Formlabs Formlabs Flame Retardant Resin (Form 4)

Formlabs Flame Retardant Resin (Form 4) 1 L

Flame Retardant Resin is a specialty UL 94 Blue Card certified material designed for the production of self-extinguishing and halogen-free parts. This resin offers excellent flame, smoke, and toxicity (FST) ratings, making it a reliable choice for long-term use in indoor and industrial environments with high temperatures or potential ignition sources.

This 1-litre cartridge is optimised for the Form 4 ecosystem, delivering stiff, heat-resistant, and creep-resistant components with an exceptional surface finish that rivals injection moulding. It provides the design freedom of 3D printing while meeting strict safety certifications for regulated industries.

Why choose Flame Retardant Resin?

Accelerate time to market without the design constraints and upfront costs of traditional manufacturing with isotropic and highly detailed parts (XY resolution: 25 μm) with unlimited geometric freedom in any quantity at any time.

• Certified safety: UL 94 V-0 (at 3 mm) and FAR 25.853 Appendix F certified, meeting critical flammability requirements for hazardous environments.
• Heat and creep resistance: maintains mechanical stability and performance over time in high-temperature industrial settings.
• Stiff and functional: with a 3.1 GPa tensile modulus, parts are strong enough for post-processing operations such as tapping, drilling, and trimming.
• Injection-moulded quality: produces high-detail parts with a smooth surface finish far superior to traditional FDM methods.
• Halogen-free: safe for use in environments where halogen-free materials are mandatory to reduce toxic gas emission during combustion.

Applications for Flame Retardant Resin:

Flame Retardant (FR) resin is a cost and time-effective solution for fabricating self-extinguishing parts.

• Transportation: interior components for aircraft, automobiles, and railway systems requiring FST certification.
• Electronics: protective housings and internal components for consumer or medical electronics.
• Industrial tooling: custom jigs, fixtures, and replacement parts for high-heat manufacturing environments.
• Aviation: FAR-rated parts and functional prototypes for aerospace engineering.

Post-processing

Washing

The foundational step in any SLA post-processing workflow is to remove any excess resin on the surface of the parts through an alcohol or ether wash.

Curing

Post-curing engineering and specialty resins is essential for parts to achieve their full strength and functionality. This step completes the chemical reaction initiated during printing, transforming the part from its green state into a fully finished component.

Note: Only compatible with the Formlabs Form 4 series resin printer.

Technical file & User tips