Carbon Printers RPU 61 Rigid Polyurethane
- Название продукта: Carbon Printers RPU 61 Rigid Polyurethane
- Сайт Factroy: Округ Юду, Ганьчжоу, Цзянси, Китай
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- Производитель: Ascent Petrochem Holdings Co., Limited
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- Carbon Printers RPU 61 Rigid Polyurethane is typically used in formulations when mechanical property targets and service temperature limits must be controlled within specific ranges.
| Код ТН ВЭД | 443346 |
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Interior Brackets Are Produced Without Injection-Mold Tooling When Volumes Stay Below 5,000 Units
Carbon Printers RPU 61 Rigid Polyurethane is processed at 100 wt% formulated solids without reactive diluent, external curative, or plasticizer addition; solid fill fraction is maintained at 85–100 vol% for snap-fit arms and screw bosses, while 55–70 vol% fill is restricted to non-load-bearing walls with section thickness above 3.0 mm. In automotive interior applications, the resin is specified for HVAC actuator brackets, air door lever clips, and wiring harness retention arrays where production volumes under 5,000 units/year make injection-mold tooling economically unviable. Industry compliance for these parts centers on horizontal burn behavior under ISO 3795:1989 and FMVSS 302 at section thicknesses of 2.0 mm; where final wall thickness deviates from the tested coupon, published data for the exact post-cured RPU 61 configuration is limited and part-level testing is required before release. Downstream production uses Carbon M2 or M3 digital light synthesis printers at 100 µm slice thickness with snap-beams oriented within 10° of the XY plane to preserve ASTM D256 Izod impact continuity; solvent wash removes residual uncured resin, and forced-air post-cure completes the urethane crosslink network. Threaded bosses receive brass inserts by thermal insertion at 150–180 °C, with boss outer diameter held to 2.5× the nominal thread diameter to prevent radial cracking. Terminal finished product types include HVAC air distribution duct adapters, vacuum flap actuator links, and two-stage harness clip arrays. A threshold limitation exists across Z-layers: snap-fit features oriented beyond 10° from the XY plane lose notched impact energy and require root fillets of at least 0.5 mm to compensate for interlayer stress concentration.
Where portable diagnostic, battery-test, and RF power meter enclosures require flame-rated housings without tooling commitment, RPU 61 is substituted for FR-ABS in pilot runs of 200–3,000 units. The compliance anchor is UL 94 HB at 1.5 mm and 2.0 mm wall stock, IEC 62368-1:2020 for information technology and audio/video equipment safety, and IEC 60529 IP30/IP40 dust tests for indoor equipment; if production wall thickness differs from the coupon, part-level certification against the final post-cure geometry is required. Formulation addition ratio: the resin is not blended with additional polyols, isocyanates, flame retardants, or plasticizers; it is used as a 100 wt% single-cartridge photopolymer system with 80–100 vol% solid fill in screw bosses and snap locks, and 45–65 vol% infill in non-structural air-flow ribs. Production equipment includes Carbon M2/M3 digital light synthesis printers with 50–100 µm slices, two-stage isopropanol wash in 95–99% solvent, compressed-air drying at 1.5–3.0 bar, and forced-air oven post-cure with rack spacing greater than 40 mm to avoid localized under-cure at midpoints. Batch-to-batch variance on production fleets is most significant in Z-axis orientation; if outer shell walls exceed 4.0 mm, differential shrinkage between thick bosses and thin ribs produces sink beyond 0.15 mm unless rib-to-wall ratio is capped at 0.5 and boss caps are cored. Terminal finished product types include benchtop power supply front bezels, battery analyzer housings, hand-held RF power meter end caps, and cable connector strain-relief shells. The operational boundary is pronounced: UL 94 HB is not V-0, so RPU 61 should not be assigned to primary enclosures requiring V-0 unless an external flame barrier is added.
Why Does Post-Cure Rack Spacing Dictate Notched Impact Uniformity in Robotic End-Effector Bodies?
