| HS Code | 876648 |
| Material Type | Cast Urethane |
| Color | Translucent White |
| Hardness | 60 Shore A |
| Tensile Strength | 5.5 MPa |
| Elongation At Break | 250% |
| Tensile Modulus | 12 MPa |
| Flexural Modulus | 14 MPa |
| Tear Strength | 25 kN/m |
| Impact Strength | 100 J/m |
| Density | 1.05 g/cm³ |
| Heat Deflection Temperature | 45 °C at 0.45 MPa |
| Water Absorption | 0.4% |
| Dielectric Strength | 15 kV/mm |
| Volume Resistivity | 10^14 ohm-cm |
| Coefficient Of Thermal Expansion | 150 µm/m/°C |
As an accredited 3D Systems QuickPlastic Cast Urethane Material PELike 60 A factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
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Long-term retention of flange sealing force at low compressive loads governs the use of a Shore 60A castable urethane in industrial enclosure gaskets more than immediate elastomeric recovery. Hardness is verified according to ASTM D2240-15e1 at 23±2 °C with a 15 s dwell, and compression set is measured under ASTM D395-16e1 Method B at 70 °C for 22 h with 25% deflection; a typical acceptance band for enclosure-grade Shore 60A urethane is compression set at or below 35%. For sealed electrical and telecommunication enclosures, the cured component must function within IEC 60529:2013 IP67 and NEMA 250-2020 Type 4 service conditions, while the liquid resin and cured article remain subject to REACH SVHC screening and RoHS Directive 2011/65/EU Annex II restricted-substance limits. At compounding or dispensing, the prepolymer-to-curative ratio is held at the manufacturer-specified stoichiometric index, normally between 0.95 and 1.05 NCO:OH for 60A systems; downstream process additions are limited to 0.3–0.8 wt% of a molecular-sieve moisture scavenger when ambient relative humidity exceeds 60% and 0.05–0.2 wt% of a silicone-free defoamer where vacuum degassing is not available. Addition of non-reactive diluents above 1.0 wt% of total batch mass is not advised because Shore hardness can drift below 58A and compression set can exceed 45%. The mixed compound is degassed at −0.095 MPa for 5–8 min, then poured or meter-mix dispensed into 60–70 °C aluminum or silicone tools at a cavity pressure not exceeding 0.2 MPa. Demold time ranges from 8–16 h depending on tool mass, followed by a post-cure cycle of 16 h at 100 °C to complete chain extension and reduce residual reactive sites. In vacuum casting cells, production-scale two-component meter-mix equipment with dynamic mixing at 1,800–2,500 rpm and shot-size accuracy within ±1% is used to limit hard-segment domain variation. Terminal products include IP67 cabinet gaskets, cable entry seals, flange gaskets for pump enclosures, and door perimeter profiles for outdoor telecommunication cabinets. The most frequently observed production-line defect is not gross chemical incompatibility but pinhole porosity caused by residual moisture or excess catalyst accelerating carbon dioxide liberation before gelation.
A curing cell dedicated to short-run protective bumpers for portable diagnostic instruments operates without a formal scene title because the process boundary is defined by tool temperature, not application labeling. The material as supplied is a formulated castable urethane; therefore the base prepolymer-to-curative ratio is not modified in the field, while pigment paste addition is restricted to 0.5–1.0 phr and UV stabilizer loading to 0.2–0.6 phr to avoid measurable Shore A drift and exudation after aging. For skin-contact device housings and bumpers, the cured article is evaluated under ISO 10993-5:2009 for cytotoxicity and ISO 10993-10:2021 for sensitization and irritation when the intended use includes prolonged skin contact; published data for this specific QuickPlastic grade in a full biocompatibility file remains limited, so lot-specific testing is required before medical device submission. Processing is performed by vacuum casting into platinum-cure silicone tools maintained at 40–50 °C, because lower tool temperatures extend gel time but increase surface tack, while higher tool temperatures shorten working life below the required 3–5 min for complete cavity fill. After vacuum chamber fill at −0.09 MPa to −0.10 MPa, parts are left under pressure for 12–16 h before demold, then post-cured at 80 °C for 8 h to stabilize hardness and reduce leachable residues. Terminal components produced through this route include corner guards for handheld diagnostic analyzers, protective bezel gaskets for point-of-care instruments, and impact-resistant edge trim for portable field monitors. Production records show that mold release selection is the dominant variable affecting reject rate; silicone-containing external release agents can migrate into the cast surface and produce visible separation at the part-tool interface where wall thickness drops below 1.5 mm.
