| HS Code | 668763 |
| Tensile Strength | 36 MPa (5200 psi) |
| Tensile Modulus | 1900 MPa (275 ksi) |
| Elongation At Break | 13% |
| Flexural Strength | 58 MPa (8400 psi) |
| Flexural Modulus | 2100 MPa (305 ksi) |
| Izod Impact Strength Notched | 40 J/m (0.75 ft-lb/in) |
| Hardness Shore D | 80 |
| Density | 1.13 g/cm³ |
| Heat Deflection Temperature 0 45 Mpa | 70 °C (158 °F) |
| Glass Transition Temperature | 85 °C (185 °F) |
| Flammability Rating | UL 94 V-0 |
| Dielectric Strength | 15.7 kV/mm (400 V/mil) |
| Dielectric Constant 1 Mhz | 3.5 |
| Volume Resistivity | 10^14 ohm-cm |
| Water Absorption | 0.3% |
As an accredited 3D Systems QuickPlastic Cast Urethane Material 94V0 Polypropylene Like factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
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Low-volume electrical junction boxes and terminal enclosures require a flame-retardant housing material that can be cast without steel tooling. The QuickPlastic cast urethane is processed in a silicone mold under vacuum; the two liquid components are degassed separately at −0.095 MPa to −0.10 MPa before being combined at the supplier's fixed weight ratio. Lot-specific ratio drift beyond ±0.5 wt% on the isocyanate side leaves residual unreacted polyol, which reduces surface hardness and can allow the phosphorus-based flame-retardant package to migrate to the cavity surface. The mixed resin is poured into a silicone tool preheated to 30–40 °C, then cured at ambient pressure for the gel phase and post-cured per the manufacturer's schedule. For terminal blocks and junction boxes, the end-use wall must be held at or above the thickness at which UL 94 V-0 is certified; cutouts for cable glands and knockouts must be tested separately because thin webs below the certified thickness often drop to V-1. Compliance should be verified against IEC 60695-11-10 for the same thickness and specimen orientation used in the enclosure, and the final assembly is rated under IEC 60529 only after gasket compression is validated on the cast surface. A common production defect observed on vacuum-cast electrical enclosures is air entrapment at the base of threaded inserts; this is controlled by slow stirring after pigment addition and by drawing the filled mold under vacuum for 60–90 s after pour, not by increasing resin temperature, which shortens working time. Terminal products include IP65 junction boxes, DIN-rail terminal covers, and low-voltage transformer housings.
The shift from molded semi-crystalline polypropylene to a cast PP-like urethane changes the part’s post-mold shrinkage behavior and therefore snap-fit interference. Mold shrinkage for this class of cast urethane is typically lower than that of molded polypropylene; published tool compensation factors for rigid cast urethanes fall between 0.2% and 0.8%, while unfilled injection-molded polypropylene commonly shrinks between 1.0% and 2.0%. For an underhood wiring bracket, the tool insert for the latch feature must be machined larger than the nominal CAD dimension by the measured shrinkage of the specific lot, otherwise the clip engages with lower retention force or fractures the latch root during insertion. The two components are metered by weight on a balance with 0.01 g readability; degassing is performed at −0.095 MPa until visible bubbling ceases, typically 5–8 min per component. After mixing, the material is poured into a silicone mold preheated to 35–40 °C, which lowers viscosity enough to fill thin clip arms without accelerating gelation beyond the working time. Flame-retardant certification is UL 94 V-0 at the certified thickness; however, V-0 alone does not imply compliance with FMVSS 302 for interior materials, and the two tests differ in specimen orientation and ignition source. Underhood clips should be validated for heat aging at the expected continuous air temperature, because cast urethane softens at a lower temperature than glass-filled PP and may lose clamp force over 500–1000 h at service temperature. Terminal products include wiring harness clips, sensor brackets, and ECU housing covers.
For short-run medical diagnostic cart housings, the first evaluation is not flame rating but chemical resistance to quaternary ammonium disinfectants and alcohol-based surface cleaners. The cast urethane components are mixed at the manufacturer’s published weight ratio; preheating both components to 25–30 °C reduces viscosity and allows the flame-retardant filler to remain suspended during degassing at −0.095 MPa. Off-ratio mixing beyond ±0.5 wt% produces a softer polyurethane network with lower crosslink density, which increases the diffusion rate of disinfectant into the surface and can result in gloss loss, microcracking, or flame-retardant extraction after repeated wiping. The material carries UL 94 V-0 at the certified thickness, but medical electrical equipment requires the final enclosure to meet the flammability clauses of IEC 60601-1, not merely the resin supplier’s certificate. Biocompatibility is not established for this grade; use is limited to non-patient-contact housings, monitor bezels, cart panels, and protective covers that are not in contact with broken skin or mucosal surfaces. For wipe-down testing, chemical resistance is evaluated by immersion or saturated wipe exposure under the disinfectant concentration used by the hospital, typically 70% isopropanol or 0.5–1.0% quaternary ammonium solution, followed by visual inspection and hardness measurement per ASTM D2240. Terminal products include diagnostic cart enclosures, ultrasound monitor bezels, and mobile workstation panels.
