| HS Code | 258502 |
| Product Name | 3D Systems VisiJet RBK-ENT-A90 Multi-Material Composites (VisiJet CR-BK + VisiJet CE-NT) |
| Material Type | Multi-Material Composite |
| Composition | VisiJet CR-BK + VisiJet CE-NT |
| Color | Black |
| Hardness | 90 Shore A |
As an accredited 3D Systems VisiJet RBK-ENT-A90 Multi-Material Composites (VisiJet CR-BK + VisiJet CE-NT factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
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In consumer electronics enclosure programs, the two resin channels of VisiJet CR-BK and VisiJet CE-NT are loaded into separate heated reservoirs of a 3D Systems ProJet MJP 2500 Plus, and the RBK-ENT-A90 composite build style assigns CR-BK voxels to battery-mount bosses, snap-fit walls, and connector alignment features while CE-NT-rich voxels form sealing ribs, button diaphragms, and corner impact zones. The formulation addition ratio in this scenario is not a post-hoc compounding step; it is a CAD-layer-controlled volumetric ratio set in the job preparation software, with 70–85 vol% CE-NT used in sealing-rib and button-diaphragm zones and 0–30 vol% CE-NT used in rigid latch walls and screw bosses. Downstream production proceeds through MJP deposition, followed by wax support removal in a dedicated melt-out station and detergent washing with low-temperature forced-air drying before assembly. Terminal finished products include single-piece wearable monitor cases with integrally printed gasket lips, charging-port plugs, and tactile elastomer keypads, eliminating separate overmold tooling. Compliance requires verification of restricted substances under RoHS 2011/65/EU Annex II and candidate-list substances under REACH Article 57; linear tolerance capability is assessed according to ISO 286-2, and compression set of CE-NT-rich zones is evaluated per ASTM D395 Method B after 22 h at 70 °C. A processing limitation is that CE-NT-rich elastomer sections exhibit greater compression set than molded thermoplastic elastomers, requiring thicker gasket cross-sections and a design review before functional sealing tests. Published batch-specific data for this configuration is limited, so supplier certificates must be obtained before design freeze.
Low-volume automotive wire harness clip and grommet assemblies rely on the same digital composite to combine CR-BK rigid snap-tangs with CE-NT elastomeric strain-relief boots in one print job. In this application the material addition ratio is distributed across the part: the grommet bellows typically use 80–100 vol% CE-NT, the transitional fillet between boot and clip base uses 50–70 vol% CE-NT, and the clip base uses 0–20 vol% CE-NT, creating a digital gradient without adhesive bond lines. Production uses an MJP 3000-class platform with dual material jets and wax support; post-processing includes heated support wax removal at 65–70 °C, followed by a detergent wash cycle and forced-air drying at 40–50 °C before insertion testing. Terminal finished parts are small-batch harness clips, integrated grommet boots, and strain-relief collars used for functional validation rather than high-volume injection tooling. Compliance for automotive interior use is assessed under VDA 275 odor testing and ISO 188 heat aging at 80–90 °C for 500 h; elastomer hardness variance after aging is measured with ASTM D2240 Type A, and heavy-metal reporting follows the current version of ELV Directive 2000/53/EC with IMDS entry. The main processing risk is differential UV polymerization shrinkage between CR-BK rigid sections and CE-NT elastomer sections at sharp material boundaries; a transition zone of at least 1.0–2.0 mm is required to prevent interfacial stress concentrations and crack initiation during clip insertion. Published quantitative shrinkage differentials for RBK-ENT-A90 are limited, so CT or sectioned coupon inspection should be performed when initial sample batches show localized separation at the rigid-elastomer transition.
The processing window for integrated pneumatic gripper fingers becomes critical when internal air channels are formed between a CR-BK rigid mounting flange and a CE-NT-rich external flexure. In this configuration, the formulation addition ratio is defined as the volumetric percentage of CE-NT in the composite voxel grid; a distribution for a 70–90 Shore A gripping face typically uses 65–85 vol% CE-NT in the contact pad and 0–10 vol% CE-NT in flange bolt holes, while the flexure hinge is digitally graded from 50 vol% on the rigid side to 90 vol% on the pad side. Builds are executed on a ProJet MJP 2500 Plus or larger MJP system with high-density part stacking; support wax removal from internal channels is the main throughput bottleneck, requiring heated immersion at 65–70 °C for 4–8 h depending on channel cross-section, followed by ultrasonic detergent cleaning and compressed-air blowout. Narrow internal channels below 1.0 mm can retain wax and cause pressure loss or contamination, a failure mode observed on production-scale post-processing lines. The terminal parts are monolithic pneumatic fingers used in low-force pick-and-place tooling for electronics assembly and packaging inspection cells. Compliance for compressed-air contact surfaces requires evaluation against the relevant particulate and oil classes of ISO 8573-1; mechanical properties are anchored to ISO 37 tensile specimens and ASTM D624 die C tear specimens printed in the same build orientation. Shore A hardness of CE-NT-rich zones is tested per ISO 7619-1:2022 with a durometer calibrated to ASTM D2240 Type A. Published data for this specific configuration is limited, especially after cyclic air pressurization beyond 0.5 MPa; long-term flex fatigue should be validated with custom end-user fatigue protocols rather than a single standardized test alone.
