Formlabs Flame Retardant Resin

Flame Retardant Resin 1L

Flame Retardant Resin is a specialty material certified with a UL 94 Blue Card, ideal for producing self-extinguishing, halogen-free parts with excellent flame, smoke, and toxicity (FST) ratings.

Easily 3D print flame-retardant, heat-resistant, rigid, and creep-resistant parts designed to perform well in high-temperature or fire-prone indoor and industrial environments. Testing and certifications include: UL 94 V-0 at 3 mm thickness; FAR 25.853 Appendix F, Part I for flammability; and ASTM E662 for FST. See the technical datasheet for full testing details and certifications.

*If in stock, delivery within 3 days after ordering. If out of stock, shipment will be made within 3 days after restocking.

Flame Retardant Resin is designed for industries like transportation, aerospace, manufacturing, electronics, medical, and aviation. It enables new applications for customers with strict regulatory workflows, including:

• Low-volume production parts for aerospace, aviation, automotive, and medical environments
• Tooling and manufacturing aids for high-temperature or ignition-prone settings
• Electronic enclosures, connector housings, and covers
• High-power electrical applications (e.g., transformer bobbins and relays)
• Maintenance, Repair, and Overhaul (MRO) applications

Users can now take advantage of 3D printing’s speed and design freedom while maintaining compliance. Formlabs’ robust SLA technology combined with Flame Retardant Resin offers an end-to-end solution for designing and producing UL 94-rated parts.

Why Choose Flame Retardant 3D Printing?

Combining the Best of Traditional and 3D Printing Workflows

For manufacturers in aerospace, electronics, medical devices, and transportation, flame-retardant parts have long been essential. These sectors often deal with sparks, ethers, or other fuel sources, demanding strict regulation for workplace and product safety. UL 94 is the gold standard certification for plastic flammability, measuring whether materials extinguish or propagate flame upon ignition.

Formlabs Flame Retardant Resin meets UL 94 V-0 Blue Card standards and passes FAR 25.853(a) flammability, smoke, and toxicity tests. It’s designed to handle hazardous environments involving open flame or high heat.

▲ The resin self-extinguishes once the flame source is removed.

Traditionally, plastics meeting these standards were machined, injection-molded, or cast—processes requiring expensive equipment and labor-intensive steps. Outsourcing could mean long lead times and high costs. In-house options like casting involve multi-step processes based on machined or printed masters.

Some 3D printing materials offer flame resistance, but with trade-offs. FDM flame-retardant filaments are often unsuitable for functional testing or customer-facing end-use parts. While SLA historically offered heat-resistant resins, they lacked UL 94 certification.

▲ Light gray flame retardant resin parts can be drilled, tapped, and post-processed, making them ideal for functional assemblies.

Flame Retardant Resin bridges these gaps with SLA strength and certified safety. After post-curing at 80°C for 120 minutes, parts exhibit a heat deflection temperature (HDT) of 111°C @ 0.45 MPa and a tensile modulus of 3.1 GPa. Unlike some brittle high-temp materials, this resin resists creep and handles threads and tapping. It features a smooth, matte surface with crisp lines and dimensional accuracy, superior to most FDM prints.