If rigidity and dimensional stability under load are critical, carbon-filled PEEK is the correct grade. For chemical resistance, biocompatibility, or electrical insulation, unfilled PEEK is required.
What tolerances can you hold on PEEK parts?

±0.01–0.02 mm on precision machined features — better than most engineering plastics due to PEEK's good dimensional stability and low moisture absorption (<0.5%). For medical implant features with tight profile tolerances, ±0.005 mm is achievable on specific dimensions with appropriate process control. We confirm achievable tolerances against your drawing at the quoting stage.