| HS Code | 532326 |
| Color | White |
| Hardness | 70 Shore D |
| Tensile Strength | 34 MPa |
| Tensile Modulus | 1200 MPa |
| Elongation At Break | 20% |
| Flexural Strength | 50 MPa |
| Flexural Modulus | 1100 MPa |
| Impact Strength | 45 J/m |
| Heat Deflection Temperature | 55 °C |
| Density | 1.10 g/cm³ |
| Water Absorption | 0.4% |
| Glass Transition Temperature | 60 °C |
As an accredited 3D Systems VisiJet RWT-ENT-D70 Multi-Material Composites (VisiJet CR-WT 200** + 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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VisiJet RWT-ENT-D70 Multi-Material Composites are processed as a two-component photopolymer set in which CR-WT 200** supplies rigid structural regions and CE-NT supplies elastomeric regions. Neither material is compounded or diluted downstream. Both cartridges are loaded at 100% solids into the MultiJet printing platform, with no reactive diluent added by the processor. In the application scenarios below, the formulation addition ratio refers to the digitally assigned volume fraction of CE-NT relative to CR-WT 200** in the printed part, not to a liquid mixing operation. Support material is assigned by the build file and removed before UV post-cure.
Segmentation of patient-specific DICOM datasets for preoperative planning requires a single multi-material build that reproduces both cortical bone and compressible soft tissue without post-build assembly. In this application, CR-WT 200** is deposited in osseous regions and CE-NT is deposited in vascular, nerve-sheath, and parenchymal structures. The formulation addition ratio is not a downstream mixing parameter; the digital build file assigns a CE-NT volume fraction typically between 25% and 55% of total part volume, with the balance supplied by the rigid CR-WT 200** component. Compliance standards for hospital-facing anatomical models include ISO 10993-5:2009 for cytotoxicity, ISO 13485:2016 for production quality management, and FDA 21 CFR 820 where the model enters a regulated clinical workflow. The downstream production sequence involves DICOM segmentation, generation of a multi-material 3MF file, MultiJet printing with support material limited to non-functional surfaces, support removal in a warmed bath at 35–45 °C, isopropyl alcohol rinsing, and UV post-cure within the energy range specified by the supplier. The dominant failure mode observed on production lines is support adhesion to thin CE-NT walls; incomplete support removal alters the tactile response of the soft-tissue analogue. Terminal finished product types include craniofacial resection models, transcatheter aortic valve path-rehearsal models, maxillofacial trauma models with elastic soft-tissue boundaries, and orthopedic oncology models where tumor margins are differentiated from healthy tissue by durometer contrast.
For automated assembly lines requiring vacuum gripping, the combination of CR-WT 200** and CE-NT produces end-effector bodies with integral rigid mounting flanges and elastomeric bellows. The formulation addition ratio in this scenario is controlled by the MultiJet job file: the bellows section is maintained at 100% CE-NT by volume, while the mounting flange is 100% CR-WT 200**; the transition zone between flange and bellows is built with interpenetrating voxel phases over a depth of 0.2–0.4 mm. Compliance standards include ISO 9409-1:2004 for robot end-effector mounting interfaces, ASTM D412-16 for tensile properties of the elastomer, ASTM D395-16e1 for compression set after 22 h at 70 °C, and ASTM D2240-15 for durometer verification. The downstream production process requires MultiJet printing with support material only on outer non-contact surfaces, followed by support removal at not more than 45 °C, air-blast drying, and UV post-cure. The operational boundary is dynamic fatigue: CE-NT is a thermoset photopolymer and does not exhibit the same crack-growth resistance as high-consistency silicone rubber. Continuous oscillating bellows applications are therefore limited to low-cycle validation testing unless supplier fatigue data for the specific geometry are available. Terminal finished products include vacuum cup arrays for case packers, bellows grippers for fragile parts, compliant fingers for bin picking, and robot-mounted part nests with rigid datum features.
