Polyether Ether Ketone[3]

Updated: 2026-09-20

Overview

PEEK resin is a semi-crystalline, high-performance thermoplastic belonging to the polyaryletherketone (PAEK) family. Developed in the 1970s, it combines exceptional thermal stability (continuous use up to 250°C) with robust mechanical properties, making it a preferred material for extreme environments. Its molecular structure—aromatic rings linked by ether and ketone groups—confers rigidity and chemical inertness. PEEK is FDA-compliant and sterilizable, enabling use in food processing and medical devices. Industries value PEEK for its lightweight yet metal-like durability, often substituting titanium or stainless steel. It is processed via injection molding, extrusion, or CNC machining. Leading manufacturers include Victrex (UK), Solvay (Belgium), and Evonik (Germany), with global demand driven by aerospace and healthcare sectors.

Physical and Chemical Properties

PEEK exhibits a glass transition temperature (Tg) of 143°C and a melting point of 343°C, maintaining tensile strength up to 90 MPa even at 200°C. Its thermal degradation begins around 575°C in inert atmospheres. The material’s crystallinity (typically 30-35%) enhances creep resistance and dimensional stability under load. Chemically, PEEK resists hydrolysis, organic solvents, and weak acids/bases but may degrade in concentrated sulfuric acid or halogenated hydrocarbons. It has a UL94 V-0 flammability rating with low smoke emission. Electrical properties include a dielectric strength of 190 kV/mm and volume resistivity of 4.9×10¹⁶ Ω·cm, suitable for insulating components.

Main Applications

In aerospace, PEEK replaces aluminum in brackets, bushings, and wire insulation due to its 70% weight reduction and fuel efficiency benefits. The Airbus A350 and Boeing 787 use PEEK composites for cabin and engine components. Medical applications include spinal fusion cages, dental instruments, and reusable surgical tools, leveraging its biocompatibility (ISO 10993 certified) and autoclave stability. Industrial uses encompass pump seals, bearing cages, and semiconductor wafer carriers, where PEEK’s low particulate generation and ultra-high vacuum compatibility are critical. Automotive manufacturers employ it for transmission parts and turbocharger components to withstand high temperatures and friction.

Safety and Storage

PEEK resin is non-hazardous under normal conditions but requires precautions during high-temperature processing (>300°C), which may release trace phenol vapors. Adequate ventilation and fume extraction are recommended. Workers handling powder forms should use NIOSH-approved N95 masks to prevent respiratory irritation. Storage mandates moisture control (<0.1% humidity) to prevent hydrolysis during melt processing. Original packaging should remain sealed until use, with pellets stored in airtight containers. Shelf life exceeds 5 years if kept dry and below 30°C. Disposal follows general polymer waste regulations, though recycling via regrinding is feasible for uncontaminated scrap.

B2B Procurement Guide

Buyers should specify requirements: unfilled (virgin) vs. reinforced grades (e.g., 30% carbon fiber for higher stiffness), FDA/EU compliance for food/medical use, and colorants if needed. Technical datasheets must include ASTM/ISO test results for tensile strength, HDT (heat deflection temperature), and elongation at break. Order lead times vary from 4-12 weeks for specialty grades. Bulk purchases (500+ kg) often secure 10-15% discounts. Audit suppliers for IATF 16949 (automotive) or AS9100 (aerospace) certifications. For prototyping, consider purchasing pre-formed rods/sheets from distributors like Ensinger or Röchling to minimize waste.