PEEK (Polyether Ether Ketone) is a premium thermoplastic engineering polymer celebrated for its outstanding mechanical, thermal, and chemical resistance properties. Known for exceptional durability and performance in extreme environments, PEEK is a go-to material for demanding industries such as aerospace, automotive, medical, electronics, and high-end manufacturing.
While all PEEK shares the same base chemical structure, different grades have been developed to meet specific performance requirements. Understanding these distinctions can help engineers, designers, and buyers choose the most suitable grade for their applications. Below, we examine the four primary grades of PEEK, their unique attributes, and the industries where they excel.
Unfilled PEEK is the most basic and widely used form of PEEK. It contains no reinforcing additives, which gives it excellent toughness, high elongation, and remarkable fatigue resistance. Despite being unmodified, it maintains impressive strength, chemical resistance, and stability.
Key advantages include:
l High purity – compliant with FDA standards for food contact and medical applications.
l Excellent biocompatibility – suitable for implants and surgical instruments.
l Thermal resistance – retains performance at elevated temperatures.
Typical applications range from medical devices and food processing equipment to aerospace and electronics components where cleanliness, safety, and versatility are essential. It is often available in colors like white, natural light brown, and black.
Glass-filled PEEK incorporates glass fibers, significantly improving rigidity, tensile strength, and dimensional stability, especially in high-heat environments. The fibers reduce thermal expansion, making it highly dimensionally stable under load.
Key advantages include:
l Enhanced load-bearing capacity.
l Superior structural integrity in high-temperature conditions.
l Reduced thermal expansion compared to unfilled PEEK.
Commonly used in pump components, valve seats, compressor parts, and mechanical seals, this grade is ideal for applications that demand structural strength and long-term stability. However, it is more abrasive than unfilled PEEK, so designers must consider mating part wear.
Carbon-filled PEEK is reinforced with carbon fibers, which deliver exceptional stiffness, compressive strength, and outstanding wear resistance. It also provides improved thermal conductivity, allowing it to dissipate heat more effectively during operation.
Key advantages include:
l Excellent wear resistance for moving parts.
l Higher thermal and electrical conductivity than unfilled or glass-filled grades.
l Outstanding performance in high-load, high-temperature environments.
This grade is widely used in bearings, bushings, aerospace structural parts, and automotive components. The black color of carbon-filled PEEK comes from its fiber content, and it is favored where a combination of strength, heat tolerance, and wear resistance is critical.
Bearing grade PEEK is specially formulated with solid lubricants such as PTFE, graphite, and sometimes carbon fiber. These additives provide exceptional tribological properties, resulting in very low friction, reduced wear, and extended component life.
Key advantages include:
l Lowest coefficient of friction among PEEK grades.
l Superior wear resistance in continuous motion applications.
l Excellent performance under heavy loads and at high speeds.
This grade is ideal for thrust washers, bushings, and sliding or rotating components in sectors such as aerospace, automotive, and industrial machinery. It performs exceptionally in harsh environments where lubrication is limited or maintenance intervals are long.
The choice between unfilled, glass-filled, carbon-filled, and bearing-grade PEEK depends on the specific mechanical, thermal, and wear performance requirements of your application. Key considerations include:
Operating temperature range.
l Load and wear demands.
l Chemical exposure.
l Electrical or thermal conductivity needs.
At YILONG, we supply a comprehensive range of PEEK rods, sheets, and machined parts, available in all major grades to meet diverse industrial requirements. Our products are manufactured to the highest quality standards, ensuring exceptional consistency, reliability, and performance in demanding applications.
Whether you require a biocompatible solution for medical devices, a structurally reinforced material for mechanical parts, or an advanced low-friction option for high-speed bearings, YILONG can deliver the right solution. Our technical team is ready to assist you in selecting the most suitable PEEK grade for your project and ensuring that your components meet or exceed performance expectations.
Contact YILONG today to discover how our PEEK materials can elevate your product performance and help you achieve engineering excellence.
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Polyether Ether Ketone (PEEK) is recognized in engineering circles as one of the most capable thermoplastic polymers available. It offers a rare balance of mechanical strength, chemical resistance, and thermal stability, making it an excellent choice for situations where both performance and durability are paramount. From aerospace components to medical implants, PEEK’s reliability in extreme environments ensures its continued relevance as industries demand more from their materials.
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