For collaborative robot end-of-arm tooling with payloads between 3 kg and 15 kg, RPU 61 is used in gripper fingers, vacuum cup adapters, pallet nests, and sensor brackets where mass reduction and corrosion resistance outweigh the absolute stiffness of 6061-T6 aluminum. The human-safety and machinery compliance framework is ISO 10218-1:2011, ISO/TS 15066:2016 for force-limited collaborative operation, and ISO 12100:2010 for risk assessment. Formulation addition ratio for these parts is 100 wt% RPU 61 with no filler addition; part density is tuned through geometric fill: 100 vol% solid under compression contact points, 60–80 vol% in shear-dominated webs, and 30–50 vol% triply periodic lattice in low-stress alignment spacers. The downstream production process involves DLS printing at 50 µm slice thickness for gripper tooth profiles to preserve edge sharpness, post-print solvent removal in a dual-bath system with fresh-solvent second stage, and thermal cure with aluminum fixture plates contacting the part base to reduce Z-axis upward deflection. Threaded steel helicoils are installed by heat-stake insertion at 160–190 °C into bosses with 0.3 mm radial interference; the boss wall must not be placed on a Z-plane without an additional 1.0 mm concentric reinforcement. Experience from production-scale multiple-printer fleets shows that post-cure oven temperature gradients above 8 °C across a rack can cause socket bore diameters to vary by 0.06–0.10 mm, close to the press-fit tolerance for 4 mm steel dowels; rack rotation and thermocouple mapping are therefore specified. Terminal products include two-finger servo gripper jaws, vacuum cup end-effector adapters, robotic pallet nesting fixtures, and belt-driven placement head sensor mounts. The key mechanical limitation is lower elastic modulus than glass-filled nylon; if a gripper finger is cantilevered longer than 60 mm and load exceeds 40 N at the tip, flexural deflection under ISO 178:2019 should be simulated and compared to part tolerance before cutting production build plates.
When vacuum blower covers, filter caps, ejector bodies, and air-knife manifolds operate below 0.8 bar gauge, RPU 61 replaces cast aluminium and glass-filled polypropylene in material-handling vacuum systems and non-pressure compressed-air housings. The applicable compliance anchor is ISO 4414:2010 for pneumatic systems and the Machinery Directive 2006/42/EC when the component is integrated into material-handling equipment; no pressure-bearing boundary is assigned because RPU 61 is not specified for components containing stored gas above 1.0 bar. In formulation terms, addition ratio is 0 wt% external curative or filler; the material is processed at 100 wt% active resin solids. Geometric fill fraction is 90–100 vol% at barb and thread regions, while outer bodies use 50–70 vol% closed-cell infill to reduce mass while retaining stiffness. Downstream production route: CLIP/DLS printing on Carbon M2 systems at 100 µm, followed by isopropanol wash, dry-air purge, and oven post-cure per the Carbon RPU 61 technical datasheet; sealing surfaces are machined or wet-sanded to Ra 1.6–3.2 µm if an O-ring seal is required, because as-printed Z-layer surfaces may exhibit sealing leakage paths above 20 µm roughness. Threads are cut with ISO 228 G 1/8 or G 1/4 taps rather than printed, because printed thread flanks below 1.0 mm pitch show inconsistent dimensional accuracy across builds. Terminal finished product types include vacuum blower inlet adapters, filter cartridge caps, air-knife nozzle housings, and ejector block shells. Operational boundary: prolonged exposure to compressor oil mist above 80 °C or to strong polar solvents should be avoided because polyurethane segments plasticize and compressive modulus under ISO 604 drops measurably.