Double-walled power tool housings expose the cast urethane to both motor winding heat and drop-induced tensile stress at thin ribs. Published comparative data for this specific formulation in double-walled tool shells is limited; therefore the end-use engineering validation must include ASTM D648 heat deflection temperature at the maximum motor compartment air temperature and ASTM D256 Izod impact at the lowest specified storage temperature. The UL 94 V-0 classification is thickness-dependent: a 3.0 mm wall may pass V-0 while a 1.5 mm rib tip or snap-fit beam may only achieve V-1 or V-2, so thin features that serve as fire enclosure boundaries must be tested as molded, not inferred from flat plaque data. During vacuum casting, the silicone tool is degassed before the mixed resin is introduced; the resin is poured slowly along an inclined tool wall to prevent folded air from collecting at the joint between the inner and outer shell. Mix ratio is fixed by supplier datasheet; weighing tolerance is maintained at ±0.5 wt% on Part B because flame-retardant cast urethanes of this type show a steeper hardness drop with excess polyol than unfilled systems. After gelation, the housing is post-cured per the datasheet to complete crosslinking; premature demolding before the specified demold time causes warpage at the vent rib and can reduce flame retardancy by leaving unreacted flame-retardant carrier at the surface. Terminal products include drill motor housings, battery pack shells, and angle grinder guards.
In unattended kitchen appliances, a resin with UL 94 V-0 does not automatically satisfy the glow-wire tests required by IEC 60335-1. The end panel must be tested per IEC 60695-2-11 at the glow-wire temperature specified for the appliance class; for unattended appliances carrying current above 0.5 A, the required glow-wire temperature is often 750 °C to 850 °C depending on clause and supervision condition. Cast urethanes formulated for V-0 may contain phosphorus- or nitrogen-based flame retardants, which can lower the comparative tracking index measured under IEC 60112; this matters when live terminals are mounted on standoffs molded into the panel. Surface resistivity is also a design input, not a material constant: dust, oil mist, and condensed moisture on a kitchen panel can create leakage paths across the cast surface, so the end-product creepage distances per IEC 60335-1 must be maintained after the panel is wiped with detergent. The resin is degassed at −0.095 MPa to −0.10 MPa before mixing; the silicone tool is preheated to 35–40 °C and the mixed material is poured in a single uninterrupted stream. For incidental food contact, the finished panel must be verified against 21 CFR 177.1680 or EU 10/2011 if the material can contact food, because UL 94 certification does not address migration limits. Terminal products include coffee machine side panels, toaster end caps, and air fryer control housings.
Short-run wall-mounted IoT sensor nodes with snap-fit closures expose a different defect mode: the cast skin must be free of entrapped air at the latch root, not merely UL 94 V-0 at 3.0 mm. The two components are dispensed into a degassing chamber and held at −0.095 MPa until the surface foam collapses; a second degassing after mixing is performed for 60–90 s to remove air introduced by the stirring blade. The silicone mold cavity is lightly coated with a volatile release agent, and excess release agent is wiped from the latch root area because localized liquid pools cause surface defects that act as crack initiation sites during repeated snap engagement. The mixing ratio is taken from the lot-specific datasheet; no solvent dilution is permitted, and the addition of tinting paste must be included in the Part B weight calculation because the pigment carrier can shift the effective stoichiometry by 0.2–0.5 wt%. For IoT end products covered by IEC 62368-1, the fire enclosure requirements distinguish between the resin’s V-0 classification and the enclosure’s ability to contain internal ignition; the final wall thickness around the power supply compartment must be verified, and openings near the top surface must meet the standard’s specified dimensions. The cast polypropylene-like surface accepts snap-fit assembly without ejection pin marks, but UV exposure will yellow the unfilled urethane over time; outdoor sensor nodes require an opaque topcoat evaluated under ASTM G154 for UV weathering. Terminal products include wall-mounted sensor nodes, thermostat housings, and gateway enclosures.
