In the 3D Systems VisiJet RWT-ENT-A40 Multi-Material Composites product designation, the orderable material set comprises two co-printed phases identified as VisiJet CR-WT 200** and VisiJet CE-NT. The model code RWT-ENT-A40 is used by 3D Systems as a multi-material composite identifier within the VisiJet family; it is not a single-resin designation. Published data for the final co-printed state of this specific configuration is limited because the composite properties depend on the print mode, layer thickness, orientation, and post-processing history selected on the MultiJet Printing equipment. When hardness targets in the Shore A40 range are referenced, ASTM D2240-15 provides the accepted method for lot acceptance of the CE-NT phase; the rigid CR-WT 200** phase is more appropriately characterized under ASTM D638-14 and ASTM D790-17. The material pair is typically handled in sealed cartridges and requires a multi-channel material-jetting printer with independent reservoir and printhead thermal control. On such platforms, the two phases are jetted through separate high-density nozzle arrays, merged at the voxel level, and planarized by a roller to establish layer thickness. The presence of two chemistries in one build makes material temperature stabilization, jet-health monitoring, and post-processing control more constrained than in single-material VisiJet operations.

How Does the CR-WT 200** Phase Differ from a Conventional Wax Support or Single-Material Rigid Resin?

The CR-WT 200** material is not a conventional casting wax. In the RWT-ENT-A40 pairing, it functions as a white rigid composite phase that contributes dimensional accuracy and high-modulus regions to the final article. That behavior differs from a sacrificial wax support formulated only for clean melt-out or dissolution; if CR-WT 200** is used as a removable phase in a given build layout, the removal path must still be tailored to the co-present CE-NT elastomer. Generic wax-pattern oven recipes are not transferable because the upper temperature limit is governed by the softer phase, not by the melt profile of the rigid component alone. The rheological match between the two phases is the primary processing requirement. Material-jetting printheads typically require melt viscosities in the 10–14 mPa·s range at jetting temperature; the RWT-ENT-A40 pair is formulated within this class, but cartridge-specific set points must be read from the current 3D Systems material handling guide. In contrast to single-material VisiJet M2R-WT or M2R-CL processing, the two active channels create a true voxel-level interface. That interface must be validated after post-processing rather than inferred from bulk resin data. Comparative tensile specimens printed perpendicular and parallel to the rigid-elastomer boundary and tested under ASTM D638-14 provide an accepted method for detecting interfacial weakness before committing to production geometry.

Production-scale behavior of the RWT-ENT-A40 pair concentrates risk at the rigid-elastomer interface and at the printhead maintenance boundary. On multi-material MJP lines using a planarizer roller, aerosolized droplets from the lower-viscosity phase can accumulate on the roller surface and modify the deposited layer thickness. The resulting defect is often masked by the white rigid phase and is not visible on the as-printed surface; it appears after support removal as intermittent soft zones, sub-surface voids, or interfacial delamination. Jet-check routines must therefore be run at the interval defined by the printer manufacturer, and the wiper, roller, and waste-tray absorbent condition must be treated as process variables rather than afterthoughts. Cartridge conditioning is similarly critical. Cold material introduced into a heated ink path produces a transient viscosity spike that changes droplet trajectory, increases satellite formation near the nozzle face, and can result in missing CE-NT voxels. Retained witness coupons from each cartridge batch should be printed, conditioned for 40 h at 23±2 °C and 50±5 % RH per ASTM D618-21, and tested under ASTM D2240-15 for durometer or under ASTM D638-14 for tensile modulus. Batch-to-batch variation in the elastomer phase typically appears as a Shore hardness shift or as a change in interfacial tearing behavior, and both are process-control signals rather than cosmetic anomalies.

When Post-Processing Requires Thermal Removal Without Exceeding the Elastomeric Phase Limiting Temperature

Thermal post-processing for the RWT-ENT-A40 pair is a two-phase thermal problem. The lower bound of the removal window is set by the melting or softening response of the removable phase, while the upper bound is set by the dimensional stability and compression-set resistance of the CE-NT elastomer. Ovens used for support or rigid-phase removal should be equipped with closed-loop temperature control and calibrated probes that verify work-zone uniformity. Generic industrial wax ovens with broad temperature overshoot are not suitable without qualification because a short excursion above the CE-NT limiting temperature can produce permanent distortion, interfacial microcracking, or a change in the elastomer phase crosslink density. Post-removal solvent exposure is governed by a different constraint. Solvent immersion is not a direct substitute for thermal removal unless the cleaned composite has been tested under ASTM D543-20 for the specific solvent, immersion time, and temperature. The CE-NT phase may swell in polar solvents or ketones, and swelling imposes tensile stress at the printed boundary. That stress can exceed the interfacial adhesive strength and produce delayed delamination. Heated bath removal should also be validated with representative parts, not flat coupons alone, because solvent access, drainage, and thermal mass vary with geometry.

Unlike single-material VisiJet M2R-CL or M2G-DUR build strategies, the RWT-ENT-A40 pair requires separate property tracking for the rigid phase, the elastomer phase, and the interface. A single tensile value for the whole composite is insufficient because the stiff phase dominates initial modulus and masks soft-phase compliance drift. Procurement specifications should request separate certificates or datasheet values for the rigid CR-WT 200** phase and the CE-NT elastomer phase. Tensile evaluation of the rigid phase is commonly conducted under ASTM D638-14; the elastomer phase may be characterized under ASTM D412-16 or ASTM D638-14 depending on elongation at break, while hardness is reported under ASTM D2240-15. The multi-material strategy also changes the support and purge philosophy. In single-material VisiJet operations, the second channel is often dedicated to a non-functional support resin that is removed in a single operation. In the RWT-ENT-A40 set, the second channel can serve a functional phase in selected layouts, but that benefit increases the need for continuous nozzle-sealing control, idle jetting maintenance, and dual-channel purge discipline. Gray-scale polymer-jetting platforms vary compliance by mixing resin streams in programmable ratios before jetting; the RWT-ENT-A40 set is built around discrete co-jetting of two distinct phases in separate channels. The exact voxel-level phase boundary is therefore determined by the print control file, orientation, and slice geometry rather than by an assumed global mixing ratio inferred from the product name.

Regulatory and Test-Method Matrix for the RWT-ENT-A40 Pair

For incoming material qualification and process audits, the following matrix identifies applicable standard methods and specimen-level considerations. The table does not state measured values for the product; it establishes the test frame required to compare lots, phases, or process changes under controlled conditions.

Operational boundaries for the product are derived from phase-specific chemistry rather than a single resin datasheet. Uncured cartridges should be stored sealed and conditioned to room temperature before installation; an environment above 60 % RH can introduce moisture that affects film quality and may require additional cartridge drying or build-chamber humidity control. The CE-NT phase should be considered incompatible with strong polar solvents, ketones, and amine-containing cleaning agents until compatibility is demonstrated under ASTM D543-20 on representative cleaned geometry. The rigid phase should not be treated as having the same melt-removal window as historical wax supports or other VisiJet support resins; oven programs for other product pairs are not transferable unless the current 3D Systems document package for RWT-ENT-A40 explicitly authorizes the substitution. Repeated thermal cycling can shift the interface; articles used for repeated simulation, teaching, or iterative assembly should be inspected at phase boundaries under low-magnification microscopy and, where required, sectioned for hardness mapping. No load-bearing or implantable medical use should be inferred from the model-code suffix or from the Shore A40 reference. Final article performance is established by the user under the relevant ASTM or ISO methods and application-specific acceptance criteria.