Flame Retardant Resin is a self-extinguishing and halogen-free material that performs well in environments with high temperatures or ignition sources. Use this resin to produce parts that can handle additional post-fabrication operations such as tapping, trimming, and drilling. Parts can undergo optional post-processing steps such as painting or electroplating.

Flame Retardant Resin is UL94 V-0 and FAR25.853 certified. Use it to produce airplane, automobile, and railway interior parts, protective and internal consumer electronics components, and custom jigs, fixtures, and replacement parts for industrial environments.

Recommended for:

• Interior parts in airplanes, automobiles, and railways
• Protective and internal consumer electronics components
• Custom jigs, fixtures, and replacement parts

Flame Retardant Resin prints at 50 microns and 100 microns on the Form 3 series of printers and at 100 microns on the Form 3L series of printers.

To learn more about the performance properties of Formlabs resins, refer to the library of material properties data sheets.

Shake the resin cartridge vigorously while rotating for at least two minutes before starting a print with Flame Retardant Resin. Insufficient mixing may affect the flame retardant properties of printed parts. If it has been more than two weeks since you printed with Flame Retardant Resin, shake the cartridge for two minutes and stir the resin in the tank before printing.

Due to the viscosity of Flame Retardant Resin, Formlabs recommends priming a new resin tank to reduce print time and avoid tank fill error messages.

Install or update PreForm, then set up the next print job.

To prepare a model for printing in PreForm:

1. Open a model.
2. Select the resin, resin version, and the desired layer thickness.
3. Orient to preserve fine details.
4. Generate supports.
5. Send the print job to the printer.

The Form Wash agitates the solvent bath and removes parts from the bath after a set time. Wash parts according to the support article Form Wash time settings. Pay particular attention to information that affects mechanical properties.

Small negative features may be difficult to fully clean due to the resin’s high viscosity. If the model is hollow or has internal channels, ensure liquid resin is flushed out thoroughly from these features using a skirt bottle filled with 99% isopropyl alcohol (IPA). Use compressed air to allow parts to fully dry before post-curing.

Flame Retardant Resin requires post-curing to reach its optimal mechanical properties. For tall thin parts or for parts with large overhangs, Formlabs recommends post-curing with supports to prevent warping or sagging.

Refer to the support article Form Cure time and temperature settings for post-curing recommendations.

After post-curing, use 600-grit sandpaper to remove support marks and scratches. A lower grit sandpaper may abrade the surface. You may also wish to use the Formlabs Finishing Tools kit.