Rigid Resin · grade
Rigid Resin Unfilled
Properties of the Unfilled condition, compared with the other Rigid Resin grades.
Use for general prototypes and visual models where high stiffness is not required and better ductility/surface finish matters.
What is Rigid Resin Unfilled?
Rigid Resin Unfilled is Rigid Resin in the Unfilled grade — use for general prototypes and visual models where high stiffness is not required and better ductility/surface finish matters. Rigid Resin Unfilled has a tensile strength of 65 MPa (9.43 ksi), stronger than 72% of polymer grades. Elongation at break is 6.2% and the elastic modulus is 2.8 GPa (0.406 Msi). Rigid Resin Unfilled has a density of 1.18 g/cm³ (0.0426 lb/in³), heavier than 50% of polymer grades. Its glass-transition temperature is 105°C (221 °F). Glass Filled is the default condition FabDigit quotes; Unfilled is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 70/100, better than 78% of polymer grades
Limitations
- Limited formability — 3/100, worse than 99% of polymer grades
- Difficult to weld — 3/100, worse than 95% of polymer grades
- Low fracture toughness — 0.9 MPa·√m (0.819 ksi·√in), worse than 89% of polymer grades
- Limited service temperature — 65°C (149 °F), worse than 83% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
Rigid Resin Unfilled properties
Typical room-temperature values for Rigid Resin Unfilled — 15 properties are specific to this condition; the rest are grade-level values shared by every Rigid Resin grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical3
Rigid Resin Unfilled has a density of 1.18 g/cm³ (0.0426 lb/in³), heavier than 50% of polymer grades. Its glass-transition temperature is 105°C (221 °F).
Mechanical12
Rigid Resin Unfilled has a tensile strength of 65 MPa (9.43 ksi), stronger than 72% of polymer grades. Elongation at break is 6.2% and the elastic modulus is 2.8 GPa (0.406 Msi).
Thermal10
Rigid Resin Unfilled is rated for continuous service to 65°C (149 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 56% of polymer grades. Thermal expansion is 85 µm/m·K (47.2 µin/in·°F).
Electrical6
Rigid Resin Unfilled is an electrical insulator with a dielectric strength of 15 kV/mm (381 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 55% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of Rigid Resin Unfilled takes about 115 MJ of energy and emits 6 kg of CO₂ — more than 70% of polymer grades. Typical recycled content is 0%.
Manufacturability4
Rigid Resin Unfilled's machinability is good (55/100, worse than 63% of polymer grades); weldability not recommended (3/100); formability not recommended (3/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Rigid Resin grades and fills
Rigid Resin is also supplied in 8 other conditions. The full side-by-side table is on the Rigid Resin overview.
- Glass FilledDefaultDefault choice for stiff, dimensionally stable printed parts: thin walls, jigs, housings and fluid-flow models.75 MPa tensile
- Rigid 10KHighest stiffness and heat resistance in the family — thin-wall turbines, ducting, mould inserts and short-run injection tooling.82 MPa tensile
- Rigid 4000Pick when you need stiffness plus a little more toughness than the 10 GPa grade — jigs, fixtures, snap-in housings.69 MPa tensile
- UnfilledUse for general prototypes and visual models where high stiffness is not required and better ductility/surface finish matters.65 MPa tensile
- FR V-0Specify for aerospace-interior, rail and electrical enclosures where UL 94 V-0 at 3 mm is mandatory.55 MPa tensile
- High TempChoose for hot-air/hot-fluid rigs, mould and lost-wax patterns needing HDT well above 200 °C, accepting very low ductility.52 MPa tensile
- ESDUse for electronics assembly jigs, trays and nests where surface resistivity must sit in the dissipative window.50 MPa tensile
Working with Rigid Resin Unfilled
Is Rigid Resin easy to machine?
Drilling, tapping and light milling are possible but the part is brittle and the glass filler is abrasive — use sharp carbide tools, low feed, no coolant soak, and extract the dust (respirator required).
Can Rigid Resin be welded?
