Compared to non-annealed PEEK sheets, PRES annealed stock shapes demonstrate a > 70% reduction in warpage and a > 60% reduction in machining-induced micro-cracking, making them ideally suited for high-precision structural components in semiconductor (wafer handling) and aerospace applications.
The annealing process drives PEEK crystallinity to an optimal range of 38–42%, significantly enhancing key material properties:
Rigidity & Creep Resistance: Flexural modulus increased.
Chemical Resistance: Improved barrier performance against aggressive media (acids, hydrocarbons, hydraulic fluids) at elevated temperatures.
Compactness & Wear Life: 20–30% improvement in wear factor (PV limit) under dry sliding conditions.
Controlled cycle at 250°C ± 5°C with slow cooling (≤10°C/hr) eliminates internal stress. Guarantees ≥98% flatness and dimensional stability of ±0.05mm/m.
Reduces warpage risk by >70% and machining micro-cracks by >60%. Engineered for high-precision semiconductor & aerospace components.
Achieves optimal crystallinity (38–42%). Boosts flexural modulus and improves wear life by 20–30% under dry running conditions.
As a leading PEEK sheets manufacturer, PRES supplies stock shapes engineered to deliver the following intrinsic performance advantages:
High-Temperature Stability — Continuous service at 260°C, short-term peaks up to 300°C+, with a melting point around 343°C and UL 94 V-0 flammability rating without additives.
Exceptional Mechanical Strength (Isotropic) — Tensile strength from 100 MPa (Unfilled) up to 260 MPa (CF30 sheets), with outstanding fatigue resistance in both planar directions.
Superior Chemical and Hydrolysis Resistance — Impervious to most acids, bases, organic solvents, and oils; withstands high-pressure steam and repeated sterilization cycles.
Excellent Dimensional Stability & Flatness — Low moisture absorption (≤0.5%), stress-relieved processing, and thickness tolerances as tight as ±0.20 mm for precision-machined flat parts.
Outstanding Wear Resistance — CF30 grades & Bearing grade deliver exceptional wear performance for slide pads, seals, and bushings without external lubrication.
Reliable Electrical Insulation — Unfilled grade & GF30 Grade Volume resistivity up to 1016 Ω·cm, stable dielectric properties across a wide temperature range, and low smoke/toxic gas emission when exposed to flame.
PRES ESD-grade PEEK sheets deliver permanent, bulk-stable volume resistivity of 10⁶–10⁹ Ω·cm (ASTM D257), with consistent resistivity from core to surface.
Colors: Natural beige (Unfilled, GF30), Black (CF30,ESD)
Custom services: Cut-to-size, CNC milling, surface grinding, custom thickness up to 100 mm
Certifications: Manufactured under ISO 9001; compliant with ISO 527, ISO 75, ISO 22007-4 testing standards
Flatness: Stress-relieved and thermally stabilized to minimize post-machining distortion
Thanks to their exceptional flatness, chemical resistance, and high-temperature performance, PEEK sheets are trusted across the most demanding industries:
Semiconductor and Electronics: Wafer carriers, wet bench components, test sockets, insulating spacers, vacuum chamber liners
Medical and Food: Surgical instrument blanks, orthopedic implant machining stock, food-contact cutting boards (FDA-compliant Unfilled grade)
Aerospace: Interior floor panels, structural supports, thermal barrier shims, high-load bearing pads
Oil and Gas / Chemical: Valve liners, pump diaphragms, chemical process gaskets, downhole tool spacers
Industrial Machinery: Precision wear plates, slide ways, guide rails, conveyor scrapers
Automotive: Transmission thrust washers, brake system shims, engine peripheral insulating panels
Your primary performance driver determines the optimal grade:
flatness and purity → Unfilled;
rigidity and dimensional stability → GF30;
maximum strength and wear resistance → CF30.
See our detailed PEEK Thermal Performance Data for HDT and CLTE reference, or contact our technical team for application-specific recommendations.
The table below summarizes the key mechanical, thermal and processing differences between the three PEEK sheet grades, helping you quickly narrow down the right material.
| Property | Unfilled PEEK | PEEK GF30 | PEEK CF30 | Test Standard |
|---|---|---|---|---|
| Tensile Strength | 100 MPa | 175 MPa | 260 MPa | ISO 527 |
| Flexural Modulus | 4.1 GPa | 11.3 GPa | 24 GPa | ISO 178 |
| HDT (1.82 MPa) | 163 °C | ~315 °C | 315 °C | ISO 75 |
| Continuous Temp. | 260 °C | 260 °C | 260 °C | UL 746 |
| Thickness Range | 1–250 mm | 6–250 mm | 6–250 mm | — |
| Density | 1.30 g/cm³ | 1.51 g/cm³ | 1.40 g/cm³ | ISO 1183 |
| Thermal Conductivity | 0.25 W/m·K | 0.35 W/m·K | 0.95 W/m·K | ISO 22007-4 |
| Water Abs. (24h) | 0.5% | 0.11% | 0.06% | ISO 62 |
| Wear Resistance | Good | Improved | Exceptional | — |
| Color | Natural Beige | Beige | Black | — |
| Electrical | Insulating | Insulating | Conductive | — |
| Machining | Easy | Moderate | Hard (abrasive) | — |
Disclaimer: All values presented herein are typical reference data established per the indicated ISO/ASTM standards. Actual performance of extruded or compression-molded stock shapes will vary with thickness, cooling history, and post-processing conditions, and should not be construed as guaranteed specifications. Lot-specific Certified Analysis reports are available upon request from the PRES technical team.
