Ultrasint® PA6 FR
3D printing material

Ultrasint® PA6 FR is an advanced engineering polymer powder for Powder Bed Fusion with an innovative formulation containing a flame-retardant (FR) additive. Combining excellent mechanical and thermal performance with flammability requirements, it is especially suitable for applications in the electronics and transportation sectors.



Surface Look

PA6 FR Material Guide

What is PA6 FR?

PA6 FR is an Halogen-Free Flame-Retardant PA6 powder for advanced applications. This Ultrasint® PA6 FR is an engineering polymer powder made with an innovative formula, containing a flame-retardant (FR) additive. With its halogen-free formulation based on PA6, this 3D printing material is unique, offering new possibilities for a wide-range of new applications from the electronics to public transportation sectors.

3D printed PA6 FR parts are black and manufactured using Selective Laser Sintering (SLS) technology. Please keep in mind that you will have to respect specific design guidelines to avoid any problem during the additive manufacturing process. Be sure to check the material design guidelines while creating your 3D file and before you send it for 3D printing.

What are the possible applications for this material?

PA6 FR combines excellent mechanical and thermal performance with flammability requirements. Indeed, the main feature of Ultrasint® PA6 FR is its broad spectrum of flammability ratings relevant in different application fields.

It is relevant to use this 3D printing material for flammability-sensitive application fields such as electronics, aerospace and public transportation.

For aerospace applications Smoke Density and Smoke Toxicity (FST) tests have been successfully passed. It is offering the possibility to 3D print air ducts, for example. Jigs and fixtures for cables and pipes can be 3D printed.

  • Transportation

V2 rating (UL 94V)

PA6 FR can also be used for buses and transport (ECE-R 118 App.7 test) for use in public buses successfully passed. PA6 FR is the perfect 3D printing material to use for flammability-sensitive application fields.

  • High temperature

HDT/B: 207°

The formula of this innovative material is containing a flame-retardant (FR) additive. PA6 FR is a flame retardant material also offering impressive mechanical properties, offering new possibilities for a wide-range of applications

  • Electronic casing

This high performance material can be used for electronics projects, its has a UL 94 V-2 rating starting at 0.8 mm, and it has a Glow Wire Flammability Index (GWFI) up to 960 °C. PA6 FR is the perfect material to manufacture switchboard parts and any other electronic components.


The printing price of your design is calculated automatically the moment it is uploaded. As you modify your object (changing material, finishing, size, using batch control or hollowing feature, etc.) you will note that the price changes automatically. The pricing is based on a series of factors, including total volume, object size, and bounding box – to name a few.

The estimated shipping time is also calculated automatically as the object is uploaded and each time you make a modification on it. Delivery time should be added to processing time.

For more information, check our pricing page

How does Selective Laser Sintering work?

Sculpteo uses a layer by layer process called Selective Laser Sintering (SLS) to manufacture PA6 FR parts.

The Selective Laser Sintering technology uses a highly specific laser that sinters thin layers of powder together one layer at a time. After each round of lasering, the printing bed is lowered and another layer of powder is evenly swept across the top for another round of sintering. This 3D printing process continues until the part is fully printed according to the 3D file.

Maximum size

   360 x 360 x 420 mm

The maximum size of your models are limited by the physical size of our 3D printers – nothing can be printed larger than the printer bed.

Due to the printing process, your objects will have upskin and downskin. Upskin is a little concave, whereas downskin will show slight convex. Upskin will appear on the top of your object, downskin at the bottom. This is important to consider when you set the orientation of your 3D model. If the upskin and downskin will affect your design, set the orientation beforehand and we will honor it, if you are not sure, our technicians will choose the best one.

Standard layer thickness100µm
Accuracy± 0.3% (minimum of ± 0.3 mm)

Minimum wall thickness  1.5mm

Stemmed elements with support1.5mm
Stemmed elements without support1.5mm

Minimum height and width details

Embossed : 0.5 mm 

Engraved : 0.5 mm

Ratio Depth / width


A detail’s minimum precision is mainly determined by the resolution of our 3D printers. However, during the cleaning process, a fine layer of detail can also be lost. In order for a detail and text to be visible we recommend following our recommended sizes at the very least. It’s possible that particularly fine embossings and engravings will not be visible, as the carving could get filled with excess powder that is later unable to be cleaned out. If an embossing or engraving is an essential part of your design we recommend making them as deep as possible. To ensure a better powder removal (thus a better detail visibility), the width of your details must be at least as big as depth.
Enclosed parts ?Yes
Interlocking parts ?Yes

Our material has the ability to print the most complex designs of our materials . An example of a complex design is a volume enclosed within another volume, like a chain or a ball joint connection. Our printers have the ability to print a fully interlocked chain, with no support structures to remove.

Minimum spacing between fixed walls0.5 mm
Minimum clearance between parts0.5 mm

For a successful 3D print a minimum clearance between objects is required to allow excess material to be sand blown out. If this space is not left within the design, the object will be a solid. This is particularly important for articulated objects – as the space left between the walls will define the object’s ability to move.

Do not forget

Clearance should be at least 0.5 mm, however that is the minimum for small objects. Larger objects require more space between their parts. This is due to the HP printing process. Our printer beds are heated during the process, and larger objects are heated for longer periods. A small space between large objects runs the risk of melting together as it remains under heat for a long period of time. In some other cases, holes should be added to allow us to drain for the excess powder material within the clearance.

Hollowing ?  Yes: 5mm

Our online hollowing optimization tool has the ability to greatly reduce the price and the weight of a print by reducing the amount of material used.

Using the tool requires adding two holes to your model, which will serve as the drain for the excess powder material within the object. The minimum size of these holes is determined by our website. Otherwise, it is possible to hollow your object manually in your 3D modeling software.

Value (Conditioned)


Tensile Strength

41 MPa

ISO 527-2

Tensile Modulus

2450 MPa

ISO 527-2

Elongation at Break

2.6 %

ISO 527-2

Charpy Impact unnotched

7.4 kJ/m²

ISO 179-1

HDT B (0.45 MPa, dry)

207 °C

ISO 75-2

Ready to 3D print with PA6 FR?

With Sculpteo’s online 3D printing service you’re just a few clicks away from professional PA6 FR 3D printing. Your 3D model is printed with the highest quality and delivered straight to your door. 

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