Replacing machined nylon or POM with cast flame-retarded urethane in a control pendant changes both the sealing strategy and the post-machining flame-retardant performance. The cast blank is produced in a silicone tool with cored holes and threaded insert locations; the resin is degassed at −0.095 MPa to −0.10 MPa and poured at 30–35 °C to minimize air trapping around insert walls. The supplier’s fixed weight ratio is measured to ±0.5 wt%; because the material is abrasion-sensitive at the machined surface, secondary drilling and tapping must be performed with sharp tools at low feed rates to avoid tearing the flame-retarded skin. UL 94 V-0 applies to the as-cast surface at the certified wall thickness; a machined hole that reduces the local wall below the certified thickness must be re-evaluated, and the exposed cut surface may exhibit a different flammability response than the molded skin. Sealing against IP65 in a cast pendant requires a gasket groove with a flat bottom; silicone mold flash at the parting line must be removed before gasket compression is measured, and the cast urethane’s creep modulus under screw preload determines torque retention. Compliance with IEC 60204-1 for the electrical equipment of machines is assessed on the complete pendant assembly, including cable gland strain relief and earth continuity, not on the resin alone. Terminal products include emergency-stop pendants, cable gland bodies, and operator panel enclosures.
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3D Systems QuickPlastic Cast Urethane Material 94V0 Polypropylene Like is a two-component polyurethane casting system formulated for vacuum casting of prototype and low-volume production parts that require a flame-retardance rating of UL 94 V-0 and a mechanical response approximating unfilled polypropylene. The material is supplied as a resin and hardener pair intended for use in silicone tools produced from stereolithography or PolyJet master patterns. The trade designation QuickPlastic identifies the product family within 3D Systems’ cast urethane portfolio; the 94V0 polypropylene-like grade is distinguished by its combination of a polypropylene-like flexural modulus, snap-fit recovery, and documented flammability classification. Because the product is a cast urethane rather than a thermoplastic, it replicates the assembly behaviour and tactile response of polypropylene in functional prototypes more closely than rigid unfilled cast urethane grades. However, it does not reproduce the full melt-processing, chemical resistance, or living-hinge fatigue behaviour of polypropylene. Typical application fields include electronics housings, appliance control enclosures, connectors, clips, sensor bodies, and short-run functional components where flame-retardance documentation and polypropylene-like compliance are required during design validation. The system is suitable for standard vacuum casting machines with separate resin and hardener degassing chambers, variable-speed mixing, and silicone tool preheating capability. The exact cured properties should be taken from the current 3D Systems technical data sheet for the specific batch, because filled flame-retardant cast urethane systems can vary with filler package, hardener ratio, and post-cure schedule.
The processing boundary for this class of material is governed primarily by moisture sensitivity, mix ratio accuracy, and exotherm control in thick sections. The uncured hardener is isocyanate-bearing, and atmospheric water reacts with isocyanate groups to generate carbon dioxide and urea linkages. This reaction produces microporosity in the cured casting and can reduce the consistency of flame-retardance performance measured under UL 94. Production-scale vacuum casting operations therefore maintain ambient relative humidity below 40% where possible. If the ambient relative humidity exceeds 60%, the silicone tool should be pre-dried at 50 °C for at least 4 h, and resin containers should be blanketed with dry nitrogen during dispensing. Resin and hardener are degassed separately at an absolute pressure below 10 mbar until visual bubble collapse is complete; over-degassing can strip low-molecular-weight components, particularly when the flame-retardant package contains volatile phosphorus-based additives.
Stoichiometric control is critical. In commercial cast urethane formulations of this type, deviations in resin-to-hardener ratio beyond ±0.5 wt% can lower crosslink density, shift the glass transition temperature, and alter the relationship between flexural modulus and elongation at break. The mixed system has a finite pot life at 25 °C; published data for this specific configuration are limited, but similar filled polyurethane casting systems exhibit working lives in the 3 min to 6 min range before viscosity increase prevents complete mould filling. Mould preheating to 60 °C to 80 °C lowers viscosity and accelerates cure, but excessive mould temperature shortens pot life and can promote exothermic blistering. In thick sections, the urethane addition reaction releases heat faster than the silicone tool wall can remove it. Sections thicker than approximately 12 mm may require stepped cure ramps, reduced shot mass, or active mould cooling to avoid centre temperatures that approach degradation thresholds. Blistering and discolouration observed on production vacuum casting lines are commonly traceable to this exotherm path rather than to resin formulation defects. The cure cycle is typically followed by a post-cure step in a forced-air oven; the exact time and temperature must follow the manufacturer’s datasheet because under-post-curing can leave residual unreacted isocyanate and may compromise UL 94 V-0 performance at nominal wall thickness.