Low-volume gasket production lines that combine a rigid carrier frame with a continuous elastomeric sealing bead are candidates for the D70 material set when conventional compression-molding tooling cannot be justified for fewer than 100 parts. The CR-WT 200** component forms the compression-limiting carrier, while CE-NT forms the sealing bead at Shore A 70. The formulation addition ratio is a spatial volume ratio: typical seal designs place a CE-NT bead of 1.0–1.5 mm height on a CR-WT 200** carrier with a bead-to-carrier volume ratio between 30:70 and 60:40. Compliance standards include ASTM D395-16e1 for compression set under constant deflection, ASTM D412-16 for tensile strength of the elastomer, ASTM D624-00(2020) for tear resistance, and ISO 3601-1:2012 where O-ring groove dimensions are used as reference. The downstream production process involves importing the seal groove geometry, assigning elastomer and rigid regions, MultiJet printing with support on flat non-sealing surfaces, support removal below 40 °C, solvent cleaning, and controlled UV post-cure. A documented manufacturing constraint is the orientation of concave elastomer sections: horizontal orientation traps support material in the bead root and reduces sealing consistency, so vertical orientation is used despite longer build times. Terminal finished products include flange gaskets with integral compression limiters, rectangular cross-section cord stock with rigid mounting holes, dust boots for linear guides, and vibration isolation pads with integral bolt sleeves.
For wearable device prototyping, CR-WT 200** is used as the rigid housing and lens-mounting frame, while CE-NT forms strap attachment loops, button membranes, and skin-contact cushioning. The formulation addition ratio is controlled by voxel-level material assignment; a typical printed prototype uses a CE-NT volume fraction of 15% to 45% of the finished part, with an overmolded elastomer thickness between 0.8 mm and 2.0 mm. Compliance standards include IEC 62368-1:2023 for audio/video and ICT equipment safety, 2011/65/EU RoHS recast, REACH EC 1907/2006 Article 33 candidate-list screening, ASTM D638-14 for rigid housing tensile properties, and ASTM D624-00(2020) for elastomer tear resistance. Downstream production begins with the CAD overmold interface; the MultiJet build is oriented so that the elastomer-to-rigid interface lies in the XY plane rather than the Z axis to reduce layer-boundary delamination under repeated flexing. Cartridges should be equilibrated to 18–28 °C before printing because condensation on cold cartridges at relative humidity above 60% can introduce surface cure artifacts. Support removal is followed by isopropyl alcohol washing and UV post-cure, with the post-cure dose held constant across the build envelope to prevent durometer drift. The limiting factor for production use is not print resolution but the thermoset nature of CE-NT: it does not melt-reprocess like thermoplastic polyurethane, so end-of-life recycling is not equivalent to injection-molded TPU. Terminal finished products include smartwatch housing prototypes with integrated strap anchors, hearable earbud shell models with soft retention fins, augmented-reality headset facial interfaces, and personal health sensor pods with soft gasketed battery doors.
Clinical orthotic and interface devices requiring rigid external support and distributed elastomeric contact use the two-component architecture of the D70 set. The CR-WT 200** component forms the load-bearing shell, while CE-NT is deposited as an integrated liner with variable wall thickness derived from pressure-mapping data. The formulation addition ratio is assigned per mesh: a forefoot offloading orthosis may use a CE-NT volume fraction as low as 12%, whereas a total-contact prosthetic socket liner prints with CE-NT occupying 55% of part volume, the remainder being CR-WT 200** or an internal lattice of the same rigid material. Compliance standards for non-implantable skin-contact devices include ISO 10993-5:2009 for cytotoxicity, ISO 10993-10:2010 for irritation and skin sensitization, ISO 22523:2006 for prosthetic/orthotic structural test terminology, and ASTM D395-16e1 for compression set of the liner material. The downstream production process starts with optical scanning or plaster-cast digitization, followed by finite-element pressure mapping and multi-material 3MF export. The build is oriented with the elastomer liner face upward to minimize support contact on the skin-contact surface. Support removal below 40 °C, solvent cleaning, UV post-cure, and forced-air drying at 23 ± 2 °C are completed before patient fitting. Terminal finished products include ankle-foot orthosis inner liners, transradial socket test sockets with integrated elastomeric relief zones, metatarsal offloading inserts, and cranial remolding helmet liners.