Fluid-handling manifolds and valve bodies for laboratory automation are printed with CR-BK as the structural substrate and CE-NT as integral soft-seat sealing elements, eliminating separate O-ring assembly steps. The digital material ratio in the seat region is typically 90–100 vol% CE-NT; the surrounding plateau is 0 vol% CE-NT; and a transition band of 1.0–2.0 mm may be assigned a gradient from 10 vol% to 90 vol% to reduce stress concentration at the seat edge. Downstream production uses high-resolution MJP mode to preserve seat flatness and edge definition, with wax removal conducted in a dedicated melt-out unit at 65–70 °C, followed by solvent-free detergent cleaning and inspection of seat surfaces. Critical process control includes orienting seat faces perpendicular to the build axis to minimize stair-stepping artifacts on sealing surfaces; parts with vertical seat faces may require additional finishing that reduces dimensional precision and complicates the sealing standard. Terminal finished products include manifold blocks for low-pressure fluid delivery up to 0.5 MPa, pipette tip adapters, and microvalve bodies for laboratory instruments. Relevant compliance standards include EN 61010-1:2010/A1:2019 for laboratory equipment safety, with chemical compatibility screened according to ASTM D543-21 using representative liquids such as ethanol, sodium hypochlorite, and phosphate-buffered saline. Hardness is confirmed with ISO 7619-1:2022, and compression set is assessed per ISO 815-1:2019 at 70 °C for 24 h. The working limit is chemical swell: hydrocarbon and ester solvents can soften CE-NT-rich zones and reduce seating force; end users must validate target fluids against the material-specific datasheet and should avoid exposure to strong acids, amines, and chlorinated solvents. Published chemical-resistance data for RBK-ENT-A90 is limited, and no broad compatibility statement is made without application-specific testing.
Building a wearable sensor enclosure from two photopolymer channels begins with assigning CR-BK to the battery compartment and sensor alignment features while CE-NT-rich zones produce skin-contact pads, water-resistant gasket lips, and button covers. The formulation addition ratio is divided between rigid and flexible voxel populations: skin-contact surfaces at 80–100 vol% CE-NT, compression gasket features at 60–85 vol%, retention walls at 0–10 vol%, with the host software interpolating composite hardness between specified control points. Downstream production uses a 3D Systems MJP platform with wax support removal and detergent washing; post-processing may include a low-temperature dry cycle at 40–50 °C to stabilize dimensions before sealing-force measurement. Terminal products are functional wearable sensor housings for pilot runs, fit validation, and clinical usability studies rather than mass production. For skin-contact devices, compliance requires a biological evaluation plan per ISO 10993-1:2018; if the device is non-contact or brief contact, cytotoxicity testing per ISO 10993-5 and irritation or sensitization testing per ISO 10993-10 are typical starting points. Published data for this specific configuration is limited; the biocompatibility of the supplied VisiJet CE-NT and CR-BK resins must be confirmed through the manufacturer’s certification package before clinical evaluation. Mechanical performance is anchored to ISO 527-2 for rigid CR-BK tensile properties and ISO 37 for CE-NT-rich elastomer zones; enclosure leakage is tested by IP67 methods under IEC 60529 using a vacuum or pressure differential. The main operational boundary is residual wax in small gasket channels and the potential for CE-NT-rich zones to retain detergent from cleaning; conductivity and skin compatibility assessments should be performed only after complete drying.
For orthotic shell prototyping, the same digital composite is used to print CR-BK structural shells with CE-NT cushioning pads or posterior heel zones in a single build. The digital material ratio is selected zone by zone: load-bearing arch structures use 0 vol% CE-NT; anterior cushion regions use 50–70 vol%; heel pads use 80–95 vol%; and the transition perimeter is assigned a gradient of 1.0–2.0 mm to minimize shear stress at material interfaces. Production builds are completed on an MJP 2500 Plus or larger machine, with support material removed by melt-out and detergent washing. Since orthotic devices require continuous skin contact and repeated loading, post-processing includes a documented wash protocol to remove support residues and a disinfection process compatible with the materials’ temperature limits, such as 70% ethanol wipes or validated ethylene oxide exposure. Terminal output includes custom-fit orthotic insoles with rigid arch support and elastomeric heel cushioning for clinical evaluation and patient-specific functional fittings. Compliance for these devices is anchored to ISO 22523:2006 for external limb prostheses and orthoses, with mechanical characterization by ISO 527-2 and tear resistance by ASTM D624. Hardness of cushion zones is measured using ASTM D2240 Type A; static coefficient of friction against leather or textile test surfaces is evaluated per ASTM D1894-14 if slip resistance is part of the design requirement. A known limitation is the long-term abrasion of CE-NT-rich surfaces under repeated gait cycles; weight-bearing prototypes should be inspected for surface cracking and loss of cushioning after 100,000 cycles, using a protocol derived from ISO 22675 fatigue testing unless the end user specifies an alternative validation sequence.
