Formlabs® PU Rigid 650


PU Rigid 650 


Make Pliable, Tough, and Impact Resistant Parts

PU Rigid 650 resin from Formlabs is a polyurethane material specifically formulated to withstand extensive testing and perform under stress. 3D-printed parts with this resin are pliable, yet tough and impact-resistant that are capable of maintaing dimensional accuracy under stress.
Disclaimer — For commercial and research use only. Do not use this material in or around households or residences, or for recreation purposes, or outside of a commercial or research facility or institution.

For Impact Resistant and Semi-Stiff Polyurethane Parts


Optimize your production with Formlabs’ advanced polyurethane parts, designed for unparalleled durability and flexibility. These parts effortlessly withstand extreme impacts and harsh conditions without compromising on dimensional accuracy, even under substantial load. They are perfect for industries demanding high performance and reliability. 

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Image of a wheel 3D printed in Formlabs PU RIgid 650 resin

Material Properties

Proto3000_Icons_Tensile Strength

34.0 ± 3.4 MPa

Proto3000_Icons_Tensile Modulus

0.67 ± 0.06 GPa

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22.0 ± 1.1 MPa

Proto3000_Icons_Elongation at Break

170 ± 17 %

Performance Scale

Modulus | Stiff-to-Pliable
Elongation | Low-to-High


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PU Rigid 650 vs. PU Rigid 1000 | A Hybrid Chemistry

Polyurethane resins are known for their exceptional long-term durability and stability in varying conditions such as UV exposure, high temperatures, and humidity. PU Rigid resins are a great choice due to their flame-retardant properties, sterilization ability, and resistance to chemicals and abrasion. Their hybrid chemistry (a custom combination of acrylate and urethane) makes them more durable and longer-lasting than other SLA resins — based on accelerated aging data. The hybrid chemistry and a humidity cure bring the printed parts to their finished, elevated polyurethane state.


Why Select PU Rigid 650 Resin?

Produce long-lasting and durable parts using 3D printing technology to minimize costs associated with tool changes, setups, and re-prints. Apart from exceptional properties, PU Rigid 650 has also ISO 10993-1 Skin Contacting Device Certification. Embrace the advantages of SLA 3D printing over traditional polyurethane manufacturing to significantly improve time and cost efficiencies.


Extremely Durable and Long-term Stable

  • Ready to withstand loads and harsh environments
  • This material absorbs minimal moisture and is resistant to light, heat, and chemicals.


Image of PU Rigid 650 resin cartridge with a 3D-printed part on top from Formlabs

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Pliable and Exceptional Quality

  • Maintains proper shape and mechanical properties over time.
  • It allows for complex geometries and balances strength, functionality, and design.

Image od parts 3D printed in PU Rigid 650 resin from Formlabs

Proto3000_Icon_Connecting Rod

Demanding Mechanical Applications

Use PU Rigid 650 Resin to enhance the durability of mechanical components. This advanced material is designed to produce high-performance polyurethane parts that excel in demanding mechanical applications.

  • Impact-resistant components
  • Pliable mechanical connectors
  • Shock-absorbing bumpers and dampeners
  • Noise-dampening components

Engineering parts 3D printed in PU Rigid 650 resin by Formlabs

3D Printing Workflow

Screenshot of Formlabs' PreForm Software for generating 3D design files


Produce 3D File(s)

Using PreForm™ software, generate your print file with proper supports, orientation, and layout and then upload the file to your 3D printer.

Image shows a 3D printing technician preparing Formlabs SLA 3D printer with PU Rigid material


Prepare the 3D Printer

Fill the self-dispensing cartridge with PU resin carefully. Subsequently, properly insert the cartridge into the 3D printer, ensuring it’s within a dry cabinet. It’s important to accurately load both your Build Platform and Resin Tank to initiate the 3D printing process. 

Close-up of someone starting the Formlabs Form 3 printer


3D Print

Simply follow the clear prompts on the user-friendly touchscreen to confidently start your print.


Image of a curing chamber with PU RIgid - polyurethane parts in it



Place the Build Platform in a brief PGDA wash, then allow the parts to air dry or use an air compressor. Remove the parts from the platform and from the supports. When dry, set the parts in the humidity cure chamber for a minimum of a couple of days of post-curing.


Watch the Detailed 3D Printing Workflow for Polyurethane Resins.

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Material Safety Datasheets

Access Database


During the post-processing step, you can place the Build Platform in a brief PGDA wash, then allow parts to air dry or use an air compressor. Remove parts from the platform and 3D-printed supports. When dry, set the parts in the humidity cure chamber for a minimum of a couple days of post-curing.



Two minutes in PGDA (Propylene Glycol Diacetate)


To clean PU Rigid 650 Resin components, use Propylene Glycol Diacetate (PGDA). Ensure the parts are thoroughly air-dried. To speed up the drying process, consider using an air compressor or rinsing with N-butyl acetate.

form wash and form cure



Utilize a Humidity Cure Chamber for the period indicated for your material and part thickness, at least a few days.

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Post-Cured¹ Material Properties Data

Ultimate Tensile Strength
Ultimate Tensile Strength
34 ± 3.4 MPa
Young's Modulus
Young's Modulus
0.67 ± 0.06 GPa
Elongation at Break
Elongation at Break
170 ± 17 %
Flexural Strength
Flexural Strength
22 ± 1.1 MPa
Flexural Modulus
Flexural Modulus
0.57 ± 0.03 GPa
Ross Flexing Fatigue (unnotched)
Ross Flexing Fatigue (unnotched)
> 50,000 cycles (PASS-no crack propagation), ASTM D 1052 (-10 °C & 23 °C )
Notched Izod
Notched Izod
375 J/m
Charpy Impact Test (Notched)
Charpy Impact Test (Notched)
44 kJ/m²
Tabor Abrasion
Tabor Abrasion
101 mm³
Shore D, 63
Density (solid)
Density (solid)
1.16 g/cm³
@ 25 ºC — 1070 cP
@ 35 ºC — 519 cP
Heat Deflection Temperature
Heat Deflection Temperature
@ 1.8 MPa — 59 °C
@ 0.45 MPa — 82 °C
Thermal expansion
Thermal expansion
130.4 μm/m/°C
Glass Transition Temperature
Glass Transition Temperature
Tg1: -19 °C
Tg2: 142 °C
Flammability Properties
Flammability Properties
  • Rating - HB
  • Smoke Density: (D s 1.5) = 15 (PASS); (D s 4.0) = 262 (FAIL)

¹Material properties may vary based on part geometry, print orientation, print settings, temperature, and disinfection or sterilization methods used. Data for post-cured samples were measured on Type IV tensile bars 3D-printed on a Form 2 printer with 100 µm PU Rigid 650 Resin settings, washed in a Form Wash for 2 minutes in ≥99% PGDA, and post-cured.