Fire-Retardant Resin FR-ESD
Flame-retardant grade
also Flame Retardant Resin
FR-ESD = flame-retardant + static-dissipative
For electronics assembly fixtures, trays and covers that must be both V-0 and static-dissipative.
Values for the FR-ESD condition
Other Fire-Retardant Resin grades and fills
Fire-Retardant Resin is listed in 8 conditions; see the grade overview at Fire-Retardant Resin.
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 |
FR-ESDThis page 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 FR-ESD?
Fire-Retardant Resin FR-ESD is Fire-Retardant Resin in the FR-ESD grade — for electronics assembly fixtures, trays and covers that must be both V-0 and static-dissipative. Fire-Retardant Resin FR-ESD has a tensile strength of 55 MPa (7.98 ksi), stronger than 61% of polymer grades. Elongation at break is 3% and the elastic modulus is 3.2 GPa (0.464 Msi). Fire-Retardant Resin FR-ESD has a density of 1.38 g/cm³ (0.0499 lb/in³), heavier than 77% of polymer grades. Its glass-transition temperature is 100°C (212 °F). FR-V0 is the default condition FabDigit quotes; FR-ESD is available on request or by drawing note.
Advantages
- Conducts heat well — 0.3 W/m·K (0.173 BTU/hr·ft·°F), better than 83% of polymer grades
- Stiff — 3.2 GPa (0.464 Msi), better than 77% of polymer grades
Limitations
- Limited ductility — 3%, worse than 83% of polymer grades
- Difficult to machine — 45/100, worse than 78% of polymer grades
- Heavy — 1.38 g/cm³ (0.0499 lb/in³), worse than 77% of polymer grades
- Absorbs moisture — dry before molding — 0.6%, worse than 75% of polymer grades
Fire-Retardant Resin FR-ESD properties
Typical room-temperature values for Fire-Retardant Resin FR-ESD; 25 are specific to this condition. Other listed values are Fire-Retardant Resin reference data and may not represent this condition. Bars are the position among polymer grades.
Physical4
Fire-Retardant Resin FR-ESD has a density of 1.38 g/cm³ (0.0499 lb/in³), heavier than 77% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical11
Fire-Retardant Resin FR-ESD has a tensile strength of 55 MPa (7.98 ksi), stronger than 61% of polymer grades. Elongation at break is 3% and the elastic modulus is 3.2 GPa (0.464 Msi).
Thermal10
Fire-Retardant Resin FR-ESD is rated for continuous service to 90°C (194 °F). It conducts heat at 0.3 W/m·K (0.173 BTU/hr·ft·°F), better than 83% of polymer grades. Thermal expansion is 75 µm/m·K (41.7 µin/in·°F).
Electrical6
Fire-Retardant Resin FR-ESD is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 70% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of Fire-Retardant Resin FR-ESD 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 FR-ESD's machinability is fair (45/100, worse than 78% of polymer grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Fire-Retardant Resin FR-ESD
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.
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.
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 |
Fire-Retardant Resin FR-ESD — frequently asked
What is Fire-Retardant Resin FR-ESD used for?
Fire-Retardant Resin FR-ESD 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 FR-ESD?
Fire-Retardant Resin FR-ESD has a typical tensile strength of 55 MPa (7.98 ksi) — stronger than 61% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is Fire-Retardant Resin FR-ESD 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 FR-ESD 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 FR-ESD?
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 FR-ESD 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 FR-ESD?
Fire-Retardant Resin FR-ESD is rated for continuous use to about 90°C (194 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.