PEN: from elite material to new frontier for biomedical 3D printing

In the world of 3D printing, where mechanical performance, biocompatibility, and ease of processing are intertwined, a new material is emerging strongly.

Polyethylene naphthalate (PEN) is an aromatic polymer developed in the early postwar decades as an enhanced version of the better-known PET (polyethylene terephthalate). Originally used in the electronics and packaging industry for its outstanding barrier, mechanical and thermal properties, it has found wide use in high value-added applications: from bottles for pharmaceuticals and cosmetics, to dielectric films for displays and capacitors, to blister packs for pharmaceuticals.

What has always distinguished PEN is its resistance to chemicals, dimensional stability at high temperatures, and superior mechanical stiffness compared to other polyesters. These characteristics made it a niche material for years, often relegated to specific uses in the medical, food, and chemical industries.

Today, thanks to innovation brought by FLXR Engineering, PEN is experiencing a new youth as an FDM 3D printing filament, opening the door to accessible and versatile use in rapid prototyping and biomedical component manufacturing as well.

Un poliestere d’élite per applicazioni critiche

PEN represents the pinnacle of performance among polymers in the polyester family (PETG, PET, PBT), offering:

• Exceptional chemical and hydrolytic resistance
• Dimensional stability even in sterilizing environments
• Very high mechanical properties

Biocompatibility and certified safety

PEN-Natural is designed specifically for medical applications. It meets the standards:

• USP <87> e <88> Class VI
• ISO 10993-4, -10, -17
• FDA 21 CFR 177
• Compatibility with sterilization by autoclave, EtO, gamma ray and e-beam

Analyses show oligomeric extraction values much lower than PET and PVDF, ensuring safe use in medical devices, bioactive liquid containers, surgical guides and chemical analysis components.

Superior mechanical performance

Tests conducted according to ISO 527, ISO 178 and ISO 180 show that PEN-Natural maintains a winning combination of elastic modulus, tensile strength and impact resilience, even after autoclave cycles at 132°C.

Applicazioni reali nei settori medicale, elettronico e chimico

Case studies collected by FLXR highlight the extreme versatility of the material:

1. Dental surgical guides

• Material cost for dental surgical guide will be less than 1 euro, cheaper than resin
• Mechanical strength is strong and surface finish is very smooth, much easier than resin process
• Material size is stable after autoclaving and disinfection in 70% ethanol for a few minutes. The material size is stable after autoclaving and disinfection in 70% ethanol for 15 minutes.

2. Microfluidic chips

• Due to chemical and hydrolytic resistance, PEN-Natural does not react with protein reagents and nucleic acids
• High biocompatibility for interaction with cells
• High mechanical properties, especially elastic modulus, which prevent channel deformation upon application of high fluid pressure
• Transparency of the material that ensures visual observations of proper flow and interaction of reactants

3. Bone cement disposable molds to prepare spacers for orthopedics

• The spacers are indicated for temporary knee replacement as part of two-stage joint endoprosthesis revision in case of infection and inflammatory reactions after explantation of an existing joint endoprosthesis.
• Excellent mechanical and dimensional stability
• Autoclavable up to 130°C

4. Disposable components and tools for diagnostics and fluid management

• Savings of about 25 percent on cost per part compared to injection molding
• Exceptional chemical resistance
• Multiple modes of sterilization by steam (autoclave), gamma ray and EtO

Sustainability and ease of printing

With low moisture sensitivity, resistance to warping, and ease of printing comparable to consumer polymers, PEN-Natural is proposed as a high-performance material suitable for even high-end desktop printers (e.g., BambuLab X1E).

The filament is available in 1.75 mm and 2.85 mm diameters, with tolerances < ±0.03 mm, guaranteed by life-science grade automated extrusion lines.

Conclusion

FLXR Engineering's PEN-Natural represents a major breakthrough in 3D printing for biomedical applications. It offers a unique combination of mechanical performance, chemical safety, regulatory compatibility and cost-effectiveness, making it ideal for:

• Disposable medical devices
• Parts for diagnostic instruments
• Labware for analytical chemistry

For companies operating in the biomedical or biotech sectors, it presents a reliable and competitive alternative to materials such as PEEK or PPSU, PEN Natural is a choice that combines innovation, sustainability and performance.

For more technical details or to receive a sample, contact us.

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Buy PEN Natural on crea3d.com