Views: 220 Author: plastic-material Publish Time: 2025-12-05 Origin: Site
PEEK (polyetheretherketone) is used for load-bearing, high-temperature and chemically exposed parts across eight major industries — aerospace structures, semiconductor wafer processing, medical implants and instruments, automotive and EV powertrains, oil and gas sealing systems, chemical processing, food machinery, and robotics — because it combines 260°C continuous service, ~100 MPa tensile strength, near-universal chemical resistance and metal-level wear life in one thermoplastic. It melts at 343°C, carries loads from −60°C cryogenic cold up to 260°C continuous (300°C peaks), and replaces machined stainless steel, titanium and brass parts that corrode, weigh too much or need lubrication. If your part fails in metal by corrosion or weight, or fails in ordinary plastics by heat or creep, PEEK is the default next candidate — the sections below map each industry to the exact parts it runs and the property that makes PEEK the pick.
PRES compounds and machines PEEK across pellets, sheet and rod, so the application notes below reflect what we actually extrude and cut — not just datasheet values. Full property data sits on our PEEK material page.
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● Quick Answer >> Why PEEK Survives These Jobs >> 8 Key Applications at a Glance >> Aerospace and Defense >> Semiconductor and Electronics >> Medical and Healthcare >> Automotive and EV >> Oil, Gas and Chemical Processing >> Food and Beverage >> Robotics and 3D Printing >> Choosing Form and Grade >> FAQ
Metal replacement at temperature — PEEK brackets, clips, seals and bearings run at 200–260°C where nylon, POM and PEAK-class alternatives creep or melt; it cuts part weight by up to ~70% versus the steel part it replaces.
Contamination-critical manufacturing — semiconductor wafer carriers, CMP retaining rings and medical instrument trays rely on PEEK's low particle generation, purity and 1,000+ steam-sterilization endurance (in medical grades).
Chemical and wear duty — pump and compressor seals, valve seats and bushings use PEEK where solvents, acids or sour gas attack metals and elastomers; its wear life at 250°C exceeds nearly every unfilled engineering plastic.
Every application below traces back to the same four properties, so it is worth fixing the numbers before the industry tour. PEEK is semi-crystalline: its 343°C melting point and 143°C glass transition give it a 260°C continuous service rating with short excursions to 300°C, while its ~100 MPa tensile strength and ~4 GPa flexural modulus (unfilled) hold loads that would collapse most plastics at temperature. Chemically, it resists nearly every solvent, salt and weak acid — only concentrated sulfuric acid and a few specialty attacks are documented on our PEEK chemical resistance chart. And it is inherently flame retardant (UL 94 V-0 without additives) with low smoke and low toxicity emission, which is what unlocks aerospace interiors.
| Property | Typical value (unfilled) | Test standard |
|---|---|---|
| Melting point | 343°C | ISO 11357 |
| Glass transition (Tg) | 143°C | ISO 11357 |
| Continuous service temperature | 260°C (peak 300°C) | UL 746B |
| Tensile strength | ~100 MPa | ISO 527 |
| Flexural modulus | ~4 GPa | ISO 178 |
| Flammability | UL 94 V-0 (inherent) | UL 94 |
PRES typical values for unfilled natural PEEK — grade-specific data governs; glass- and carbon-filled grades move most numbers upward.
| Industry | Typical PEEK parts | Property that wins the job | Typical requirement |
|---|---|---|---|
| Aerospace and defense | Brackets, clips, ducting, cable ties, tubing | FST (V-0, low smoke) + weight | −60°C to 200°C, flame-smoke-toxicity certs |
| Semiconductor | Wafer carriers, CMP rings, test sockets | Purity, low particles, dimensional stability | 150–280°C process steps |
| Medical | Instrument trays, implant-grade components, sterilization cases | Steam-sterilization endurance, biocompatibility | ISO 10993, 134°C autoclave |
| Automotive and EV | Seals, thrust washers, EV connector and battery parts | Heat + dielectric strength + weight | 150–200°C continuous under hood |
| Oil and gas | Backup rings, valve seats, compressor valve plates | HPHT strength, sour gas resistance | 200°C+, high pressure |
| Chemical processing | Pump housings, impellers, labyrinth seals | Near-universal chemical resistance | Wet chemistry, 100–200°C |
| Food and beverage | Conveyor wear strips, bearings, filling machine parts | Food-contact grades + washdown endurance | FDA / EU 10/2011 compliance |
| Robotics and 3D printing | Gears, robot arm components, UAV blades, printing filament | Wear life + stiffness-to-weight | Millions of duty cycles |
Part examples reflect common industry practice and PRES machining references; each application's final grade choice depends on the certification and load case.
Aerospace was PEEK's first mass adoption and remains the reference case for metal replacement: interior brackets, ducting, fastener clips, cable ties and hydraulic tubing replace aluminum and titanium at roughly a third of the weight, while the inherent UL 94 V-0 rating with low smoke and low toxicity passes the FST certification that disqualifies most plastics outright. The temperature window matters as much as the weight: PEEK parts hold properties from −60°C at altitude to 200°C near engine zones, which is why tube and ducting for bleed-air adjacent systems specify it. Grade selection typically moves to carbon- or glass-filled compounds when stiffness, not just strength, is the binding requirement.
