| HS Code | 443617 |
| Material Type | Cast Urethane |
| Hardness | 70 Shore A |
| Tensile Strength | 3.5 MPa |
| Tensile Modulus | 10 MPa |
| Elongation At Break | 200% |
| Flexural Strength | 2.0 MPa |
| Flexural Modulus | 10 MPa |
| Izod Impact Strength Notched | 150 J/m |
| Density | 1.13 g/cm³ |
| Viscosity | 400 cP at 30°C |
| Critical Exposure | 11.8 mJ/cm² |
| Penetration Depth | 0.13 mm |
| Build Layer Thickness | 0.10 mm |
| Heat Deflection Temperature | 35°C at 0.45 MPa |
| Color | Translucent amber |
As an accredited 3D Systems QuickPlastic Cast Urethane Material PELike 70 A factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
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3D Systems QuickPlastic Cast Urethane Material PELike 70 A is specified for vacuum-cast urethane part production where a Shore 70 A durometer, low-tack surface character, and short-run tooling economics are required. The material is handled as a two-part polyurethane casting system rather than a thermoplastic melt-processable compound. The application scenarios that follow are restricted to downstream uses in which cast urethane at this hardness grade is currently employed for functional or near-final components, not appearance-only mock-ups. Published data for this exact formulated product is limited in some end-use configurations; where that occurs, values are identified as representative of the 70 A cast urethane class rather than lot-specific certification limits.
In industrial enclosure sealing, the polyurethane is mixed at a fixed ratio of 100:55 by weight prepolymer to curative, with automated dispense tolerance held to ±1.0 part. Moisture is controlled to <0.05% by weight in the prepolymer component before use; when ambient relative humidity exceeds 60%, vacuum drying of the resin at 50–55°C for 2–3 h is required to prevent bubble nucleation inside the gasket cross-section. The uncured mixture is degassed in a vacuum chamber at 5–10 mbar until the foam head collapses, then poured into RTV-2 silicone molds that replicate SLA master patterns of the enclosure faces. Cure is staged: 80°C for 4 h in the mold, followed by 100°C for 16 h post-cure in a forced-air oven. The post-cure schedule is not a processing formality; if the oven temperature falls below 80°C during the first hour, residual isocyanate reaction remains incomplete and the compression set of the gasket under 25% deflection at 70°C per ASTM D395-18 Method B increases by up to 5 percentage points. On production vacuum casting lines, the principal failure mode is not low tensile strength but hardness drift caused by off-ratio mixing: a ±2 part deviation from 100:55 can shift finished Shore A hardness by ±3 A and produce gaskets that either leak at the seal interface or resist assembly because of increased modulus. Compliance for the end-use enclosure sealing application is verified through ASTM D2240-15 for hardness, ASTM D412-16 die C for tensile and elongation, and ASTM D395-18 for compression set; sealing performance of the finished assembly is separately tested under IEC 60529 to confirm the required IP rating, but the cast urethane alone is not an enclosure certification. Terminal product types in this scenario include cable pass-through grommets, junction box face seals, and circular connector boots used in field instrumentation and industrial automation.
| Prepolymer:curative (parts by weight) | Shore A hardness after 16 h at 100°C | Compression set after 22 h at 70°C | Processing consequence |
|---|---|---|---|
| 100:53 | 68 A | 18% | Surface tack increases; seal face recovery after assembly is impaired |
| 100:55 | 70 A | 12% | Nominal processing window for gasket compression set |
| 100:57 | 72 A | 10% | Modulus rises; rigid enclosure bosses show assembly interference |
| 100:60 | 75 A | 8% | Elongation decreases; corner flexures crack during repeated connector debonding |
Shore 70 A cast urethane components for foot orthotics require a different thermal profile from industrial seals because thick heel sections develop greater exothermic gradients during cure. The formulation ratio remains 100:55 prepolymer to curative by weight. Pigment dispersions are limited to 2.0 wt%; additions above this level reduce tear strength measured to ASTM D624-00 die C by more than 8% and create visible flow lines in translucent heel pads. The molding process uses open-pour RTV silicone tooling cast from milled or 3D-printed orthotic positives, with vacuum degassing at 8–12 mbar; after gelation, the parts are demolded and post-cured at 90°C for 12 h. The finished pads are evaluated to ASTM D2240-15 for hardness and ASTM D395-18 for compression set after 24 h at 50±2°C; when intended for prolonged skin contact in custom orthotics, the raw material must be reviewed under ISO 10993-5:2009 and ISO 10993-10:2010, but final biocompatibility is a device-level determination, not a property of the cast elastomer alone. Terminal product types include custom-molded orthotic insoles, metatarsal support pads, and heel cushion inserts with a low-friction PELike skin that reduces socks shear.
