What is SLA flame-retardant resin?
It's an SLA resin rated UL94 V-0 at 3 mm — self-extinguishing when the flame source is removed, without dripping flaming particles. It is halogen-free, holds a 111 °C heat deflection temperature, and is additionally tested to FAR 25.853 and ASTM E662. RYSE 3D prints it on the Formlabs Form 4L for fine-detail fire-rated enclosures, covers and housings.
What does UL94 V-0 mean?
UL 94 is a plastics flammability standard, and V-0 is the strictest of its vertical burn classifications. A V-0 material stops burning within ten seconds after the flame is removed and does not drip flaming particles that would ignite cotton beneath the specimen. The classification is always tied to a thickness — ours is established at 3 mm.
Is a UL94 V-0 rated part automatically certified?
No, and this is the point worth being clear on. The rating is established on standard test specimens at a defined thickness. It describes the material. Whether your finished part carries that rating depends on its wall thickness and on what your application's approval process requires. Tell us at quote what the part has to satisfy and we'll confirm what documentation is available before you commit.
What is flame-retardant resin used for?
Flame-rated enclosures, electrical housings, rail interior covers, aerospace covers, battery-adjacent parts, connector covers, cable management and control-box housings — plus fire-rated prototypes where the rating has to be present from the first sample rather than added later.
Can you 3D print UL94 V-0 rated parts in the UK?
Yes. We print, finish and inspect flame-retardant resin parts in-house in Shipston-on-Stour, Warwickshire, and ship UK-wide. Send the CAD, tell us the wall thickness that has to carry the rating and what your approval process needs, and we'll confirm it with your quote.
How strong and heat-resistant is flame-retardant resin?
38 MPa ultimate tensile strength with 9.4% elongation at break, and a 111 °C heat deflection temperature. That is rigid and usefully ductile — right for fitted covers and working enclosures sitting next to warm electronics, but not a high-temperature or high-impact material.
Is the resin halogen-free?
Yes — the flame retardancy is achieved without halogenated additives, which matters where restricted-substance policies apply. It has also been tested to ASTM E662 for smoke generation and FAR 25.853 Appendix F Part I for aircraft interior flammability, so the flame, smoke and toxicity picture is documented.
Should I choose SLA Flame-Retardant or FDM PC-FR?
Choose on size and finish. SLA Flame-Retardant gives a smoother surface, finer detail and additional FAR 25.853 and ASTM E662 testing, within a 353 × 196 × 350 mm envelope. FDM PC-FR prints one-piece parts up to 500 × 500 × 900 mm, is stronger at 60 MPa and holds more heat at 125 °C, but its rating sits at 1.5 mm on the base resin and its surface shows layer lines. Send the CAD and the requirement and we'll recommend one.
What machine do you print SLA on?
The Formlabs Form 4L, with a 353 × 196 × 350 mm build envelope, running in open mode so we are not tied to one supplier's resin range. Parts are laid out and supported in PreForm, washed on the Form Wash L and post-cured on the Form Cure L, then supports are removed and the part finished by hand — all in-house in Shipston-on-Stour.
How do I order flame-retardant resin parts in the UK?
Upload your CAD to our instant online quote and select SLA Flame-Retardant. As a UK 3D printing service bureau we print, finish and inspect every part in-house in Shipston-on-Stour, Warwickshire, and ship UK-wide — from a single fire-rated prototype to a production batch of enclosures.