UAV Sensor Housings, Antenna Brackets, and Camera Gimbal Adapter Plates
RPU 61 is applied to low-rate UAV production for camera gimbal adapter plates, antenna mast brackets, LiDAR shield frames, and stackable power distribution board trays where impact resistance at low mass and post-processing ease reduce part count. The standards anchor for this sector is ASTM F2910-22 for small unmanned aircraft design and construction; electromagnetic interference issues are not addressed by the base resin, and conductive coatings or metallic inserts are required for shielding. Formulation addition ratio: the resin operates as a 100 wt% photopolymer system; no glass fiber, talc, or elastomer blending is performed before printing. Structural regions under landing or vibration loads use 100 vol% solid fill in 3.0–5.0 mm plate sections, while non-critical standoff regions use 40–60 vol% hexagonal lattice fill to lower auxiliary airframe mass. The downstream process includes DLS printing at 50 µm in high-resolution mode for gimbal plates, two-stage solvent wash, and thermal post-cure with parts restrained by low-stress fixtures to minimize warpage; mounting holes are reamed to H7 tolerances after cure because as-printed hole diameter can vary by 0.08–0.12 mm depending on part orientation. Steel threaded inserts are heat-stake installed at 160–190 °C; adhesive-bonded nylon captive nuts are specified where vibration isolation mounts are required. Finished terminal products include gimbal pitch-axis adapter plates, GPS/RTK antenna mast brackets, LiDAR puck isolation frames, and power distribution board stack spacers. The material is not UV-stabilized for long-term exterior exposure; unpainted parts exposed to 1,000 hours of ISO 4892-2 UV-A weathering can exhibit surface yellowing and minor hardness increase, so opaque polyurethane or acrylic topcoats are required for outdoor deployment.
When Low-Volume Power Tool Housings Must Survive 1.5 m Drop Cycles Without Boss Fracture
For accessory housings and battery adapter shells in cordless power tools produced in runs of 500–10,000, RPU 61 is assessed against drop-test requirements of 1.5 m onto concrete at 23 °C, using a 100 wt% resin system with no post-added impact modifiers. Compliance anchors include IEC 62841-1 for hand-held motor-operated electric tools, UL 94 HB at wall stock of 1.5 mm or 2.0 mm, and part-level verification against final post-cure geometry when non-standard wall sections are used. Formulation addition ratio: all regions receiving clips or screws are printed at 100 vol% solid; the battery latch flexure arm is oriented in the XY plane to preserve ASTM D256 notched impact values; non-loaded shells use 60–80 vol% infill to reduce mass while maintaining shell stiffness. Process: DLS printing at 100 µm, solvent wash with fresh IPA second stage, forced-air post-cure with bottom-side aluminum support to prevent saddle-shaped warpage on long housing halves; screw bosses are drilled and fitted with ultrasonically inserted brass inserts. Terminal parts include aftermarket 18 V battery adapter shells, dust extractor adapter collars, oscillating tool accessory housings, and angle grinder flange covers. The operational limit is the material’s heat deflection temperature; continuous contact with gearbox housings above 60 °C can cause creep in threaded bosses, and mineral-filled nylon or PBT is required for that interface. Published data for repeated drop-cycle performance at non-standard wall thickness is limited; therefore a 20-piece drop test is recommended before series production.
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- Carbon Printers RPU 61 Rigid Polyurethane Производится в соответствии с системой качества ISO 9001 и отвечает соответствующим нормативным требованиям.
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Carbon Printers RPU 61 Rigid Polyurethane is a two-component, dual-cure photopolymer resin designed for Carbon Digital Light Synthesis (DLS) additive manufacturing systems. The resin is supplied as a two-part liquid that is blended by the printer’s automated metering and recirculation hardware before being exposed to the CLIP process, in which UV light polymerizes a methacrylate scaffold in the build zone while oxygen inhibition creates a liquid interface. After printing, the green part is washed in solvent and thermally cured in a forced-air oven to complete the isocyanate-polyol reaction network. The final product is a black, rigid polyurethane with a density of 1.10–1.12 g/cm³ under ISO 1183-1:2019 and a Shore D hardness of 74–78 under ASTM D2240-15. Published datasheet values place tensile strength between 35 and 39 MPa and tensile modulus between 1.1 and 1.4 GPa under ASTM D638-14. These properties position RPU 61 as a stiff but not brittle material for functional prototypes, manufacturing aids, and low-volume production components.
The distinguishing feature of RPU 61 is its elongation at break of 8–10%, which is higher than typical highly crosslinked rigid polyurethane and epoxy DLS resins. The impact resistance, measured as notched Izod under ASTM D256-10, falls in the 40–50 J/m range. This performance is achieved without fiber reinforcement, so the material maintains more isotropic behavior across build planes. In practice, Z-direction tensile values are within 5–10% of XY-direction values when the part is printed at 100 µm layer thickness and fully cured. The absence of glass or carbon filler also permits smoother down-facing surfaces in concave geometry than filled resins produce, though it limits upper-use temperature and creep resistance under sustained load.