Low-volume automotive interior service parts cast from this material are usually processed in silicone tooling produced from SLA master patterns of the original injection-molded thermoplastic component. The formulation is mixed at 100:55 by weight; no external plasticizer is added, so the finished part does not exhibit plasticizer migration fogging on interior glazing under ISO 6452:2000. Flammability testing is conducted to ISO 3795:1989, with a typical acceptance burn rate not exceeding 100 mm/min for automotive interior trim. Vacuum casting is performed with mold temperature at 70°C, followed by post-cure at 100°C for 16 h. If the post-cure oven falls below 80°C, exit hardness remains 68–69 A instead of 70 A, and the part can exhibit residual surface tack and higher compression set after thermal cycling. Compliance is recorded against REACH Regulation (EC) No 1907/2006 for SVHC management and 2011/65/EU for restricted substances in electrical and electronic vehicle subcomponents. Terminal product types include interior trim caps, cable guide grommets, and soft-edge covers for seat belt anchoring areas in aftermarket and low-volume service programs.
| Test area | Method/designation | Acceptance threshold |
|---|---|---|
| Flammability of interior materials | ISO 3795:1989 | burn rate ≤ 100 mm/min |
| Hardness | ASTM D2240-15 | 70 ± 3 A |
| Compression set | ASTM D395-18 Method B | ≤ 15% after 22 h at 70°C |
| SVHC content | REACH Regulation 1907/2006 | <0.1% w/w per article |
Before a diagnostic imaging cushion is released for patient-contact use, the casting environment must exclude amine-containing mold release agents because even trace tertiary amines at the mold wall accelerate the urethane reaction and create a sticky, incompletely cured surface. The working ratio remains 100:55 by weight, but the material is mixed in disposable meter-driven cartridges within an ISO 7 cleanroom to limit particulate inclusions that could transfer to patient-contact surfaces. Vacuum degassing occurs at 5 mbar or lower, and the filled molds are cured at 55–60°C for 8 h, followed by 80°C for 8 h to avoid thermal yellowing of light-colored cushion pads. Compliance is assessed per ISO 10993-5:2009 and ISO 10993-10:2010, with extraction ratios and exposure times determined by the final device category; final manufacturing also falls under 21 CFR Part 820 quality system requirements for finished devices. A raw-material certificate is insufficient to establish device biocompatibility. The resulting cushions exhibit moderate viscoelastic recovery but are not intended for repeated steam sterilization; autoclaving above 121°C causes measurable hardness increase and surface embrittlement. Terminal product types in this scenario include diagnostic imaging headrest cushions, patient bed rail pads, and armrest cushions for clinical laboratory analyzers.
In soft robotic actuator bladders, the 70 A urethane is cast into multi-piece silicone or soluble-core tooling that forms internal channels of 2.0–4.0 mm wall thickness. The prepolymer-to-curative ratio is maintained at 100:55 by weight, but the process window is narrowed by the need to cast thin, actuated membranes without voids: the mixed material is degassed at 3–5 mbar for 90 s before a slow pour down the mold wall to avoid turbulent air entrapment. Lower-viscosity casting temperatures of 45–50°C are used even though this extends gel time; the prolonged working time allows air to escape from blind internal cavities but increases moisture uptake, so the feed vessel is kept under dry nitrogen. Cure is performed at 70°C for 6 h and post-cure at 90°C for 12 h. Tensile and elongation specimens are cut from the same cured lot and tested to ISO 37:2017; tear energy is measured to ASTM D624-00 die C. A non-uniform wall thickness of 0.3 mm across a 2.0 mm bladder will produce asymmetric bending under pressurization and can lead to premature fatigue cracking at the thinnest section. Terminal product types include pneumatic gripper fingertips, bellows actuators, and soft robotic pads for material handling where object contact must not induce surface marking.
Unlike vacuum-cast prototypes intended only for appearance, sports dampening components produced from this material require compression-set resilience under repeated impact. The mixing ratio is 100:55 by weight, and the material is poured into textured silicone tools that replicate energy-absorbing geometries. After degassing at 10 mbar, parts cure at 70°C for 5 h and receive a 90°C for 12 h post-cure. Products are tested to ASTM D2240-15 and ASTM D395-18; compression set values below 15% after 22 h at 70°C indicate acceptable resilience for comfort padding. Terminal product types include helmet comfort liner inserts, protective vest edge pads, and wearable sensor dampeners.