Automotive interior trim prototyping for soft-key controls and sealing interfaces uses the D70 composite where CR-WT 200** forms the rigid switch bezel and CE-NT forms the tactile membrane and sealing perimeter. The formulation addition ratio is defined by the printed part’s digital material map rather than a liquid mixing ratio; CE-NT typically occupies 10% to 25% of total part volume as a 0.6–1.2 mm membrane, with the bezel body remaining rigid. Compliance standards include IATF 16949:2016 for automotive supplier quality management, ISO 3795:1989 or FMVSS 302 for horizontal burn rate, ASTM D638-14 for rigid bezel tensile properties, and ASTM D412-16 for elastomer tensile set. The downstream production sequence uses Class A surface CAD, multi-material build orientation that places the elastomer membrane parallel to the build platform, MultiJet printing, support removal at 35–45 °C, isopropyl alcohol rinse, UV post-cure, and coordinate-measuring-machine verification of bezel attachment points. The operational boundary for automotive use is heat exposure: CE-NT is a thermoset photopolymer and is not rated for continuous service above its heat deflection temperature, so underhood or direct-sunlight dashboard conditions require supplier thermal aging data. Terminal finished products include HVAC control bezels with integrated button seals, steering-wheel switch pods with soft-touch membranes, door lock bezel prototypes, and center-stack display gaskets.
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3D Systems VisiJet RWT-ENT-D70 Multi-Material Composites is a paired-resin build material set for the ProJet MJP 5500X MultiJet printing system, combining VisiJet CR-WT 200 rigid white and VisiJet CE-NT elastomeric natural to produce a digital material with a nominal Shore A hardness of 70. The designation identifies a two-material workflow rather than a single resin: the CR-WT 200 phase contributes dimensional stability, high modulus, and resistance to bending under load, while the CE-NT phase supplies recoverable strain, low hardness, and improved impact absorption. Parts built with RWT-ENT-D70 therefore occupy an intermediate design space between the neat CE-NT elastomer and the neat CR-WT 200 rigid UV-curable resin, permitting single-build combinations of rigid mounting bosses, flexible hinge zones, and soft sealing surfaces. The material set is not a general-purpose thermoplastic; it is a UV-curable jetted resin system in which layerwise polymerization, support wax removal, and printhead maintenance directly influence the attained durometer and mechanical response.
The product name encodes the blend logic: RWT refers to rigid white, ENT refers to elastomeric natural, and D70 denotes the Shore A durometer target. The two-component configuration is specific to MultiJet Printing platforms that can maintain separate resin reservoirs, isolated delivery lines, and heated printheads for both materials. On the ProJet MJP 5500X, the CR-WT 200 and CE-NT base resins are jetted in successive layers with wax support material, then the support phase is removed at low temperature after printing. Because the elastomeric CE-NT phase has limited elevated-temperature stiffness, support removal for RWT-ENT-D70 parts requires tighter thermal control than support removal for fully rigid CR-WT 200 builds. A printed part that reaches the nominal Shore A 70 value after standard post-processing should still be verified by durometer measurement under ISO 7619-1:2010 or ASTM D2240-15 before acceptance, because lot-to-lot variation in the base resins can shift the effective blend ratio.
Mechanical characterization of the two parent materials provides the most reliable published boundary for specification work. VisiJet CR-WT 200 is a rigid white UV-curable material tested under ASTM D638-14; supplier-reported typical values include tensile strength of 48 MPa, tensile modulus of 2,160 MPa, elongation at break of 8.7 %, and heat deflection temperature of 66 °C at 0.45 MPa. VisiJet CE-NT is an elastomeric natural resin tested under ASTM D412-16; public datasheets commonly report tensile strength of 6.0 MPa, elongation at break of 250 %, tear strength of 13 kN/m, and Shore A hardness of 27. The RWT-ENT-D70 digital blend shifts the Shore A hardness upward to 70, but full tensile and tear data for the blended configuration are less consistently published than data for the parent resins. Procurement controls should therefore require lot-specific certification against ISO 7619-1:2010 durometer testing and ASTM D412-16 tensile elongation rather than relying solely on the D70 product label.