In wafer fabrication, PEEK's job is to touch silicon without contaminating it: wafer carriers, CMP (chemical-mechanical polishing) retaining rings, test sockets and insulating hardware are made from high-purity PEEK because it generates almost no particles, outgasses little, and holds dimension through the 150–280°C process steps that soften lesser plastics. Its dielectric strength makes it a natural insulator in test fixtures, and static-control lines of the same polymer serve ESD-sensitive assembly — the property split between conductive and insulating PEEK is explained in our is PEEK ESD guide.
PEEK serves medicine at two extremes. On the instrument side, sterilization trays, surgical tool handles and dental components survive thousands of 134°C autoclave cycles without the hydrolysis cracking that plagues other transparent plastics — biocompatible grades carry ISO 10993 certification. On the implant side, spinal cages and other implant-grade components use PEEK because its elastic modulus is close to cortical bone (reducing stress shielding), it is radiolucent under imaging, and it is inert in the body. Both duties trace to the same backbone chemistry that makes the polymer tough in steam — the reason medical-grade PEEK commands its price premium.
Combustion powertrains use PEEK where 150–200°C continuous heat and long wear life meet: seals, thrust washers, piston component coatings, transmission sensor rings and bushings that would need grease and frequent service in metal. Electric vehicles shift the duty toward voltage and electronics: PEEK films and molded parts insulate battery cell frames, HV connectors, e-motor slot insulation and charging hardware, combining dielectric strength with flame retardance and the dimensional stability needed at connector tolerances. In both cases the economics repeat the aerospace pattern — a more expensive material replacing a cheaper one, justified by eliminated lubrication, longer service and weight.
Downhole and surface equipment put every failure mode together — high pressure, 200°C+ temperature, sour gas and corrosive media — and PEEK backup rings, valve seats, compressor valve plates and pump wear parts are the standard answer where elastomers extrude and metals corrode. The chemical-processing industry makes the same trade above ground: pump housings, impellers and labyrinth seals run in wet chemistry that would eat stainless steel, relying on PEEK's resistance to acids, bases and solvents documented across our chemical resistance chart. Where seals must slide against metal at pressure, PEEK is frequently paired against PTFE — the division of labor between the two is compared in our PEEK vs PTFE guide.
Food machinery needs plastics that are simultaneously food-contact compliant, wear-resistant and tolerant of daily caustic washdown — PEEK bearings, conveyor wear strips, filling and packaging machine parts and scraper blades deliver all three. Food-contact grades comply with FDA and EU 10/2011; the material's low moisture uptake keeps dimensions stable through steam and hot-water cleaning cycles where nylon swells; and its dry-running capability eliminates grease that could contact product. Baking and filling lines at 150°C+ continuous ambient are the classic adoption point.
The newest volume growth comes from motion and additive manufacturing. In robotics, PEEK gears, harmonic drive components and robot arm structures exploit its wear life and stiffness-to-weight ratio — our humanoid robot PEEK applications guide details part-level choices, and the wear behavior behind gear life is compared grade-by-grade in our bearing-grade vs CF30 comparison. Carbon-fiber-filled PEEK (CF30) additionally serves UAV structural blades where vibration and fatigue rule out unfilled grades. In 3D printing, PEEK filament prints into end-use brackets, jigs and small-series parts that previously required machining — economical exactly at the volumes between prototyping and injection molding.
The application determines the form. For injection molding at volume, PEEK pellets in unfilled, glass-filled (GF30) and carbon-filled (CF30) compounds cover the duty range above. For machining small series and prototypes, stock is held in PEEK sheet and PEEK rods with CNC cutting service. Grade logic in one line: unfilled for toughness and purity, GF30 for stiffness at lower cost, CF30 for maximum stiffness and wear, bearing grades for dry-running contact. The full decision table sits in our PEEK material selection guide.
Q1: What is PEEK material used for in simple terms?
A: In short — parts that are too hot, too corrosive or too heavily loaded for normal plastics, and too corrosive-prone or heavy for metal: aerospace brackets, semiconductor wafer carriers, medical instrument trays, automotive seals, oilfield valve parts, food machinery bearings and robot gears are the headline uses.
Q2: What temperature can PEEK parts handle in service?
A: Unfilled PEEK is rated for 260°C continuous service with short-term peaks to 300°C, and it holds useful mechanical properties from −60°C upward. At the 150–200°C level where most under-hood and process applications live, PEEK retains the majority of its room-temperature strength.
Q3: Is PEEK used inside the human body?
A: Yes — implant-grade PEEK is used in spinal cages and other long-term implants because its stiffness is close to cortical bone, it is radiolucent under X-ray and MRI, and it is biologically inert. Instrument-side uses (trays, tool handles) rely on biocompatible grades certified to ISO 10993.
Q4: Why use PEEK instead of metal?
A: Three economic reasons: weight (roughly a third of the replaced metal part), corrosion immunity (no plating or coating needed in aggressive media), and self-lubrication (no grease in food, vacuum or cleanroom duty). PEEK also machines into geometries that would need expensive metal fabrication.
Q5: What chemicals can PEEK not withstand?
A: The documented exceptions are short: concentrated sulfuric acid, nitric acid at high concentration, and a handful of halogenated specialty environments at elevated temperature. Against nearly all solvents, salts, weak acids and bases it is effectively inert — see the resistance chart linked above for the full table.
Q6: Which industries use the most PEEK?
A: By volume, semiconductor equipment, automotive/EV, aerospace and medical lead consumption; oil and gas and chemical processing are smaller by tonnage but use the highest-filled, highest-spec grades; robotics and 3D printing are the fastest-growing segments.
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