Formlabs Formlabs Rigid 4000 Resin (1L) for Form 4


Formlabs Rigid 4000 Resin offers exceptional stiffness and precision and is glass-filled for enhanced durability. Comparable to PEEK/PEKK thermoplastics, this material is ideal for engineering-grade prototypes and load-bearing parts as it features high tensile strength, resistance to heat, pressure, and chemicals. Compatible with various Formlabs printers and tanks, this resin is perfect for detailed molds, models, and industrial manufacturing.

  • Stiffness akin to PEEK/PEKK thermoplastics
  • High tensile strength for demanding applications
  • Smooth, matte finish enhances aesthetics
  • Cartridge compatible with Form 4 3D printers
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Product No. M-5XJ-K1N9

Rigid 4000 Resin


Achieve engineering excellence with Rigid 4000 Resin, boasting stiffness comparable to PEEK and PEKK thermoplastics. This glass-filled resin excels in precision, heat and chemical resistance, and sports a smooth, matte finish. Ideal for engineering-grade prototypes and load-bearing parts, it offers the highest tensile strength in Formlabs' Engineering Resin Library, ensuring your projects withstand significant loads without compromising aesthetics or performance.

Key Features of the Formlabs Rigid 4000 V1 Resin:

  • Stiffness comparable to PEEK/PEKK thermoplastics
  • Glass-filled for enhanced durability and performance
  • Resists deformation under force, heat, pressure, and torque
  • High tensile strength for engineering-grade prototypes
  • Precision in printing detailed molds or models
  • Smooth, matte, polished finish
  • Ideal for load-bearing applications and general industrial parts manufacturing

High Strength
69 MPa
Ultimate Tensile Strength
4.1 GPa
Tensile Modulus
105 MPa
Flexural Strength
Form 4 / 4B
Form 3L / 3BL
Form 3+ / 3B+
Form 3 / 3B
Form 2
Resin Tank(s) [RT]
Form 4 / 4B RT
Form 3L / 3BL RT V2
Form 3L / 3BL RT V1
Form 3 / 3B RT V2.1
Form 2 LT Tank
Build Platform(s) [BP]
Form 4 BP Flex
Form 4 BP
Form 3L BP 2L
Form 3L BP
Form 3 Stainless Steel BP
Form 3 BP 2
Form 3 BP

*The resin is compatible with these 3D printers. Please ensure you're selecting the correct cartridge compatibility at purchase as the Form 4 uses a different cartridge system from previous models. The listing you are currently on is for the Form 4.

For the Form 3 series / Form 2 compatible cartridges, click here.

Why Choose Rigid 4000 Resins?

Rigid 4000 Resin sets the standard for tensile strength within Formlabs' Engineering Resin Library, offering unparalleled stiffness and resistance, ideal for producing parts with precision and a professional finish.

  • Top Tensile Strength: Leads in tensile strength, thanks to its glass-filled composition.
  • Durability: Exceptionally stiff, resisting deformation from various forces and stresses.
  • Resilience: Offers high thermal and chemical resistance, enduring tough conditions.
  • Precision and Aesthetics: Enables the creation of strong, detailed models with a smooth, matte appearance.
Formlabs Rigid 4000 Resin

Formlabs Rigid 4000 Resin

Rigid 4000 Resin Applications

Formlabs Rigid 4000 Resin is ideal for crafting engineering-grade prototypes and parts with the strength to bear loads, closely simulating the stiffness of PEEK.

  • Versatile Applications: Perfect for mounts, brackets, and other structural components.
  • Thin-Walled Designs: Suitable for creating precise, thin-walled parts with robustness.
  • Tooling: Ideal for manufacturing jigs, fixtures, and other tooling necessities.
  • PEEK-Like Stiffness: Offers a stiffness comparable to PEEK, broadening its utility in demanding applications.

What are the Material Properties* of the Formlabs Rigid 4000 Resin?

Ultimate Tensile Strength 69 MPa
Tensile Modulus 4.1 GPa
Elongation 0.053
Flexural Modulus 3.4 GPa
Notched Izod 23 J/m
Heat Deflection Temp. @ 0.45 MPa 77°C
Thermal Expansion, 0 - 150 °C 63 μm/m/°C

* Material properties can vary with part geometry, print orientation, print settings, and temperature. Data was obtained from parts printed using Form 3, 100 μm, Rigid settings and post-cured with a Form Cure for 15 minutes at 80°C.

Download the Formlabs Rigid 4000 Resin Technical Data Sheet
Download the Safety Data Sheet

Formlabs Form Wash (Gen 2) Formlabs Form Cure
Duration Duration
15 min in IPA 15 min
Notes Notes
Rigid 4000 Resin contains glass particles,
which strengthens printed parts. Maintain
separate wash buckets to prevent glass
particles adhering to parts printed with
other resins.
For parts printed in an engineering-focused
resin (such as those in the Rigid, Tough &
Durable, and Flexible & Elastic families),
post-curing ensures that the parts reach
their optimal mechanical properties and
can function as designed. There is only one
recommended post-curing time for Rigid
4000 Resin V1.

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