For motor-generator skids and pump baseplates, the Shore 60A urethane is cast directly against prepared steel inserts, and the governing design parameter is dynamic stiffness at service temperature rather than room-temperature hardness. Compliance testing for vibration isolators references ISO 10846-1:2008 for frequency-dependent dynamic stiffness measurement and DIN 53513:1990 for viscoelastic properties under forced sinusoidal compression; abrasion resistance is benchmarked with ISO 4649:2020 Method A using a 10 N load and 42 m path. Surface preparation of the steel core follows ISO 8501-1:2007 Sa 2½ abrasive blast cleaning, with a minimum anchor profile of 25–50 µm, immediately before a thermosetting adhesive primer is applied; without this mechanical key, the cast urethane can debond at the steel-elastomer interface under repeated shear loads exceeding 0.3 MPa. The formulation addition stage is limited to process aids: 0.3–0.7 wt% of a moisture scavenger is added to the prepolymer side before degassing, and 0.5–1.5 wt% of an internal mold release is added only when tool geometry includes deep undercuts below 1° draft. The mixed material is degassed under −0.095 MPa for 8–12 min, then poured into preheated 70–80 °C steel or aluminum tooling containing the insert. Gelation begins within 6–10 min at 70 °C, which is a critical processing window because longer pour times allow air entrapment at the steel-elastomer boundary. Demold occurs after 16 h at 60 °C, and the component is post-cured at 100 °C for 16 h to complete transurethanization and reduce viscoelastic drift. Terminal products include motor mounting blocks, pump base isolators, generator feet, and cylindrical vibration dampers used in HVAC equipment frames. Observed batch-to-batch variance in production-scale mixing is primarily associated with hard-segment crystallinity and can shift Shore hardness by ±2A when the curative is not conditioned at 25–30 °C for 12 h before use.
Impact pads and transfer-point liners for bulk material handling use the same Shore 60A cast urethane where high rebound, low coefficient of friction, and resistance to sliding wear dominate. The material is cast into open steel-backed molds at 60–65 °C; the base formulation is not adjusted for hardness but 1.0–2.0 wt% of a solid lubricant additive such as molybdenum disulfide or graphite may be incorporated when dry particle sliding is expected, and 0.5–1.0 wt% of a moisture scavenger is added to counteract humid plant air. Abrasion loss is tested to ISO 4649:2020 Method A with an acceptable mass loss below 150 mm³ for non-severe chute liner service, while tear strength is measured under ASTM D624-00 Die C at 50 mm/min. Casting is performed directly onto sandblasted mild steel backing plates with a 50–75 µm anchor profile, using a two-component meter-mix dispenser with static mixing elements to reduce air entrapment. Demold time is 4–6 h at a tool temperature of 65 °C, and post-cure proceeds at 100 °C for 12 h. Terminal products include chute liners, skirtboard rubber, impact pads under conveyor transfer points, and screen undersize sealing strips. In high-abrasion production environments, the limiting operational variable is not the polyurethane matrix but the backing preparation; pre-cut steel plates stored outdoors more than 24 h before casting can develop flash rust that produces immediate adhesion loss at the bond line.
Flexible bellows for robotic end-effectors and automated packaging equipment are demolded from deep-cavity silicone or aluminum tools where draft angles below 0.3° impose high local stresses at the part-tool interface. Under these conditions, the limiting mechanical property is not tensile elongation but tear initiation resistance, measured under ASTM D624-00 Die C at 50 mm/min with a typical minimum acceptance value of 25 kN/m for Shore 60A cast urethane bellows. Cyclic flex performance is evaluated according to ASTM D430-06 Method B dynamic fatigue, combined with ISO 37:2017 tensile stress-strain testing at a test speed of 500 mm/min. The formulation addition ratio at the dispensing unit is maintained within the manufacturer’s specified NCO:OH index, while 0.2–0.5 wt% of a thixotropic agent is introduced to prevent run-off on vertical tool walls and 0.3–0.8 wt% of a moisture scavenger is added before the degassing cycle. Vacuum degassing is performed at −0.09 MPa for 10–15 min because deep-cavity bellows tools trap air at the convolute roots; incomplete degassing produces a visible series of subsurface voids that concentrate stress at each bellows fold. The material is cast into heated tools at 60–70 °C, left under mold pressure for 12–18 h, demolded, and post-cured at 95–100 °C for 14–16 h. Terminal products include convoluted suction cup bellows for case packing, flexible protective covers for linear actuators, and soft-robotic finger sleeves that must withstand repeated deformation without crack propagation. Production-scale failure analysis indicates that mold release selection is critical when tool draft is below 0.3°; amino-functional silicone release agents can cause a surface cure inhibition layer that reduces tear strength by as much as 20% if applied excessively before casting.
