Introduction to PEEK Sheet

PEEK sheet is a plate-shaped profile primarily made from polyetheretherketone (PEEK) resin through high-temperature extrusion or compression molding processes. PEEK is a semi-crystalline, ultra-high-performance specialty engineering plastic, often hailed as the "pinnacle" of the plastics industry. Due to its exceptional combination of properties, PEEK sheet has become one of the ultimate solutions for replacing metals, ceramics, and other plastics, finding widespread use in various demanding high-end industrial environments.

Core Characteristics and Value

The performance of PEEK sheet is comprehensive and outstanding, reaching the top tier of thermoplastics in almost all aspects.

1. Exceptional Heat Resistance:

   • Long-term service temperature up to 250°C, with short-term tolerance exceeding 300°C.

   • Glass transition temperature (Tg) ~143°C, melting point (Tm) ~343°C.

   • Heat deflection temperature (1.8 MPa) is as high as 160°C (unfilled) and can exceed 300°C when carbon fiber reinforced.

2. Extremely High Mechanical Properties:

   • Possesses very high strength, stiffness, and hardness. Its tensile strength and fatigue resistance surpass those of many metals.

   • Excellent creep resistance, with minimal deformation under long-term load and good dimensional stability.

3. Outstanding Chemical Resistance:

   • Excellent corrosion resistance against the vast majority of chemicals, including acids, alkalis, oils, hydrocarbons, salt solutions, and organic solvents.

   • Only a few highly corrosive chemicals like concentrated sulfuric acid and hydrofluoric acid can attack it.

4. Excellent Tribological Properties:

   • Good self-lubrication, low friction coefficient, extremely high wear and abrasion resistance, performing well even without lubrication.

5. Flame Retardancy, Low Smoke & Toxicity:

   • Inherently UL94 V-0 flame retardant, produces very low smoke and low-toxicity gases when burned.

6. Superb Electrical Properties:

   • Maintains stable electrical insulation even under harsh conditions like high temperature, high pressure, and humidity.

7. Hydrolysis Resistance:

   • Can be used long-term in high-temperature, high-pressure steam or water environments without performance degradation. Excellent hot water resistance.

8. Radiation Resistance:

   • High resistance to high-energy radiation, suitable for use in environments with radiation such as aerospace and nuclear industries.

Main Types

Based on reinforcement materials, PEEK sheets can be categorized into the following types to meet different performance needs:

Basic Performance Data Table

The table below compares typical performance parameters of different types of PEEK sheets.

Main Application Fields

PEEK sheet finds applications across nearly all high-end manufacturing sectors:

• Aerospace: Aircraft interior panels, structural parts, bearings, insulators, seals.

• Medical Devices: Surgical instruments, trauma repair devices, diagnostic equipment components. (Requires certification for implantable use).

• Semiconductor Industry: Wafer carriers, CMP retaining rings, etching machine parts, cleanroom equipment, meeting high purity and chemical resistance demands.

• Industrial Equipment: High-performance seals, bearings, gears, piston rings, pump/valve parts, compressor valve plates, wear plates.

• Automotive Industry: Transmission components, engine covers, braking system parts, connectors.

• Food Processing: Wear-resistant, high-temperature parts compliant with food contact regulations.

• Electronics & Electrical: High-performance insulating plates, connectors, coil bobbins.

Processing and Considerations

• Processing Methods: PEEK sheet is very suitable for CNC precision machining, such as turning, milling, drilling, planing, and grinding, allowing for easy fabrication of complex parts.

• Important Considerations:

  • High Cost: Both raw material and processing costs are significantly higher than standard engineering plastics.

  • Machining Requirements: Require sharp carbide or diamond tools with appropriate cutting speeds and cooling (air cooling is often recommended) to prevent material melting.

  • Anisotropy: Reinforced PEEK sheets (e.g., CF/PEEK) may exhibit different properties in different directions; this should be considered during design.

Conclusion

PEEK sheet is an almost perfect ultra-high-performance specialty engineering plastic sheet. It combines exceptional properties like heat resistance, high mechanical strength, chemical corrosion resistance, flame retardancy, self-lubrication, and hydrolysis resistance, enabling it to withstand the most extreme and demanding working environments. Despite its high cost, PEEK sheet provides irreplaceable value in high-end manufacturing and cutting-edge technology sectors that prioritize equipment reliability, longevity, lightweight design, and maintenance-free operation. It is truly a "problem-solving" material.