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What is the Difference Detween PEEK and Glass Filled PEEK?

PEEK rod & sheet

In the world of engineering materials, polyetheretherketone (PEEK) has emerged as a versatile and high-performance thermoplastic that finds applications in various industries, including aerospace, medical, automotive, and more. However, not all PEEK variants are created equal. In this blog post, we will explore the difference between two popular forms of PEEK: standard PEEK and glass-filled PEEK. Understanding these distinctions will help engineers and designers make informed decisions when selecting the most suitable material for their specific applications.

PEEK: An Overview
Polyetheretherketone (PEEK) is a semi-crystalline thermoplastic polymer known for its exceptional mechanical, thermal, and chemical properties. It boasts high tensile strength, excellent wear resistance, and a broad operating temperature range, making it an ideal choice for demanding engineering applications. PEEK is inherently lightweight and possesses excellent dimensional stability, which further adds to its appeal in various industries.

Glass-Filled PEEK: Reinforcing for Enhanced Performance
Glass-filled PEEK, as the name suggests, is a composite material obtained by incorporating glass fibers into the PEEK matrix. The addition of glass fibers significantly alters the material’s properties, making it an attractive option for specific use cases.

Mechanical Properties: The glass fibers act as reinforcement, enhancing the overall mechanical strength of PEEK. Glass-filled PEEK exhibits higher stiffness and improved tensile and flexural modulus compared to standard PEEK, making it better suited for load-bearing applications.

Thermal Properties: The presence of glass fibers can influence the thermal expansion characteristics of the material. In some cases, glass-filled PEEK may have a lower coefficient of thermal expansion than standard PEEK, making it more dimensionally stable over a wider temperature range.

Cost Considerations: While glass-filled PEEK offers superior performance, it is generally more expensive than standard PEEK due to the added cost of glass fibers.

Applications of PEEK and Glass-Filled PEEK
Standard PEEK:

Aerospace components
Medical implants and devices
Electrical connectors
Seals and gaskets in extreme environments
Bushings and bearings
Pump and valve components

Glass-Filled PEEK:

High-performance bearings
Structural components
Gears and wear-resistant parts
Seals and rings subject to higher pressures
Injection molding applications
Choosing the Right Material for Your Application
When selecting between standard PEEK and glass-filled PEEK, consider the specific requirements of your application. If you need exceptional mechanical strength and stiffness, particularly in load-bearing scenarios, glass-filled PEEK may be the better choice despite its higher cost. On the other hand, if you require a more cost-effective solution and can compromise on some mechanical properties, standard PEEK could be sufficient for your needs.


In summary, both PEEK and glass-filled PEEK are valuable materials with distinct characteristics that cater to different engineering challenges. Standard PEEK offers a balance of performance and cost-effectiveness, while glass-filled PEEK provides enhanced mechanical strength and stiffness at a higher price point. Understanding these differences empowers engineers to make well-informed decisions when selecting the most appropriate material for their specific applications, ultimately leading to improved product performance and overall efficiency.

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