PEKK Filament for High-Temperature 3D Printing: Performance Without the Processing Challenges of PEEK

PEEK often sets the benchmark for high-temperature polymers, but its processing demands limit where it can realistically be used in additive manufacturing. However, there is a PAEK material that combines high-performance properties with far greater printability.

PEKK, or polyetherketoneketone, belongs to the polyaryletherketone (PAEK) family, the same class of high-performance polymers as PEEK. While the two materials are closely related, PEKK is significantly easier to process in 3D printing, making it a more accessible option for many high-temperature 3D printing applications.

One of the most important differences between PEKK and PEEK is crystallization behavior. PEKK crystallizes much more slowly than PEEK, which is a major advantage in additive manufacturing. Rapid crystallization can prevent proper layer-to-layer bonding, leading to weak Z-axis strength. By slowing that process down, PEKK allows each new layer to bond more effectively, resulting in stronger, more reliable 3D printed parts.

That lower crystallinity also improves dimensional stability. In PEEK, crystallization is a primary driver of warping, especially in larger parts. PEKK’s reduced crystallinity helps minimize internal stresses, making warp and shrink far easier to control during printing. For engineers working with high-performance 3D printing filaments, this translates to more predictable outcomes and improved part accuracy.

PEKK also requires less heat to process than PEEK, which dramatically expands the number of industrial 3D printers capable of printing it successfully. PEEK often requires chamber temperatures between 90 and 200 degrees Celsius and nozzle temperatures ranging from 375 to 450 degrees Celsius. PEKK, by comparison, can be processed with chamber temperatures as low as 25 degrees Celsius and up to around 150 degrees Celsius, with nozzle temperatures typically between 350 and 380 degrees Celsius. This makes PEKK a practical alternative for users who want PAEK-level performance without the extreme thermal requirements of PEEK.

At 3DXTECH, the primary focus is on PEKK-A, the amorphous variant of PEKK. PEKK is available in both amorphous and semi-crystalline forms, commonly referred to as PEKK-A and PEKK-C. While both offer excellent performance, PEKK-A is much easier to print and far more forgiving when it comes to controlling warp and shrink, making it the preferred choice for additive manufacturing environments.

In terms of material properties, PEKK filament offers a tensile strength of approximately 105 megapascals and a tensile modulus of around 2,750 megapascals, with a tensile elongation of about five percent. Flexural strength is roughly 95 megapascals, with a flexural modulus near 2,680 megapascals. Thermally, PEKK-A has a heat deflection temperature of around 150 degrees Celsius and a melt temperature of approximately 305 degrees Celsius. The base resin used in this high-performance filament is also UL 94 V-0 rated down to 0.8 millimeters.

Like many ultra-performance polymers, PEKK is most commonly used in industries where heat resistance, chemical resistance, and reliability are critical, particularly aerospace and oil and gas. In aerospace applications, PEKK’s low outgassing behavior, high strength-to-weight ratio, and thermal stability make it well suited for vacuum environments. For components intended for spaceflight or high-altitude operation, PEKK is often a material worth serious consideration. PEKK has been approved for space-ready components by Lockheed Martin, and Boeing has approved PEKK for select in-flight applications as well.

In the oil and gas industry, PEKK’s chemical resistance is where it truly stands out. While its temperature resistance is critical, its ability to withstand aggressive chemicals sets it apart from many other high-performance polymers. PEKK is commonly used for components such as seal rings, flow lines, and choke lines, where long-term exposure to harsh environments is unavoidable.

Overall, PEKK is an ultra-performance 3D printing filament that challenges the assumption that higher material performance must come with increased printing difficulty. For applications requiring high temperature capability and excellent chemical resistance without the complexity and processing demands of PEEK, PEKK presents a compelling alternative.

For additional details on PEKK, explore the product page or connect with the team for application-specific support.

PEKK Filament FAQs: 3D Printing, Properties, and Industrial Applications

What is the difference between PEKK and PEEK in 3D printing?

PEKK and PEEK are both part of the PAEK family of high-performance polymers, but PEKK offers slower crystallization, which improves layer adhesion and reduces warping. This makes PEKK significantly easier to print while still delivering similar thermal and mechanical properties.

Why is PEKK easier to 3D print than PEEK?

PEKK’s slower crystallization rate allows better interlayer bonding and reduces internal stresses during printing. It also requires lower chamber and nozzle temperatures, making it compatible with a wider range of industrial 3D printers.

What applications are best suited for PEKK filament?

PEKK filament is ideal for demanding applications in aerospace, oil and gas, and industrial manufacturing where high heat resistance, chemical resistance, and structural integrity are required. Common uses include aerospace components, seal rings, and parts exposed to harsh chemical environments.