| HS Code | 306792 |
| Product Name | 3D Systems Accura 40 Plastic for SLA Systems |
| Material Type | Stereolithography resin |
| Color | Translucent amber |
| Density | 1.12 g/cm³ |
| Tensile Strength | 45 MPa |
| Tensile Modulus | 2,600 MPa |
| Elongation At Break | 8% |
| Flexural Strength | 70 MPa |
| Flexural Modulus | 2,400 MPa |
| Notched Izod Impact | 20 J/m |
| Hardness | 85 Shore D |
| Heat Deflection Temperature At 0 45 Mpa | 55 °C |
| Heat Deflection Temperature At 1 82 Mpa | 50 °C |
| Glass Transition Temperature | 60 °C |
| Water Absorption | 0.35% |
| Dielectric Constant At 1 Mhz | 3.5 |
| Dielectric Strength | 15 kV/mm |
As an accredited 3D Systems Accura 40 Plastic for SLA Systems factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Accura 40 Plastic for SLA Systems comes in a 1 kg opaque plastic bottle with secure screw cap and safety label. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized 3D Systems Accura 40 Plastic for SLA Systems, secured and labeled for regulated chemical transport. |
| Shipping | Accura 40 Plastic for SLA Systems ships as a photosensitive liquid resin in sealed, opaque, upright containers. It is typically not classified as hazardous for transport under DOT/IATA/IMDG. Store away from heat, UV light, and ignition sources; include SDS and handle with appropriate PPE. |
| Storage | Store 3D Systems Accura 40 Plastic in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, and flames. Keep containers tightly closed and upright in the original packaging. Avoid freezing and extreme temperatures. Store separately from strong oxidizers, food, and drink. Protect from ultraviolet light. Limit access; use appropriate PPE and follow SDS requirements. |
| Shelf Life | Shelf life is 12 months from date of manufacture when stored in original unopened containers at 20–25°C, away from light. |
Lost-wax and lost-polymer investment casting trials using Accura 40 patterns are generally restricted to foundries that can verify residual ash from the specific resin lot against an internal burnout protocol, because 3D Systems does not publish a certified ash-content figure for this general-purpose photopolymer. The applicable pattern-material verification framework is based on ASTM D638-14 and ASTM D790-17 for tensile and flexural characterisation, with dimensional conformance assessed under ISO 8062-3 for as-cast tolerances and ISO 9001:2015 for foundry process control. The resin is charged into the stereolithography vat as a single-component photopolymer at 100 wt% of the liquid feedstock; no reactive diluent, filler, or secondary binder is added because inorganic particulates would raise the burnout residue above the threshold acceptable for shell integrity and radiographic cleanliness. In a representative pattern-making sequence, the part is oriented at 30–45° relative to the build platform to reduce stair-stepping on domed pump-volute surfaces, built at 0.05 mm layers, drained of uncured resin, washed in isopropanol inside an enclosed parts washer, and post-cured under UV until surface tack is eliminated. Supports are removed before the wax gate and runner assembly is attached with hot-melt adhesive; the cluster is dipped in colloidal silica slurry, stuccoed with fused silica, and subjected to a controlled dewax and burnout ramp. The shell must be heated through a foundry-specific burnout ramp, typically between 150 °C and 600 °C, to prevent pattern expansion from cracking the ceramic, with the final flash fire at the alloy-specific temperature. Terminal cast parts are usually aluminium and stainless-steel short-run prototypes such as A356-T6 intake manifold plenums, 304 stainless marine hardware bodies, and small impeller housings. This route is not recommended for alloys requiring shell preheats that exceed the thermal-decomposition stability of the photopolymer until a lot-specific ash trial has been completed.
Surface chemistry rather than bulk formulation is the primary process variable when Accura 40 master patterns are used to generate RTV silicone cavities for polyurethane vacuum casting. The photopolymer part is used at 100% solids as a dimensionally stable master; no additive is introduced into the resin before or after build, and the outer surface is not coated with a reactive release fluid that could alter pattern dimensions. For tin-condensation RTV systems, the master can be used after solvent washing and post-cure, but platinum-catalysed RTV systems frequently require a barrier sealer because unreacted acrylate species and residual photoinitiator can inhibit the platinum catalyst at the pattern surface. Conformance verification for the cured silicone mould is typically conducted under ASTM D412-16 for tensile properties, ASTM D624-00(2012) for tear strength, and ASTM D792-20 for density; master pattern dimensions are checked against ISO 1101:2017 for geometric tolerancing. The downstream sequence involves SLA build at 0.05 mm layers, support removal, wet sanding from 400 to 1,200 grit, sealing with an epoxy or polyurethane barrier coat at 10–25 µm dry film thickness, and then pouring RTV silicone under vacuum to avoid bubble entrapment. Terminal products from this tooling route are polyurethane vacuum-cast prototypes—such as automotive interior knobs, handheld device bumpers, and sealing grommet mock-ups—produced in 40–60 Shore A or 70–85 Shore A polyurethane systems depending on the target elastomer durometer. The operational boundary is that platinum-catalysed RTV with high tear strength is more sensitive to inhibition than tin-condensation RTV; if a sealer cannot be tolerated on high-gloss optical surfaces, a tin-catalysed system is selected instead.