Wearable electronics enclosures and vibration isolators are often bridge-produced in this 70 A cast urethane when injection molding tooling is not yet released. The material is mixed at 100:55 by weight; when color is required, a 1.0–1.5 wt% pigment paste is pre-dispersed in the polyol component and degassed at 50°C for 1 h to remove pigment-bound moisture. The process uses SLA-printed master patterns and silicone block molds; the mixed resin is poured under vacuum at 5–10 mbar, then cured at 80°C for 4 h and post-cured at 100°C for 16 h. RoHS compliance is confirmed against 2011/65/EU Annex II substances, and REACH Candidate List SVHC concentration is documented below 0.1% w/w per article. Hardness is checked to ASTM D2240-15 and compression set to ASTM D395-18 Method B; vibration isolation performance is not inferred from durometer alone but is measured on the assembled device with a modal or forced-response test on an electrodynamic shaker. Terminal product types include wearable device bumper housings, sensor isolation mounts, and battery pack corner buffers.
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3D Systems QuickPlastic Cast Urethane Material PELike 70 A is a two-component polyurethane elastomer formulated for vacuum-cast prototypes that reproduce the tactile compliance and flexural recovery of low-density polyethylene. The designation PELike 70 A identifies a nominal Shore A durometer of 70 tested in accordance with ASTM D2240-15e1 on a 6.0 mm post-cured plaque; the product is not a thermoplastic but a thermoset cast urethane formed by the reaction of an isocyanate prepolymer with a polyol resin. In low-pressure silicone tooling, the mixed resin is degassed, poured, and cured to produce isotropic sections without interlayer fusion planes. Published full tensiometry for this specific configuration is limited; the lot-averaged ranges in Table 1 are supplier-quoted typical ranges rather than design minimums.
| Property | Test method | Typical lot-averaged range |
|---|---|---|
| Hardness, Shore A | ASTM D2240-15e1 | 68–72 |
| Density | ASTM D792-20 | 1.02–1.05 g/cm³ |
| Tensile strength | ASTM D638-14 Type IV | 3.5–6.0 MPa |
| Elongation at break | ASTM D638-14 Type IV | 400–550 % |
| Tensile stress at 100% elongation | ASTM D638-14 Type IV | 1.0–2.0 MPa |
| Tear strength, die C | ASTM D624-00(2020) | 15–25 kN/m |
| Compression set, 22 h / 70°C | ASTM D395-16e1 Method B | 20–35 % |
| Mixed viscosity at 25°C | Brookfield RV, spindle 4, 20 rpm | 800–1500 mPa·s |
The resin is held at 30–35°C before metering and is dispensed through a 2K positive-displacement machine at a weight ratio defined by the lot-specific isocyanate index. A static mixer of 12–24 elements is required to achieve homogeneous mixing; short-shot cures and localized soft zones arise when mixing is incomplete. The mixture is degassed in a vacuum chamber at ≤5 mbar absolute until bubble collapse, typically 60–90 s. Pot life at 25°C falls between 5 and 8 minutes, and viscosity rise is nonlinear. Delaying the pour beyond 80% of gel point produces knit lines and trapped air in thin sections. For silicone tooling, the mold is preheated to 65–70°C, and the polyurethane is cured under vacuum for 60–90 minutes before demolding. A post-cure of 8–16 h at 70°C stabilizes compression set and drives conversion of residual isocyanate.
Ambient relative humidity should remain below 60% during mixing and pouring; at higher moisture loadings, water-isocyanate side reactions generate CO₂ microbubbles and urea linkages that reduce tear strength. External amine-based catalysts are not recommended because uncontrolled tertiary amines shorten pot life below 3 minutes and can create heterogeneous crosslink density in thick sections. Production-scale casting cells equipped with dry nitrogen purge over the resin reservoirs exhibit less Shore A drift than open-bucket lines. When regrind or reclaimed sprue exceeds 5 wt-%, batch-to-batch variation of ±3 Shore A points can occur.
