Fiberon™ PA6-GF25

Exceptional Strength, Stiffness, and Heat Resistance Fiberon™ PA6-GF25 is a glass fiber reinforced PA6 (Nylon 6) filament containing 25% glass fiber by weight. This advanced composite material delivers outstanding mechanical strength, high stiffness, and excellent thermal properties, making it ideal for demanding engineering, automotive, aerospace, and industrial applications.

Key Features

25% Glass Fiber Reinforcement: Significantly enhances rigidity, strength, and dimensional stability.
Excellent Thermal Properties: Withstands high temperatures, featuring a heat deflection temperature (HDT) of up to 191°C after annealing.
Superior Layer Adhesion: Maintains strong interlayer bonding for durable, cohesive prints.
Minimal Warping: Warp-Free™ technology allows printing at lower bed temperatures (40–50°C), reducing the risk of warpage and improving dimensional accuracy.
High-Speed Printing: Compatible with print speeds up to 300 mm/s.

Easy-to-Use for Advanced Users Fiberon™ PA6-GF25 does not require a heated chamber and can be printed reliably on high-performance FDM/FFF 3D printers equipped with a hardened steel nozzle due to the abrasive nature of glass fibers. For best results, filament drying before printing and post-print annealing (100°C for 10–16 hours) are strongly recommended to maximize mechanical and thermal performance.

Same Trusted Formula, New Name Fiberon™ PA6-GF25 is the same high-performance material as PolyMide™ PA6-GF, now under the Fiberon™ brand.

Choose Fiberon™ PA6-GF25 for applications requiring maximum strength, stiffness, and heat resistance without compromising printability or layer adhesion.

Printing Recommendations

Nozzle temperature

280 - 300°C

Build plate temperature

40 - 50°C

Environmental temperature

Room Temperature

Fan speed

Printing speed

30 - 300 mm/s

Printing Tips

This material has a requirement that you print with an all metal hotend that can reach 280˚C or higher as well as the need for a hardened nozzle.

Do not set your build plate above 50˚C and keep any chamber doors open. If you let the build plate or ambient air get above 50˚C, you run the risk of warping or ugly prints.
Use a glue stick or Magigoo PA if experiencing any issues with bed adhesion.
PA-CF is very hygroscopic and therefore should only be printed while kept in a heated filament dryer the entire time you print.
If you hear "popping" or "cracking" noises, then the filament needs to be dried.
This needs to be annealed after printing at 100˚C for 16 hours.
After annealing - the part will be dried out and therefore need to be moisture conditioned.
Moisture conditioning will happen even if you do nothing as the material absorbs moisture from the air. To speed up moisture conditioning, keep in a humid environment for 48 hours.

FAQ

What is annealing?

You can find out more about annealing HERE.

What is moisture conditioning?

Moisture conditioning refers to allowing the print to absorb moisture. This is inevitble since nylons are hygroscopic, but you can expedite the process by keeping the print in a high humidity climate, or submerging them in water, for 48 hours. All of our test specimens were annealed at 100˚C for 16 hours, and then immerged in water at 60˚C for 48 hours. The average moisture content of specimens is 2.57%.

Read more about moisture conditioning HERE.

Should I anneal before or after moisture conditioning?

When you anneal in a convection oven, you will dry the part out. So if you moisture condition before annealing - you will need to moisture condition again after. So we would suggest to moisture condition after annealing.

Why do you use such a low build plate temperature with your nylons?

Our nylons come with our Warp-Free™ Technology. In order for this Warp-Free™ technology to work as it should - we want to make sure the build plate and the ambient air temperatures are both below 50˚C. We then anneal the print after to get it's full strength.

Learn more HERE

Will the spools work in an AMS?

Yes! We have redesigned the edges of our spools so all Polymaker products will now spin great in the AMS.

That said - you will need to be careful when using any abrasive materials in the AMS.

Do I need a filament dryer?

Yes, you will need a filament dryer when printing with nylons due to them being hygroscopic.

Can you make Fiberon spools in 1KG?

Unfortunately we are not offering 1KG Fiberon™ options and this has to do with the increased chance of carbon fiber and glass fiber filament snapping on the spool.

Since carbon fiber and glass fiber filament is more brittle, we spool these with a larger core. This larger core means that 1KG of filament will not fit on a 1KG spool. 3KG options of all Fiberon™ spools are available though.