PEEK Material Properties: An Overview of Polyether Ether Ketone

The Ultimate Guide for Engineers and Designers

Polyether Ether Ketone (PEEK) is a high-performance thermoplastic known for its exceptional properties, making it suitable for various demanding applications.

Below are the key material properties of PEEK:

Mechanical Properties

Tensile Strength: PEEK exhibits a tensile strength ranging from 10.2 to 14.9 ksi (approximately 70 to 103 MPa) depending on the grade.

Yield Strength: The yield strength is between 12.6 to 13.8 ksi (approximately 87 to 95 MPa) .

Elongation at Break: PEEK can elongate between 30% to 150%, indicating good ductility under stress.

Hardness: The Vickers hardness ranges from 26.1 to 28.5 HV, demonstrating its rigidity.

Creep Resistance: PEEK maintains its mechanical properties under long-term loads, making it highly resistant to creep.

Thermal Properties

Melting Temperature: PEEK has a melting point between 322°C and 346°C (approximately 612°F to 655°F) .

Glass Transition Temperature: The glass transition temperature is around 143°C ( approximately 289°F ) .

Maximum Service Temperature: It can be used continuously at temperatures up to 260°C (approximately 500°F) without significant degradation.

Chemical Resistance

PEEK is resistant to a wide range of chemicals, including acids, bases, and organic solvents. It has low moisture absorption and does not undergo hydrolysis, making it suitable for use in humid environments.It is also resistant to steam and high-pressure water, maintaining its properties even after prolonged exposure.

Electrical Properties

PEEK is an excellent electrical insulator with high volume resistivity, making it suitable for electrical applications.Its dielectric strength is around 22 kV/mm, indicating strong insulation capabilities.

Other Notable Properties

Low Friction Coefficient: PEEK exhibits low friction, making it ideal for bearing applications.

Biocompatibility: It is FDA-approved for medical applications due to its biocompatibility and ability to withstand sterilization processes.

Flame Retardancy: PEEK has a V0 flammability rating and generates low smoke and toxic gases when exposed to fire.

Applications

Due to its exceptional properties, PEEK is widely used in various industries, including:

Aerospace components

Medical devices and implants

Automotive engine parts

Semiconductor manufacturing

Chemical processing equipment

In summary, PEEK's unique combination of mechanical strength, thermal stability, chemical resistance, and electrical insulating properties makes it one of the most versatile and high-performing thermoplastics available today.