Fire-Retardant Resin
also Flame Retardant Resin
Fire-Retardant Resin is an SLA/DLP photopolymer modified with halogenated or phosphorus-based flame retardants to pass UL94 V-0, offered as FR-V0, FR-V0-1.5 (1.5 mm rating), glass-filled FR-GF, tough, ESD and high-temperature variants.
Reference datasheet — Fire-Retardant Resin is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the FR-V0 condition
Fire-Retardant Resin grades and fills
Fire-Retardant Resin is supplied in 8 conditions, soft to hard. FR-V0 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
As-printed | Reference state only — never use for fire-rated parts; UV/thermal post-cure is required to reach V-0 and datasheet mechanicals. | 25 | 30 | 10 | 72 Shore D |
impact-modified flame-retardant | Choose for snap fits, clips and drop-tested enclosures that still need a V-0 rating; trades HDT and stiffness for toughness. | 45 | 15 | 78 Shore D | |
Flame-retardant + static-dissipative | For electronics assembly fixtures, trays and covers that must be both V-0 and static-dissipative. | 50 | 55 | 3 | 84 Shore D |
FR-V0 thin-wall | Specify when the finished part has walls under 3 mm and the UL Yellow Card rating must cover that thickness. | 52 | 55 | 2.5 | 87 Shore D |
Brominated (halogenated) flame-retardant formulation | Pick when the easiest, most robust V-0 rating is needed and halogen-free/RoHS-style restrictions do not apply. | 55 | 58 | 3 | 86 Shore D |
FR-V0Default Halogen-free (phosphorus) flame-retardant, fully post-cured | Default choice for RoHS/halogen-free electronic enclosures and jigs that must show UL 94 V-0 at 3 mm. | 60 | 4 | 85 Shore D | |
High-temperature flame-retardant | For under-hood, lighting and near-heat-source FR parts needing HDT well above 120 °C after thermal post-cure. | 60 | 1.8 | ||
Glass/mineral-filled flame-retardant | Use for rigid, dimensionally stable FR housings, ducting and tooling where stiffness and heat resistance matter more than toughness. | 62 | 1.5 | 88 Shore D |
What is Fire-Retardant Resin?
Fire-Retardant Resin is an SLA/DLP photopolymer modified with halogenated or phosphorus-based flame retardants to pass UL94 V-0, offered as FR-V0, FR-V0-1.5 (1.5 mm rating), glass-filled FR-GF, tough, ESD and high-temperature variants. Engineers specify it for printed enclosures and interior components that must satisfy fire-safety codes, with 60 MPa tensile strength, 4 % elongation, 3.3 GPa modulus, 85 Shore D and 1.32 g/cm³ density. Service temperature reaches 100 °C, the highest in this resin set, but the filled matrix is brittle and abrasive (machinability score 45) and the V-0 rating depends on complete post-cure and on wall thickness. Where no flame rating is required, a standard tough resin is cheaper and less brittle. Fire-Retardant Resin has a density of 1.32 g/cm³ (0.0477 lb/in³), heavier than 72% of polymer grades. Its glass-transition temperature is 100°C (212 °F). Fire-Retardant Resin has a tensile strength of 60 MPa (8.7 ksi), stronger than 68% of polymer grades. Elongation at break is 4% and the elastic modulus is 3.3 GPa (0.479 Msi).
What is Fire-Retardant Resin used for?
- electrical enclosures
- aerospace interior mockups
- rail/transit component prototypes
Advantages
- Stiff — 3.3 GPa (0.479 Msi), better than 80% of polymer grades
Limitations
- Limited ductility — 4%, worse than 78% of polymer grades
- Difficult to machine — 45/100, worse than 78% of polymer grades
- Absorbs moisture — dry before molding — 0.6%, worse than 75% of polymer grades
Fire-Retardant Resin properties
Typical room-temperature values for Fire-Retardant Resin-FR-V0; bars are the position among polymer grades.
Physical4
Fire-Retardant Resin has a density of 1.32 g/cm³ (0.0477 lb/in³), heavier than 72% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical11
Fire-Retardant Resin has a tensile strength of 60 MPa (8.7 ksi), stronger than 68% of polymer grades. Elongation at break is 4% and the elastic modulus is 3.3 GPa (0.479 Msi).
Thermal10
Fire-Retardant Resin is rated for continuous service to 100°C (212 °F). It conducts heat at 0.22 W/m·K (0.127 BTU/hr·ft·°F), better than 60% of polymer grades. Thermal expansion is 75 µm/m·K (41.7 µin/in·°F).
Electrical6
Fire-Retardant Resin is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (75/100), worse than 66% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of Fire-Retardant Resin takes about 115 MJ of energy and emits 5.5 kg of CO₂ — more than 70% of polymer grades. Typical recycled content is 0%.