Wearable diagnostic housings require a castable Shore 60A material that maintains skin-contact compliance while resisting sebum, ethanol-based cleaning agents, and repeated bending at body temperature. For this segment, the compliance file includes ISO 10993-5:2009 cytotoxicity evaluation by extraction and ISO 10993-10:2021 skin sensitization and irritation testing; when the component is intended to contact intact skin for more than 30 days, ISO 10993-23:2021 irritation testing also applies. Because the resin is not supplied with a complete biological safety master file for every wearable configuration, published data for this specific formulation is limited and downstream medical device manufacturers must qualify each lot through a dedicated extractables and leachables study aligned with ISO 10993-18:2020. The formulation addition ratio in this application excludes aromatic amine catalysts and silicone oils; any additive package is limited to 0.1–0.4 wt% of a medical-grade antioxidant and 0.2–0.5 wt% of a non-ionic internal release agent that has passed cytotoxicity screening. Processing is conducted in a controlled environment at 22–25 °C and 40–60% relative humidity to prevent moisture uptake before casting; the two-component mixture is degassed at −0.098 MPa for 5–10 min, cast into silicone tools, and cured at 45–55 °C for 16–20 h. Post-curing at 80 °C for 8 h reduces the level of solvent-extractable low-molecular-weight species by driving the reaction toward higher molecular weight. Terminal products include skin-contact cushions for wearable electrocardiogram monitors, flexible straps for continuous glucose monitors, and replaceable gasket rings for medical-grade smartwatch assemblies. The principal operational boundary in this segment is sterilization compatibility; steam sterilization above 121 °C may produce permanent compression set above 40%, so hydrogen peroxide gas plasma or gamma irradiation at 25–40 kGy is preferred when sterilization is required.
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3D Systems QuickPlastic Cast Urethane Material PELike 60 A is a two-part, room-temperature-curing polyurethane elastomer supplied for silicone-mold vacuum casting of short-run and bridge-tooled components. The grade is specified to reach 60 Shore A durometer after complete ambient or accelerated post-cure when measured according to ASTM D2240 on a cast plaque of at least 6 mm nominal thickness. Tensile response is evaluated under ASTM D412 / DIN 53504; typical unfilled systems in this hardness class exhibit tensile strengths between 4.5 MPa and 6.5 MPa and elongation at break from 350% to 500%. Tear strength, measured as Type C under ASTM D624, is commonly reported between 18 kN/m and 28 kN/m for fully post-cured cast sections. The material is used to approximate the flexibility, surface drag, and tear propagation behavior of low-density polyethylene or impact-modified polyolefin components in gaskets, seals, dust boots, cable grommets, bellows, and snap-fit housings produced from stereolithography or CNC master patterns.
| Property | Typical range | Test method |
|---|---|---|
| Hardness | 58–62 Shore A | ASTM D2240 |
| Tensile strength | 4.5–6.5 MPa | ASTM D412 / DIN 53504 |
| Elongation at break | 350–500% | ASTM D412 / DIN 53504 |
| Tear strength, Type C | 18–28 kN/m | ASTM D624 |
| Specific gravity | 1.04–1.08 | ASTM D792 |
| Linear mold shrinkage | 0.3–0.7% | Internal method, 7 days at 23 °C |
The liquid system is supplied as an isocyanate-containing prepolymer and a polyol/curative side. The two components are mixed in a weight ratio specified by the batch certificate; typical vacuum casting grades require a mixed viscosity below 1,500 cP at 25 °C to penetrate ribs and bosses. Published data for this specific grade’s nominal mix ratio and viscosity are limited in public sources; production cells should request the batch-specific certificate of analysis from 3D Systems. Any comparison with directly printed photopolymer elastomers should account for the absence of layer-plane anisotropy and polymerized-in residual stress in cast urethane parts, but also for the additional silicone-tooling step and longer demold time.