| Material or Condition | Test Method / Reference | Reported Boundary |
|---|---|---|
| VisiJet CR-WT 200 tensile strength | ASTM D638-14 | 48 MPa |
| VisiJet CR-WT 200 tensile modulus | ASTM D638-14 | 2,160 MPa |
| VisiJet CR-WT 200 elongation at break | ASTM D638-14 | 8.7 % |
| VisiJet CE-NT tensile strength | ASTM D412-16 | 6.0 MPa |
| VisiJet CE-NT elongation at break | ASTM D412-16 | 250 % |
| RWT-ENT-D70 nominal Shore A hardness | ISO 7619-1:2010, ASTM D2240-15 | 70 |
| Conditioning atmosphere | ISO 291 | 23 ± 2 °C, 50 ± 5 % RH |
The primary difference from neat VisiJet CE-NT is the stepwise increase in Shore A hardness and the associated reduction in recoverable elongation. Neat CE-NT is a soft elastomer with a durometer near 27 Shore A; in service it can follow irregular mating surfaces but may deflect excessively when a clamp load or internal pressure is applied to a large unsupported area. RWT-ENT-D70 increases the durometer to 70 Shore A while retaining enough flexibility for gasket-like conformance and low-strain vibration absorption. The trade-off is that flexural fatigue life and cut growth resistance differ from the neat elastomer; parts should be tested under ASTM D412-16 for tensile properties and under ASTM D624-00 for tear resistance when repeated flexure is expected.
The primary difference from neat VisiJet CR-WT 200 is the loss of high tensile modulus and thermal deflection temperature in exchange for recoverable compliance. CR-WT 200 is suitable for rigid snap-fit prototypes and dimensionally stable housings, but its low elongation makes it unsuitable for living hinges that require repeated bending or for seal faces that must conform to mating surfaces. The RWT-ENT-D70 blend reduces stiffness and increases elongation relative to CR-WT 200, allowing a single build to combine rigid and compliant regions without adhesive bonding or secondary overmolding. However, the blended material does not match the abrasion resistance, creep resistance, or high-temperature performance of filled rigid MJP resins. When a design requires tensile modulus above 1,000 MPa, CR-WT 200 is more appropriate; when a design requires a Shore A durometer below 50, neat CE-NT or a softer digital blend is more appropriate.
In jetted multi-material processing, the blend ratio is not actively mixed in a vat or barrel. The effective ratio depends on printhead drop volume, reservoir temperature, material lot viscosity, and purge consistency. If the CE-NT elastomer lot shifts to a higher viscosity at jetting temperature, accumulator fill time increases, layer-to-layer planarity can degrade, and the local Shore A hardness can drift because the effective rigid/soft ratio changes even when the software ratio remains fixed. Batch-to-batch variation in CE-NT base resin can produce Shore A variation of as much as 5 points if the machine is not recalibrated after material lot changes. Operators should log reservoir temperature, fill time, vacuum level, and purge counts at the start of each shift, and printed hardness plaques should be tested under ISO 7619-1:2010 before production builds are released.
Post-processing is the principal process window for RWT-ENT-D70 parts. Because the CE-NT phase loses stiffness at moderately elevated temperatures, support wax removal must remain below the published rigid-resin bakeout limit. The manufacturer’s process guidance for elastomeric composites requires low-temperature wax removal; oven settings above 40 °C can introduce dimensional relaxation, especially in thin walls below 2 mm thick. On a ProJet MJP 5500X, the support removal bath temperature should be monitored with an immersion thermocouple rather than the machine controller alone, because localized heating elements can overshoot the setpoint and create soft-phase distortion before the operator observes a fault. After wax removal, residual support material in blind channels or narrow slots should be cleared with compressed air at pressures below 2 bar; higher pressures can delaminate the soft phase from the rigid phase at layer interfaces.