Accura 40 is used for aerodynamic test articles where low surface roughness, machinability after build, and the ability to add pressure instrumentation matter more than thermal endurance. The material is verified against ASTM D638-14, ASTM D790-17, and ASTM D648-18 as a baseline for mechanical acceptance; model metrology is typically assessed under ISO 1101:2017 with coordinate measuring machine reports tied to the wind-tunnel test campaign’s datum system. The photopolymer is processed as a 100% single-component resin; no antistatic filler is added to the liquid feedstock because static dissipation is handled by an external conductive coating applied after machining. A wind tunnel model is usually built in sections at 0.05 mm layer thickness to preserve leading-edge radii, assembled with epoxy adhesive on internal spar structures, UV post-cured, rough-finished by wet sanding, and then hard-sanded with 400–1,000 grit abrasive paper. Pressure taps are drilled at 0.5–1.0 mm diameters and connected to internal stainless-steel or nylon tubing with cyanoacrylate or epoxy potting; the internal void is sealed to prevent leakage between adjacent taps. The model is then coated with an epoxy primer and block sanded to final aerodynamic smoothness. Terminal parts include half-span wing sections, external store models, inlet duct test articles, and pressure-tapped bodies used in subsonic wind tunnels at stagnation temperatures below the resin’s heat deflection threshold. The main operational boundary is that stagnation temperature and frictional heating must not drive the surface temperature above approximately 55 °C during a continuous run, because at 0.46 MPa the heat deflection temperature is 64 °C. Stress concentrations at pressure-tap holes can generate microcracks if drilling feeds are excessive, so carbide micro-drills and low feed force are specified.
| Standard designation | Property | Published datasheet value |
|---|---|---|
| ASTM D638-14 | Tensile strength | 61 MPa |
| ASTM D638-14 | Tensile modulus | 2,600 MPa |
| ASTM D638-14 | Elongation at break | 6% |
| ASTM D790-17 | Flexural strength | 94 MPa |
| ASTM D790-17 | Flexural modulus | 2,400 MPa |
| ASTM D648-18 | Heat deflection temperature at 0.46 MPa | 64 °C |
| ASTM D2240-15 | Hardness | 86 Shore D |
Where enclosure snap-fit prototypes require injection-moulding-like dimensional fidelity without production tooling, Accura 40 is evaluated against polycarbonate and polypropylene benchmark data but is constrained by the resin’s notch sensitivity and moisture absorption behaviour, which differ from production thermoplastics. Relevant compliance inputs are IEC 62368-1:2018 for enclosure mechanical robustness, ASTM D256-10 for notched Izod impact resistance, and ASTM D638-14 for tensile strain-at-break used in snap-fit beam calculations. The liquid feedstock is used as a 100% photopolymer resin with no flame-retardant additive, no impact modifier, and no colour dispersion at point of use; UL 94 classification is not published for this material, so final enclosure flammability must be tested on the assembled device. The typical process for a thin-wall enclosure begins with build orientation that places snap-beam layers along the beam length rather than across it, layer thickness of 0.05 mm, isopropanol cleaning, UV post-cure, support removal, and then a light vapour-smoothing or sanding operation to reach a finish suitable for painting. Thread inserts are installed with heat-stake equipment or press-fit brass inserts, with hole diameter adjusted 0.1–0.2 mm below the insert knurl diameter. Terminal products are non-thermal handheld electronic enclosures, ear-worn device housings, and charger-case prototypes. The material is not suitable for continuous structural loads above 55 °C or for drop tests that exceed the notched Izod value listed in the supplier datasheet.