The comparative table below places the 94V0 polypropylene-like cast urethane family within the range of unfilled polypropylene and rigid flame-retardant cast urethane grades. Ranges reflect commercial data for mineral-filled, flame-retardant polypropylene-like vacuum casting systems; exact product values should be confirmed against the current 3D Systems datasheet because lot-specific filler loading and hardener selection affect the measured values.
| Property | 94V0 PP-Like Cast Urethane Class | Unfilled Polypropylene | Test Method |
|---|---|---|---|
| Density | 1.02–1.10 g/cm³ | 0.89–0.91 g/cm³ | ISO 1183-1 or ASTM D792 |
| Tensile strength at break | 18–28 MPa | 25–35 MPa | ISO 527-2 / ASTM D638-14 |
| Tensile elongation at break | 15–50% | 100–600% | ISO 527-2 / ASTM D638-14 |
| Flexural modulus | 800–1500 MPa | 1000–1500 MPa | ISO 178 / ASTM D790 |
| Heat deflection temperature at 0.45 MPa | 55–75 °C | 90–105 °C | ISO 75-2 / ASTM D648 |
| Flammability class | V-0 at nominal certified thickness | HB unless flame-retardant modified | UL 94 |
The polypropylene-like behaviour of this grade is expressed primarily through flexural modulus and snap-fit recovery rather than through full polymer-chain extensibility. Unfilled polypropylene exhibits high tensile elongation and excellent living-hinge fatigue resistance; the mineral fillers and flame-retardant additives in the cast urethane reduce tensile strain at break and increase density. Flame-retardant fillers can also reduce comparative tracking index values compared with unfilled polypropylene. When creepage and clearance distances are evaluated under IEC 60112, the exact comparative tracking index value must be obtained from the manufacturer because it is formulation-dependent and cannot be inferred from the UL 94 V-0 class alone.
Electronic enclosure prototyping often subjects the material to repeated snap-fit engagement, elevated internal air temperature, and flammability documentation. On production-scale vacuum casting lines, this 94V0 PP-like system is selected for housing formats with nominal wall thicknesses above 2.0 mm because thinner sections may require longer post-cure or higher mould temperature to achieve the certified UL 94 V-0 rating. The material has been applied in appliance control boxes, industrial sensor bodies, and medical device enclosures where a polypropylene-like tactile response and a recognised flammability class are required. In these applications, the silicone tool should be vented at the final filling point to prevent trapped air; trapped air is the most frequent observed defect in low-viscosity cast urethane filling and appears as surface porosity or flow-front microvoids. Tool design should provide draft angles of 1° to 2° and avoid abrupt wall-thickness transitions. Sections below 1.5 mm may fill incompletely, while sections above 12 mm increase the risk of exotherm-related blistering. If the mould includes undercuts requiring forced demoulding, split-tool construction is preferred because tear-prone thin silicone features shorten tool life and degrade dimensional repeatability over a run of 50 to 100 parts per tool.
The selection boundary for this material is defined by the application’s need for flame retardance, polypropylene-like flexural behaviour, and low-volume process economics. Compared with unfilled polypropylene, the cast urethane is not a direct substitute when the design requires living-hinge flexural endurance beyond approximately 10⁴ cycles. Flexural fatigue data for this specific material in hinge geometries are not typically published; validation should follow ASTM D7774 or an internal fixture that reproduces the hinge radius and angular displacement. The material is also not recommended for continuous immersion in strong bases, aromatic hydrocarbons, or hot water above the heat deflection temperature range because urethane linkages are more hydrolysis-sensitive than polypropylene. In contrast, polypropylene offers better resistance to aqueous acids and alkalis at moderate temperature, although it does not provide inherent UL 94 V-0 flame retardance.
Compared with other cast urethane grades in the QuickPlastic family, the 94V0 PP-like variant trades some stiffness and heat resistance for compliance and flame-retardant certification. Unfilled rigid 94V0 cast urethanes may exhibit higher hardness and lower elongation, making them less suitable for snap-fit closures and impact-absorbing features. Conversely, unfilled polypropylene-like cast urethanes without flame-retardant additives may provide higher tensile elongation and better colourability, but they lack the documented flame-retardance class required for power supply housings, battery compartment covers, and other components subject to electrical ignition risk. The halogen content of this specific grade must be confirmed against the safety data sheet and technical data sheet, because some flame-retardant cast urethanes achieve UL 94 V-0 through halogenated phosphate esters while others use phosphorus-based or melamine-based packages. If the application requires halogen-free materials under IEC 61249-2-21 or a customer-specific restricted substance list, the compliance status of this product must be verified before tooling is committed. Long-term ultraviolet and hydrolysis data for this specific grade are limited; outdoor exposure validation should follow ASTM G154 or ISO 4892-3 if the component will be used in direct sunlight or condensing humidity. Surface adhesion for painting, bonding, or potting can be affected by migration of flame-retardant additives; adhesion tests should be performed using ASTM D3359 after the intended surface preparation and post-cure cycle. The uncured hardener is isocyanate-based, and the resin system should be kept away from amines, alcohols, and water to prevent premature crosslinking before casting.