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3D Systems VisiJet RBK-ENT-A90 Multi-Material Composite (VisiJet CR-BK + VisiJet CE-NT) is a photopolymer composite output produced by the MultiJet Printing process on the ProJet MJP 5500X platform. The designation encodes the constituent set: RBK identifies the rigid black component, ENT identifies the elastomeric natural component, and A90 identifies the target durometer of the final composite under ASTM D2240. The material is not supplied as a premixed resin; the two feedstocks are selectively jetted and UV-cured at the voxel level to produce a final part with spatially controlled mechanical behavior. This creates a two-phase printed material system rather than a single homogeneous plastic or elastomer. The product is intended for functional prototypes and short-run production where an elastomeric component must withstand higher compressive load than standalone VisiJet CE-NT while retaining flexural recovery and tear resistance. Mechanical characterization is performed on printed specimens after conditioning at 23 °C and 50% RH. The relevant test standards include ASTM D638 for tensile properties, ASTM D624 for tear strength, ASTM D395 for compression set, and ASTM D792 for density. Because the composite contains a rigid photopolymer phase, its tensile curve is not identical to a homogeneous cast elastomer of the same durometer; users should consult the manufacturer’s datasheet for orientation-dependent values.
| Property | Standard method | Reported basis |
|---|---|---|
| Hardness | ASTM D2240 | Shore A 90 |
| Tensile stress | ASTM D638 or ASTM D412 | orientation-dependent, printed specimen |
| Elongation at break | ASTM D638 or ASTM D412 | orientation-dependent |
| Tear strength | ASTM D624 | die C, orientation-dependent |
| Compression set | ASTM D395 | time, temperature, and geometry dependent |
| Density | ASTM D792 | manufacturer datasheet |
A cast urethane or silicone system at Shore A 90 has a homogeneous chemistry, and its hardness is controlled by prepolymer stoichiometry and plasticizer content. RBK-ENT-A90 differs because the final material is an array of cured droplets whose local mechanical response depends on the ratio of rigid black to elastomeric natural in each printed voxel. This allows one build to contain a rigid mounting flange and an elastomeric diaphragm without a secondary adhesive bond line. Overmolded parts can achieve a similar product geometry, but the overmolding interface is formed by melt adhesion and mechanical locking after the substrate has been processed. The MJP interface is produced layer-by-layer from the same digital file, so no mold release agent or primer is present at the transition. In production troubleshooting, bond-line delamination in overmolding is often linked to surface contamination or a cold mold. The MJP transition zone is instead influenced by slice file resolution, inkjet drop placement accuracy, and UV cure dose. Published comparative data between MJP composite transitions and insert overmolding is limited, so substitution should be validated by destructive tensile pull tests on printed representative joints rather than by durometer alone.
On the ProJet MJP 5500X, the two cartridges remain isolated until the printhead. The platform maintains each material at its specified printhead temperature because VisiJet CR-BK and VisiJet CE-NT have different viscosity-temperature responses. A single-resin MJP system cannot produce the RBK-ENT-A90 composite because it lacks the dual-path jetting architecture required for voxel-level material control. Operators must load both cartridges and confirm that the machine profile for the A90 composite is active. Manual adjustment of printhead voltage, UV intensity, or build chamber temperature is generally restricted by the system firmware. Deviation from the default parameters can alter droplet coalescence and reduce the mechanical stability of the rigid-elastomeric transition. Batch-to-batch viscosity variation is normally controlled by the material manufacturer, but irregular cartridge storage can cause localized gel particle formation. The fluid path should be purged according to the platform maintenance schedule when moving from another material set, and the printhead nozzle plate inspected for partially cured deposits. Production environments with ambient temperatures outside the recommended range may observe differences in support wax adhesion and part dimensional stability because the printed material is sensitive to temperature during the build and during the initial cool-down phase.
