Formlabs® Flame Retardant


Flame Retardant Resin

Flame, smoke, and toxicity (FST) SLA 3D printing material

Flame Retardant (FR) resin is an ideal specialty material for manufacturing durable plastic components engineered for stiffness, creep resistance, and optimal performance in both indoor and industrial settings. This Formlabs resin boasts self-extinguishing properties and is halogen-free, earning high marks for flame, smoke, and toxicity (FST) safety ratings.

Self-Extinguishing & UL 94-Certified Flame Retardant Material

Formlabs’ Flame-Retardant resin is ideal for high-requirements and standard applications in all industries, such as aviation, electronics, medical devices, transportation, etc. Traditionally, with processes like injection molding or polyurethane casting, it may take up to 30 days to make parts that pass FAR 25.853(a) flame standards, smoke and toxicity tests, or are UL 94 V-0 certified. With Formlabs’ Low Force Stereolithography 3D printing technology and UL 94-certified self-extinguishing Flame-Retardant resin, you can have parts done in up to 6 days*.

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*Formlabs lead time estimate for 20 parts.

Material Properties

Proto3000_Icons_Tensile Strength

41.0 MPa

Proto3000_Icons_Tensile Modulus

3.1 GPa

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75.0 MPa

Proto3000_Icons_Elongation at Break


Performance Scale

Injection Molded Look & Feel
Heat and Creep Resistance
Flammability Resistance


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The Benefits of Using Flame Retardant Resin 

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Accelerated Production Lead Times

Producing flame-retardant parts with SLA 3D printing can substantially reduce lead times compared to traditional manufacturing processes. How? By eliminating many processing steps. For example, polyurethane casting involves the following:

  • 3D printing or machining a mold pattern
  • Construct silicone mold
  • Find a UL-rated polyurethane material
  • Pour into mold
  • Extract casted part, which most of the time is a tedious work
  • Post-processing

With Formlabs Flame Retadardant resin, the manufacturing workflow is as easy as any other polymer part. Open the digital model in Formlabs’ PreForm software Select the resin and desired layer thickness  Orient to preserve fine details Generate Supports Send to print.

Image of parts for Electronics industry 3D printed in Flame Retardant resin by Formlabs

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A Halogen-Free Material

Specifically Formulated for:

  • Transportation
  • Aviation
  • Manufacturing
  • Electronics
  • Medical and
  • Aerospace industries

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Look and Feel of Injection Molded Parts

Fabricate self-extinguished plastic parts that have a great surface finish and are far superior to other 3D printing technologies, such as FDM 3D printing.

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Produce certified flame retardant, UL 94 V-0, and FAR-rated 3D-printed parts that meet the certification requirements for enduring hazardous environments.



Interior parts in airplanes, automobiles, and railways with excellent surface finish



Protective and internal consumer or medical electronics components

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Custom jigs, fixtures, and replacement parts for industrial environments with high temperatures or ignition sources

Material Variants | 3D Printer Compatibility

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Flame Retardant V1, 1L

Compatible with Form 4 

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Flame Retardant Resin, 1L

Compatible with Form 3 Series

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Material Safety Datasheets

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Post Processing



10 minutes IPA or 15 minutes in TPM


If washing with TPM, use a quick water rinse after to ensure complete removal of TPM.

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60 minutes                         70 °C


  • To achieve the highest HDT of 111 °C @ 0.45 MPa: Post-cure parts in Form Cure for 120 min at 80 °C.
  • For applications that do not require the maximum heat resistance but offer more toughness, post-cure parts in Form Cure for 60 min at 70 °C.


Technical Specifications*



Post-Cured 70 °C 60 m

Post-Cured 80 °C 120 m

Ultimate Tensile Strength
24 MPa 38 MPa 41 MPa    
Tensile Modulus
1.8 GPa 2.9 GPa 3.1 GPa    
Elongation at Break
20% 9.4% 7.1%    
Flexural Strength
36 MPa 72 MPa 75 MPa    
Flexural Modulus
1.3 GPa 2.7 GPa 2.7 GPa    
Notched Izod
19 J/m 22 J/m 22 J/m    
Unnotched Izod
227 J/m 241 J/m 257 J/m    
Work of Fracture (Wf)
N/A 311 J/m2 277 J/m2    
Heat Deflection Temp. @ 1.8 MPa
45 °C 71 °C 83 °C    
Heat Deflection Temp. @ 0.45 MPa
55 °C 94 °C 111 °C    
Glass Transition Temperature (Tg)
101 °C 130 °C 144 °C    
Hardness, Shore D
80D (post-cured)
Viscosity (25 °C)
4500 - 5000 cP        
Flammability, Smoke Toxicity and Gas Toxicity
See Results        

*Material properties may vary based on part geometry, print orientation, print settings, temperature, and disinfection or sterilization methods used. Data for tensile samples were measured on Type I tensile bars printed on a Form 3+ printer with 100 µm Flame Retardant Resin settings, washed in a Form Wash for 10 minutes in ≥99% Isopropyl Alcohol, and post-cured at 70°C for 60 minutes or 80°C for 120 minutes in a Form Cure.