Compared with RPU 70, the more commonly specified rigid polyurethane in the Carbon portfolio, RPU 61 trades heat deflection temperature for ductility. RPU 70 exhibits a heat deflection temperature at 0.455 MPa of approximately 65–70 °C, while RPU 61 is typically documented at 50–55 °C under ASTM D648-18. This does not make RPU 61 an inferior material for all cases; in applications where the highest part temperature does not exceed 40 °C and the dominant failure mode is crack initiation at a snap-fit or clip, the RPU 61 network often shows fewer brittle fractures than RPU 70. The product also differs from flexible polyurethane resins such as FPU 50, which are specified for elastomeric applications with elongation above 50% but far lower modulus. At the molecular level, the dual-cure system separates the build-speed function from the final mechanical performance function. The UV-cured acrylate structure fixes the part form during printing and provides green strength. The subsequent isocyanate-polyol reaction builds a high-molecular-weight polyurethane network that contributes impact resistance and moderate chemical resistance.
What Is the Comparative Property Profile of RPU 61, RPU 70, and Epoxy-Based DLS Materials?
Direct substitution between rigid resins requires comparison of the published property window. The table below lists typical representative values for three Carbon DLS materials after full cure and conditioning at 23 ± 2 °C and 50 ± 10% RH. The values should not be read as guaranteed lot-specific properties; they are supplied as engineering reference points only.
| Property | Test method | RPU 61 | RPU 70 | EPX 82 |
|---|---|---|---|---|
| Density | ISO 1183-1:2019 | 1.10–1.12 g/cm³ | 1.10–1.12 g/cm³ | 1.10–1.20 g/cm³ |
| Tensile strength | ASTM D638-14 | 35–39 MPa | 40–44 MPa | 80–90 MPa |
| Tensile modulus | ASTM D638-14 | 1.1–1.4 GPa | 1.5–1.7 GPa | 2.4–2.8 GPa |
| Elongation at break | ASTM D638-14 | 8–10% | 5–7% | 4–6% |
| Notched Izod | ASTM D256-10 | 40–50 J/m | 30–40 J/m | 20–30 J/m |
| HDT at 0.455 MPa | ASTM D648-18 | 50–55 °C | 65–70 °C | 120–130 °C |
| Shore D hardness | ASTM D2240-15 | 74–78 | 76–80 | 85–89 |
The comparison shows why RPU 61 is often selected for housings and fixtures. EPX 82 offers high strength and high thermal stability, but its lower elongation at break and lower notched Izod values make it more prone to brittle crack propagation in thin-walled features. RPU 70 sits close to RPU 61 in stiffness but has lower elongation and higher heat deflection temperature. The selection question is therefore not one of overall superiority but of whether assembly strain or elevated temperature is the limiting design factor.
On Carbon DLS production platforms, RPU 61 is dispensed from twin cartridges through a recirculating system that maintains the resin at a controlled temperature. The uncured liquid has a viscosity that supports high-resolution printing; typical print layer heights for RPU 61 are 25 µm, 50 µm, or 100 µm depending on the part’s surface-finish and build-time requirements. The CLIP process creates an oxygen-inhibited liquid layer that prevents part adhesion to the optical window and enables continuous or semi-continuous build. During this process, RPU 61 green parts have enough strength to retain fine features after removal from the platform, but they remain chemically unfinished until the secondary cure is completed.
Build preparation should avoid fully enclosed cavities unless drain holes of at least 2–3 mm diameter are provided. Trapped uncured resin inside a closed cavity becomes a containment risk during oven cure because the exothermic reaction can generate internal pressure and cause wall rupture or surface cracking. In field audits of failed RPU 61 parts, a recurring root cause was insufficient washing of deep blind holes, leaving residual monomer that cured into a brittle skin and altered the part’s local mechanical response. The washing protocol should therefore use a two-stage solvent bath with agitation and, for small internal channels, positive-pressure flushing.