Thermoset: cannot be welded or reflowed; join with cyanoacrylate, two-part epoxy or UV-cure adhesive, and screw into heat-set/threaded inserts rather than tapped resin.
Can Rigid Resin be formed, bent or molded?
Printed on SLA/DLP/LCD at 385–405 nm with a heated (30–35 °C) tank; shake/stir the cartridge because glass filler settles, then IPA wash 5–10 min, dry, and post-cure under UV at 60–80 °C per producer schedule to reach datasheet properties.
What surface finishes work on Rigid Resin?
Sands and primes well; bead-blast or 400–800 grit for a uniform matte, then use a UV-blocking primer/topcoat since bare photopolymer yellows and embrittles outdoors — electroplating requires a conductive base coat.
Rigid 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 |
|---|---|---|
| acrylate/methacrylate reactive diluent mcontrols viscosity and cure shrinkage | 10 – 40 | 22 |
| glass fiber / glass microspheressilane-treated; ~15–25% in Rigid 4000-class, ~40–50% in Rigid 10K-class | 10 – 55 | 35 |
| photoinitiator (acylphosphine oxide type385/405 nm absorption | 0.5 – 3 | 1.5 |
| pigment, UV blocker, stabilizer, disperscontrols cure depth and shelf life | 0.2 – 3 | 1 |
| urethane/epoxy acrylate–methacrylate olicrosslinking backbone; exact chemistry proprietary | ≥ 25 (balance) | — |
Rigid Resin Unfilled — frequently asked
What is Rigid Resin Unfilled used for?
Rigid Resin Unfilled is typically used for engineering prototypes with thin walls, jigs and locating fixtures, brackets and mounting plates, low-volume mould and tooling inserts, ducting and manifold prototypes and heat-exposed under-hood test parts. In short: stiff glass-filled resin.
What is the tensile strength of Rigid Resin Unfilled?
Rigid Resin Unfilled has a typical tensile strength of 65 MPa (9.43 ksi) — stronger than 72% of polymer grades. Strength varies by condition: see the 9 listed tempers.
Is Rigid Resin Unfilled easy to machine?
Reasonably — machinability is rated good (55/100, worse than 63% of polymer grades). Drilling, tapping and light milling are possible but the part is brittle and the glass filler is abrasive — use sharp carbide tools, low feed, no coolant soak, and extract the dust (respirator required).
Can Rigid Resin Unfilled be welded?
Not readily — weldability is rated not recommended (3/100). Thermoset: cannot be welded or reflowed; join with cyanoacrylate, two-part epoxy or UV-cure adhesive, and screw into heat-set/threaded inserts rather than tapped resin.
What surface finishes work on Rigid Resin Unfilled?
Sands and primes well; bead-blast or 400–800 grit for a uniform matte, then use a UV-blocking primer/topcoat since bare photopolymer yellows and embrittles outdoors — electroplating requires a conductive base coat.
Can Rigid Resin Unfilled be formed, bent or molded?
Printed on SLA/DLP/LCD at 385–405 nm with a heated (30–35 °C) tank; shake/stir the cartridge because glass filler settles, then IPA wash 5–10 min, dry, and post-cure under UV at 60–80 °C per producer schedule to reach datasheet properties.
What is the maximum service temperature of Rigid Resin Unfilled?
Rigid Resin Unfilled is rated for continuous use to about 65°C (149 °F), and briefly to 150°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Rigid Resin Unfilled?
Yes — Rigid Resin Unfilled is available for injection molding and 3D printing with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Rigid 10K Resin — Technical Data Sheet — Formlabs (2023)
- Rigid 4000 Resin — Technical Data Sheet — Formlabs (2023)
- High Temp Resin V2 / Flame Retardant Resin / ESD Resin data sheets — Formlabs (2023)
- Loctite 3D IND & MED photopolymer resin data sheets — Henkel (2022)
- ASTM D638 / D790 / D256 / D648 / D570 test methods — ASTM International (2022)
- UL 94 Standard for Tests for Flammability of Plastic Materials — UL Solutions (2021)
- Engineering Plastics (Engineered Materials Handbook Vol. 2) — thermoset acrylates — ASM International (1988)
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.