If an assembly requires a rigid substrate and a soft seal lip, the ProJet MJP 5500X can digitally combine rigid black and elastomeric natural to create a graded interface. The A90 grade is selected when the soft region must resist excessive deflection under fluid pressure or mechanical load while still recovering after repeated cycles. The local ratio of the two materials is not a user-adjusted parameter at the machine panel; it is encoded in the part file and produced by the printer’s slice engine. This differs from single-part VisiJet CR-BK or VisiJet CE-NT printing, where every voxel is the same resin. It also differs from a multi-step casting process where the first cured layer must be fully formed before the second material is introduced. In the MJP approach, the transition from hard to soft may be blurred across several layers rather than sharp. The thickness of that transition depends on print resolution and the degree of oversampling used at the boundary. Designers should not treat the transition as an instantaneous material change; it should be modeled as a short gradient with intermediate stiffness values. Mechanical data for the bulk A90 composite does not capture this gradient unless the datasheet specifically reports interface test coupons.
Support removal after MJP builds requires a heated wax-removal operation followed by a rinse stage. In the ProJet MJP 5500X workflow, the dedicated support material is removed from the part by melting and dissolution. Residual support wax trapped in thin channels or blind holes is then removed by an approved solvent rinse or ultrasonic cleaning. The CE-NT phase is more susceptible to solvent uptake than the CR-BK phase. Thin elastomeric walls below 2 mm in cross-section may show temporary thickness expansion after prolonged solvent exposure. The post-processing parameter set should be fixed for a given geometry: wax-removal temperature, rinse time, ultrasonic frequency, and drying time should be recorded because variation can alter the final mass and Shore A reading. After support removal, parts should be conditioned at 23 °C and 50% RH for the manufacturer’s recommended minimum period before mechanical testing. Water or alcohol retained in the CE-NT phase can plasticize the surface and lower apparent hardness. For parts with internal lattices or complex undercuts, the wax-removal time may need to be extended, but this extension increases the solvent exposure risk for the elastomeric phase. Production lines typically use a staged process: initial wax melt, rinse, air blow-off, then a temperature-controlled drying step. Batch records should include the support-removal station temperature and the immersion time for traceability.
The two-phase structure creates a more complex solvent response than a single-part photopolymer. The rigid black phase may resist short-term contact with weak acids and bases, while the elastomeric natural phase can swell in low-polarity oils and solvents. Published compatibility data for the exact RBK-ENT-A90 composite is often limited to common industrial fluids; for unlisted fluids, immersion testing under ASTM D471 should be performed on printed parts rather than on cast sheets. The test duration, temperature, and fluid composition should match the intended service environment. A solvent that does not attack either phase separately may still cause distortion at the phase interface if uptakes differ, generating internal stress. Elevated temperature compounds this effect: above approximately 40 °C the elastomeric phase becomes more susceptible to creep and compression set. Compression set testing under ASTM D395 at the intended service temperature is required for seal applications. Prolonged exposure to ultraviolet light can cause further curing of residual photoinitiator and surface yellowing, particularly in the natural elastomeric regions. The product should not be used for continuous high-temperature service or for contact with strong polar solvents without validated compatibility data.
Typical applications include short-run gaskets, dust boots, bellows, cable grommets, protective covers for robotic end-effectors, and grips for hand-operated tools. In these applications, the A90 composite provides higher stiffness than the soft CE-NT material while maintaining enough elastic deformation to seal or absorb vibration. The material is a thermoset photopolymer system after curing and cannot be reground or remelted like a thermoplastic elastomer. Compliance statements should be obtained from the manufacturer for REACH and RoHS. The product is not routinely supplied with food-contact or medical certifications; if those requirements are necessary, the application must be reviewed against the exact grade and post-processing conditions. Material safety data sheets cover the liquid feedstock, not the fully cured composite. When printing parts for electrical enclosures, the dielectric properties of the composite should be measured on printed specimens at the required thickness and frequency; data for the dried bulk material may not represent the as-printed condition with residual support wax or moisture. Robotic end-effectors often use the material for protective pads because the build can be produced without hard tooling; however, production quantities above a few hundred parts may favor transfer molding or cast polyurethane due to cycle time and material cost. The MJP process is suited for parts with complex internal channels and undercuts, but the support removal process must be capable of draining wax from such channels.
Compared with standalone VisiJet CE-NT, the RBK-ENT-A90 composite shifts the durometer to Shore A 90 and reduces the maximum elongation usually associated with a soft elastomer. Compared with VisiJet CR-BK, the composite lowers tensile modulus and heat deflection behavior while increasing elastic strain capacity. The product occupies a middle position in the multi-material elastomer family: it is intended for applications that require more structural support than a very soft elastomer but cannot accept the rigidity of a hard black part. Because the product is generated from two base materials, its price, build time, and post-processing requirements are not equivalent to a single-material MJP part. Multi-material builds may require more careful cleaning of the printhead and more rigorous validation of the transition zone. The final application test program should include tensile, tear, compression set, and fluid compatibility tests on parts built in the intended orientation, using the same post-processing sequence that will be used in production. This is necessary because oriented jetting layers and residual cure gradients can produce mechanical anisotropy that bulk material data sheets do not capture.