Build orientation affects RWT-ENT-D70 more than neat CR-WT 200 because the soft CE-NT-rich phase has lower layer-to-layer fusion strength. X–Y printed tensile specimens generally give higher elongation and tear resistance than Z-oriented specimens, especially when large soft regions are stacked vertically. For functional gaskets, bellows, and overmoulded grips, the flexible hinge plane should be aligned with the X–Y build plane, and rapid thickness transitions should be beveled across at least 3 layer heights to reduce stress concentrations at the rigid-soft interface. If a production part requires Z-axis compliance, printed validation coupons should be tested under ASTM D412-16 after the same support removal and conditioning procedure used for production. Direct comparison of X–Y and Z specimens is required because published data for Z-axis-specific behavior in this blended configuration is limited.
Thin-wall sections below 1.5 mm are vulnerable to tear propagation when the soft phase is loaded perpendicular to the layer plane. In service, a compression seal with a very thin flexible lip may survive initial assembly but fail after repeated load because layer interfaces in the elastomeric phase act as crack initiation sites. For seal prototypes, a minimum lip radius of 0.5 mm and a compression deflection no greater than 25 % are practical starting points, with verification by compression set testing under ASTM D395-18. The measured compression set of a blended RWT-ENT-D70 part should be compared against the neat CE-NT baseline; a significant increase indicates that the rigid phase is interfering with elastomeric recovery, not simply increasing hardness.
Typical part classes for RWT-ENT-D70 include overmoulded hand grips, dust boots, gasket prototypes, face seals, vibration isolators, and low-pressure fluid-path covers in which the CR-WT 200 regions provide mounting bosses and the CE-NT-rich regions provide the sealing surface. The material is not a replacement for high-temperature fluoroelastomer seals; continuous exposure to hot oils, amines, or strong solvents can alter the elastomeric phase and reduce Shore A retention. For medical or food-contact applications, confirm specific grade compliance with ISO 10993-5 or FDA 21 CFR 177.2600 as applicable, because the base datasheet alone does not establish biocompatibility.
Shipping and handling documentation for the two-component set should be audited against the current 3D Systems safety data sheet. The uncured resins are chemical products; nitrile gloves and local exhaust are typical controls, but operators should verify exposure limits in the SDS rather than relying on generic precautions. The material is not a commodity thermoplastic; it is a UV-curable jetted resin set with defined storage life and light-exclusion requirements. Resin containers should be stored at 15–27 °C and shielded from ultraviolet and blue light. Repeated opening without purging can introduce moisture or degrade photoinitiator activity, altering jetting viscosity and the D70 hardness response. Before insertion into the ProJet MJP 5500X, each container should be inspected for gel particles, phase separation, or white precipitate that would indicate lot instability.
Regulatory documents for VisiJet CR-WT 200 and CE-NT should be reviewed for REACH and RoHS status on a regional basis. The presence of one base material on a compliance list does not automatically confer the same status to the combined RWT-ENT-D70 workflow. When a declarable substance threshold is critical, the final part should be tested in the as-built and post-processed state because support wax residues can contribute extractable material. If the application involves prolonged skin contact, obtain independent skin sensitization data under the appropriate OECD test guideline or request a statement from the resin manufacturer; the mechanical datasheet does not provide a toxicological assessment.
The principal operational boundary for RWT-ENT-D70 is the combined effect of elevated temperature, ultraviolet exposure, and mechanical load. The CE-NT phase is not a heat-cured rubber and can soften more readily than injection-moulded thermoplastic elastomers when exposed to temperatures above 50 °C under continuous stress. Parts used in engine compartments, autoclave trays, or hot industrial enclosures should be evaluated for creep and compression set under the actual service temperature. A Shore A verification after 168 h of thermal exposure at the intended upper service temperature is a more meaningful acceptance test than an immediate durometer reading. If the part loses more than 10 Shore A points after exposure, the service environment is outside the practical boundary for the blended material.
The principal difference from continuously variable multi-material elastomer systems is that RWT-ENT-D70 is delivered as a preselected blend target rather than a fully tunable mixing range. Changing the blend ratio without revalidating the durometer, tensile response, and support removal behavior moves the part outside the published D70 specification. Because the product is defined by the interaction of two base resins, process verification must be performed on the same machine, with the same material lots, and through the same post-processing path used for production. A printed reference plaque with a minimum thickness of 6 mm should accompany each new lot and each maintenance cycle to confirm that the delivered hardness remains within the 70 Shore A target band under ISO 7619-1:2010.