Thermal post-cure is carried out in a forced-circulation oven with a temperature uniformity of at least ±2 °C across the load. RPU 61 follows a time-temperature protocol within the 100–120 °C band for 2–4 h, with thicker sections held longer to bring the internal material to within 5 °C of setpoint. Under-cure is easily detected by a Shore D reading below 70 or a tensile elongation below 6% on sacrificial coupons. Overheating above 130 °C can lead to oxidative yellowing and embrittlement, with elongation at break dropping below 5% under ASTM D638-14. Production quality systems should include a cure-tracking log, oven temperature mapping study, and weekly tensile or hardness coupon testing because dual-cure polyurethane properties are sensitive to resin lot age, wash solvent quality, and ambient humidity.
Production bottlenecks often occur at the post-cure oven because RPU 61 parts cannot be stacked densely without losing cross-flow uniformity. If parts are packed too closely, the center of the batch may not reach the target cure temperature, while edge parts fully cure, producing batch-to-batch hardness variation. A maximum loading density of 40–50% of oven volume is recommended for forced-circulation ovens, with spacing of at least 25 mm between parts. Temperature mapping of the loaded oven with thermocouples embedded in sacrificial RPU 61 blocks is the most reliable method for qualifying a cure cycle. Lot-to-lot variation in dual-cure resins can also occur due to isocyanate monomer purity and polyol water content. Users should require a certificate of analysis for resin shipments and monitor Shore D hardness of standardized post-cure coupons. A hardness drop of 2 points on the Shore D scale may indicate under-cure or resin aging.
Environmental storage for unprinted resin should be maintained between 15 and 30 °C and protected from moisture ingress. The isocyanate component reacts with atmospheric water; containers left open in ambient conditions above 60% RH may form surface skin and increase viscosity. Printed parts should be post-cured soon after washing. If cured parts are stored in high-humidity environments, moisture absorption remains low, but continuous contact with liquid water at temperatures above 40 °C can reduce tensile modulus by 5–10% over extended exposure.
When Impact-Loaded Snap-Fits, Clips, and Protective Housings Are the Primary Application Targets
RPU 61 is specified for components in which assembly forces and repeated impact events determine service life. Design rules require the snap-fit insertion strain to remain below approximately 5%; higher strains may exceed the material’s yield point and create whitening at the root even if the beam does not immediately break. Wall thickness between 2.0 and 3.5 mm provides a useful balance of stiffness and impact resistance. Thinner walls below 1.5 mm are printable but show a greater scatter in notched Izod results due to layer-boundary effects. Sharp internal corners should be replaced with a root radius of at least 0.5 mm; field studies on DLS polyurethane components identified root radius omission as the most frequent cause of early snap-fit failure.
End-of-arm tooling, robotic gripper jaws, and palletizing fixtures have been produced from RPU 61 in low-volume manufacturing cells. In these applications, components operating at room temperature with localized compressive loads under 20 MPa and maximum service temperatures below 40 °C have shown service lives between 10,000 and 30,000 cycles when inserts are used at bolted connections and the parts are not dropped onto hard edges. Published data for this specific configuration is limited, and users should validate cycle life with instrumented testing rather than extrapolating from general material toughness.
RPU 61 also appears in protective covers for handheld instruments and interior automotive clips. For automotive interior use, the lower heat deflection temperature is acceptable for cabin surfaces that remain below 50 °C, but parts should not be placed near airbag deployment paths, engine-compartment heat sources, or painted panels that undergo bake cycles above 80 °C. The black pigmentation provides some UV protection, but outdoor use exceeding 500 h accelerated weathering under ISO 4892-2:2021 may require a clear coating to prevent yellowing and surface microcracking.
RPU 61 should not be combined with amine-based mold releases, amine-cure epoxies, or strong basic cleaning agents, because residual isocyanate groups on the part surface can react prematurely and produce haze, increased crosslink density, or reduced hardness. For adhesive bonding, solvent-based primers should be screened for compatibility; methyl ethyl ketone and similar ketones can soften or craze the surface. Mechanical fastening with threaded inserts is preferred for applications requiring repeated disassembly because tapped threads in RPU 61 may lose preload after multiple thermal cycles between 20 and 45 °C. For regulated applications, no food-contact, medical, or long-term skin-contact claim is implied by the standard datasheet. Users must determine whether cured RPU 61 meets REACH, RoHS, or FDA 21 CFR 177.1680 requirements under their specific printing, washing, and post-cure conditions, because residual monomer content is process-dependent.