Manufacturability2
Fire-Retardant Resin's machinability is fair (45/100, worse than 78% of polymer grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. Fire-Retardant Resin is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Fire-Retardant Resin
Is Fire-Retardant Resin easy to machine?
Drills, taps and sands cleanly but is brittle and the mineral/FR filler is abrasive — use sharp carbide, light feeds, back the part up to stop chipping, and wear a mask for the dust.
Can Fire-Retardant Resin be welded?
Thermoset and unweldable; join with cyanoacrylate/2K epoxy or heat-staked/threaded inserts, and keep adhesives inside the rated wall thickness so the FR rating still holds.
Can Fire-Retardant Resin be formed, bent or molded?
Print at 385/405 nm with warmed (30–35 °C), well-stirred resin because the filler settles; expect 1–2 % cure shrinkage, then wash in IPA and give a full UV + thermal post-cure since the V-0 rating and HDT depend on complete conversion.
Fire-Retardant Resin chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| urethane acrylate / epoxy acrylate oligonetwork backbone | 30 – 55 | 40 |
| acrylate reactive diluent monomersviscosity control, crosslink density | 15 – 35 | 25 |
| phosphorus flame retardant (phosphate/phhalogen-free char-forming FR; replaced by brominated acrylate in FR-BR | 5 – 20 | 12 |
| aluminium trihydroxide / mineral fillerendothermic water release, smoke suppression | 10 – 35 | 20 |
| photoinitiator (acylphosphine oxide type385/405 nm absorption | 0.5 – 3 | 1.5 |
| pigment, dispersants, UV blocker, stabilgrey/black pigment aids UL rating repeatability | 0.5 – 4 | 1.5 |
What surface finishes work on Fire-Retardant Resin?
Bead-blast or sand to a satin finish; the filled matrix will not polish to clarity, and any paint, primer or conformal coating must itself be fire-rated or the assembly loses its UL classification.
Equivalent designations
Standards and trade names that resolve to Fire-Retardant Resin in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Flame Retardant Resin
- Similar grades
- UL94 V0
How much does Fire-Retardant Resin cost?
Fire-Retardant Resin is a high-cost polymer ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Fire-Retardant Resin — frequently asked
What is Fire-Retardant Resin used for?
Fire-Retardant Resin is typically used for electrical enclosures, aerospace interior mockups and rail/transit component prototypes. In short: UL94 V-0 printable resin; 100 °C service temperature; filled, brittle, abrasive.
What is the tensile strength of Fire-Retardant Resin?
Fire-Retardant Resin has a typical tensile strength of 60 MPa (8.7 ksi) — stronger than 68% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is Fire-Retardant Resin easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 78% of polymer grades). Drills, taps and sands cleanly but is brittle and the mineral/FR filler is abrasive — use sharp carbide, light feeds, back the part up to stop chipping, and wear a mask for the dust.
Can Fire-Retardant Resin be welded?
Thermoset and unweldable; join with cyanoacrylate/2K epoxy or heat-staked/threaded inserts, and keep adhesives inside the rated wall thickness so the FR rating still holds.
What surface finishes work on Fire-Retardant Resin?
Bead-blast or sand to a satin finish; the filled matrix will not polish to clarity, and any paint, primer or conformal coating must itself be fire-rated or the assembly loses its UL classification.
Can Fire-Retardant Resin be formed, bent or molded?
Print at 385/405 nm with warmed (30–35 °C), well-stirred resin because the filler settles; expect 1–2 % cure shrinkage, then wash in IPA and give a full UV + thermal post-cure since the V-0 rating and HDT depend on complete conversion.
What is the maximum service temperature of Fire-Retardant Resin?
Fire-Retardant Resin is rated for continuous use to about 100°C (212 °F), and briefly to 130°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Fire-Retardant Resin FR-V0 and Fire-Retardant Resin FR-BR?
FR-V0 is the default condition — default choice for RoHS/halogen-free electronic enclosures and jigs that must show UL 94 V-0 at 3 mm. FR-BR: pick when the easiest, most robust V-0 rating is needed and halogen-free/RoHS-style restrictions do not apply.
How much does Fire-Retardant Resin cost?
Fire-Retardant Resin is a high-cost polymer ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- UL 94 — Tests for Flammability of Plastic Materials for Parts in Devices and Appliances — UL Solutions (2023)
- ISO 4589-2 — Determination of burning behaviour by oxygen index — ISO (2017)
- ASTM D638 / D790 / D256 / D648 — tensile, flexural, impact, HDT of plastics — ASTM International (2022)
- Flame Retardant Resin technical data sheet (SLA/LFD photopolymer) — Formlabs (2023)
- Somos / Loctite 3D flame-retardant photopolymer data sheets — Stratasys (Somos) / Henkel (2023)
- Photopolymer property compilations (cured acrylate networks) — CAMPUS / UL Prospector (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.