When loaded in uniaxial tension, QuickPlastic PELike 70 A displays a shoulder at 100% elongation rather than the sharp yield point typical of high-density polyethylene. Tensile strength is lower than injection-moulded PE at the same Shore A band; published lot-averaged values of 3.5–6.0 MPa per ASTM D638-14 are not design minimums. Elongation at break of 400–550% supports deep-draw interference fits, but the material retains a higher tensile set than commodity PE after cyclic extension. The stress-strain curve is stress-softening in the first 10 cycles; prototypes subjected to repeated snap-fit engagement should be pre-conditioned with 5 cycles to 80% of expected service strain before dimensional inspection.
Tear resistance of 15–25 kN/m by ASTM D624-00(2020) Die C is lower than high-performance polyester urethanes but sufficient for gasket ribs and small sealing lips. Compression set of 20–35% after 22 h at 70°C indicates that sealing prototypes should be assessed for short-term static recovery rather than long-term creep. Creep compliance at room temperature is not formally qualified under supplier documentation; published data for long-duration creep in this specific configuration is limited. Where sustained load is required, prototype testing should use ASTM D2990-17 on machined cast plaques and compare directly against the intended moulded PE grade.
Low-pressure casting is selected when the prototype geometry requires complex undercuts or multiple overmoulded lips that cannot be ejected from metal tooling. Unlike reaction injection moulding, the process uses a silicone tool and gravity or low-pressure injection below 2 bar, which reduces tooling cost and permits cast-in inserts but limits wall-section uniformity. Wall thickness below 2.5 mm can produce flow hesitation and unreacted material at end-of-fill; sections above 10 mm can exhibit an exothermic core rise that shifts hardness lower by 2–4 Shore A points relative to thin sections.
Thermocouple data from 8–10 mm silicone tools in production casting indicate peak exotherms of 85–95°C with fast-cure formulations; maintaining mold temperature at 70°C rather than using higher acceleration limits that exotherm. Reaction injection moulding equipment with high-pressure impingement mixing provides shorter demold cycles and higher lot-to-lot consistency, but is economically justified only at volumes exceeding several thousand parts. For pre-production validation of gaskets, bellows, and wearable device straps, vacuum casting of QuickPlastic PELike 70 A through a silicone tool offers isotropic stress distribution because the cast section has no flow-induced skin-core morphology of the type observed in injection-moulded semicrystalline PE.
In cantilever snap-fit prototypes, beam-root strain should be kept below 50% of the tensile elongation at break unless the design has been validated by ASTM D638-14 data and cyclic testing to 10,000 closures. Living hinges cast in Shore A 70 urethane fail by tear propagation rather than by the oriented crystalline hinge morphology that gives polypropylene its endurance. A hinge thickness below 0.8 mm combined with a bending angle above 150° is not recommended for more than 1,000 cycles. Abrasion resistance is lower than higher-durometer urethanes such as 80–90 A grades; if a snap-fit ejector button or textured grip is exposed to repeated sliding contact, the surface should be evaluated under ASTM D4060-19 Taber testing rather than qualitative feel.
Vibration-damping pads have been produced at 5–10 mm thickness with the material when compression set and recovery are acceptable. For dynamic applications above 10 Hz, published data for storage modulus and loss factor across temperature are limited; component-level testing should follow ISO 6721-4 dynamic mechanical analysis on cast specimens.
Differentiation from adjacent cast urethane grades and direct-print elastomers is expressed primarily in hardness, tear strength, compression set, and isotropy. Table 2 compares the nominal property band of QuickPlastic PELike 70 A with adjacent Shore A cast urethane grades.
| Material reference | Nominal hardness | Tensile strength | Elongation at break | Tear strength, die C |
|---|---|---|---|---|
| QuickPlastic PELike 60 A | 60 Shore A | 3.0–5.0 MPa | 500–650 % | 12–20 kN/m |
| QuickPlastic PELike 70 A | 68–72 Shore A | 3.5–6.0 MPa | 400–550 % | 15–25 kN/m |
| QuickPlastic PELike 80 A | 78–82 Shore A | 5.0–7.5 MPa | 350–500 % | 20–30 kN/m |
| QuickPlastic PELike 90 A | 88–92 Shore A | 7.0–10.0 MPa | 250–400 % | 25–40 kN/m |
The 70 A grade sits in the middle of the cast urethane family. Compared with a direct-printed photopolymer elastomer of similar durometer, the cast urethane exhibits no build-layer anisotropy and no support-structure witness marks; however, the two-component resin requires vacuum degassing and moisture control that are unnecessary in a photopolymer bath. For applications requiring chemical resistance to hydrocarbons, published resistance data for this specific configuration is limited; compatibility should be tested according to ASTM D471-16a at the intended service temperature and fluid concentration.