Ambient relative humidity above 60% RH is the dominant variable in production cells using open-top silicone book molds. The A-side isocyanate reacts preferentially with atmospheric water, generating carbon dioxide and carbamic acid intermediates that reduce part density and create surface pinholes. Silicone tooling should be dehydrated at 60 °C for a minimum of 2 h prior to pouring; resin containers should be conditioned in dry-nitrogen-purged cabinets or vacuum degassed at −0.095 MPa for 10–15 min after reaching a mix temperature of 23–30 °C. The mixed viscosity remains below 1,500 cP during the first 5 min under these conditions, allowing complete draw into thin ribs. Pot life for a 200 g mass at 25 °C is typically in the 15–25 min range; preheating the resin to 40 °C reduces pot life to less than 10 min. Operators should avoid mixing masses greater than 1 kg in a single container because the exothermic cure raises the bulk temperature above 80 °C and triggers localized scorch or bubble formation in sections thicker than 20 mm. Production-scale vacuum casting cells using two-stage rotary vane pumps should maintain chamber absolute pressure below 10 mbar during pour; insufficient vacuum is a frequent cause of voids in closed bosses and undercuts. Polyol-side moisture content above 0.05% by Karl Fischer titration is associated with bubble formation and hardness drift.
Because the material is poured as a low-viscosity liquid and cured in a closed silicone cavity, mechanical properties are largely independent of direction, unlike layer-based elastomers that show reduced tensile and tear strength perpendicular to the build plane. Coupons cut parallel and perpendicular to a cast bar’s long axis generally show tear strength variation below 10% under ASTM D624 Type C. The elastomer’s recovery after 100% tensile elongation is typically associated with a permanent set below 5% after 10 min relaxation at 23 °C. Continuous service conditions should be limited to a range of −20 °C to 70 °C; below the lower bound, impact resistance declines as the polymer approaches its glass transition. Above the upper bound, hydrolytic cleavage of ester or ether linkages—depending on the polyol architecture—becomes the dominant aging mechanism. Published data for long-term hydrolytic aging of this specific PELike 60 A grade is limited; accelerated testing in 80 °C water or 95% relative humidity should be conducted before specifying it for continuous hot-wet service.
Demolding a 50 mm bore seal with 0.5 mm radial squeeze requires the silicone tool to be cut with an inner diameter compensated for 0.3–0.7% linear shrinkage. For the specified 50 mm dimension, the cavity should be enlarged by approximately 0.15–0.35 mm. Undercuts deeper than 10% of the local wall thickness can be withdrawn without mechanical lifters in low-durometer tools, but split-line tearing occurs when the release film is incomplete. A solvent-free silicone release agent is preferred; amine-containing mold releases or amine-based epoxy tooling surfaces can accelerate the isocyanate reaction at the surface and produce a tacky skin. Parts should remain in the mold for 16–24 h at 23–25 °C before demolding to permit green strength development. Premature demolding at 8 h often produces permanent deformation at thin flanges and unacceptable parting-line flash adhesion.
Numerical hardness equivalence between 60 Shore A cast urethane and LDPE is not direct; LDPE is typically measured at 45–55 Shore D. The designation PE-like reflects a selected balance of low modulus, surface feel, and elastic recovery rather than a durometer match. For thin-wall sections of 2–4 mm, a 60 A polyurethane may exhibit secant flexural modulus in the 15–30 MPa range, while LDPE commonly falls between 200 MPa and 400 MPa; the urethane is therefore more flexible under equivalent bending loads. This behavior is useful when prototypes must evaluate snap-fit insertion force, living-hinge endurance, and seal conformance without the brittle failure modes of rigid cast acrylic or ABS-like materials. Compared with the 40 A and 80 A QuickPlastic durometer grades, PELike 60 A occupies an intermediate position: higher tensile and tear resistance than the 40 A material, lower hardness and higher elongation than typical 80 A systems. Selection should be based on the production thermoplastic’s secant modulus and the peak service strain rather than hardness alone.
Batch acceptance for production-grade silicone-molded runs should include a 6 mm tensile plaque and a 2 mm tear specimen cured in the same tooling and post-cure cycle as the molded components. Hardness shall be checked at 23 °C after 7 days. A recorded durometer shift of more than ±3 Shore A from the batch mean indicates off-ratio mixing or incomplete degassing. Incoming liquid should be tested for viscosity by rotational viscometer at 25 °C; an increase greater than 20% from the certificate value suggests moisture ingress or prepolymer advancement. Containers should be blanketed with dry nitrogen after each withdrawal and stored at 15–25 °C. The product should not be processed with amine-based additives or tin catalysts beyond the levels specified by the supplier because accelerated chain extension can cause local gelation in the mix cup.