Fluid-flow visualisation hardware made from Accura 40 is limited to low-pressure, low-temperature coolant circuits because the resin’s heat deflection temperature under 0.46 MPa is 64 °C per ASTM D648-18, and prolonged immersion in 50:50 ethylene glycol/water at elevated temperature can plasticise the polymer surface. The material is loaded into the vat at 100% solids with no thermal stabiliser or hydrolysis inhibitor; the absence of such additives means there is no datasheet-backed performance reserve beyond 55 °C continuous fluid exposure. For compatibility evaluation, ASTM D543-21 is applied for mass, volume, and hardness change after chemical immersion, and ASTM D638-14 is used for pre- and post-immersion tensile comparisons. The manufacturing sequence often starts with digital sectioning of the coolant gallery into printable segments to preserve internal channels; build layers at 0.05 mm or 0.1 mm are used depending on internal wall resolution, followed by solvent washing, compressed-air clearing of internal channels, and UV post-cure. Internal supports are removed by mechanical picks and flushed with isopropanol; translucent or transparent sections are produced by wet sanding to 1,200 grit and polishing to achieve visual clarity for particle tracing or dye-injection studies. Terminal products include coolant passage mock-ups for thermal-management design reviews, HVAC distribution housings for flow visualisation with smoke or dye, and water-pump inlet models used at ambient temperature. The operational boundary is explicit: pressurised coolant circuits above 0.1 MPa and temperatures above 55 °C should be converted to CNC-machined aluminium or epoxy tooling because creep and fluid absorption can distort mating flanges and cause leakage during test.
Non-sterile anatomical planning models printed from Accura 40 are used in hospital engineering and surgical-planning departments where the model is a shape reference rather than a patient-contacting device. The applicable quality framework is ISO 13485:2016 for the device manufacturer’s design controls when the model is part of a pre-surgical validation file, ISO 14971:2019 for risk management, and FDA 21 CFR 820.30 for design and development inputs; ISO 10993-1:2018 biocompatibility is not claimed because the printed part does not contact breached tissue or mucous membranes. The resin is processed as a 100% single-component photopolymer without radiopaque filler, sterilisation additive, or antimicrobial surface treatment; CT visibility of the model is therefore derived from the geometry of the target anatomy rather than from material attenuation. The workflow begins with segmentation of DICOM datasets, conversion to an STL with a target voxel threshold, build at 0.05 mm layers, washing, post-cure, and support removal; models are then verified with a caliper against key anatomical dimensions and optionally coated with a polyurethane sealer if repeated handling is expected. Terminal outputs are cardiac chamber models, mandibular and maxillary reference prints, and long-bone fracture planning models used by surgical teams as reference pieces before intraoperative imaging or navigation.
For low-stress coordinate measuring machine fixtures and robot end-of-arm fingers, Accura 40 is selected only where the fixture does not require production-level clamp loads or repeated thermal cycling. Dimensional acceptance is tied to ISO 1101:2017 for geometric tolerancing and ISO 10360-2:2009 for coordinate measuring machine verification when the fixture influences point-cloud alignment. The resin is used as a 100% photopolymer stock with no glass or carbon filler and no abrasive additive; stiffness is therefore lower than filled epoxy tooling, and load-bearing interfaces require metallic inserts. The manufacturing route involves build at 0.1 mm layers, post-cure, drilling and reaming dowel holes, and pressing in stainless-steel bushings or helicoils at locations that receive threaded fasteners. Terminal items include CMM fixture plates, optical alignment brackets, and robot gripper jaw sets used for short-run assembly or inspection tasks.
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3D Systems Accura 40 Plastic for SLA Systems is an acrylate-based photopolymer supplied in 10 kg and 20 kg containers and processed on 355 nm stereolithography platforms, including Viper Pro, iPro 8000, and ProX 800 systems. Typical mechanical properties reported by the supplier include tensile strength of 62–70 MPa, tensile modulus of 2.7–3.0 GPa, elongation at break of 6–8 %, flexural strength of 88–108 MPa, and notched Izod impact resistance of 16–22 J/m when tested according to ASTM D638-14, ASTM D790-17, and ASTM D256-10. The material is qualified for functional prototyping, master patterns for RTV or polyurethane cast tools, and limited-production inspection fixtures where the combination of dimensional repeatability and post-cure rigidity is more important than high-impact damping or elastomeric recovery. Accura 40 differs from Accura 25 in its higher flexural modulus, from Accura Xtreme in its lower notched impact ceiling, and from Accura 60 in its reduced optical clarity but higher practical toughness after post-cure. The green-state accuracy and post-cure hardness of Accura 40 are balanced by a heat deflection temperature below 60 °C under a 0.46 MPa load, which constrains continuous-service temperature in unsupported load-bearing applications.
Machining and finishing operations on Accura 40 are usually performed after a post-cure cycle, not in the green state. Green parts are washed in isopropanol or tripropylene glycol monomethyl ether, dried, and post-cured in UV chambers; residual monomers not fully converted before finishing can react exothermically during dry sanding at speeds above 15 m/s. Therefore, wet sanding with 400–800 grit on a rotary tool below 12 m/s is specified. After finishing, parts are sealed with a two-part epoxy or urethane coating to control moisture uptake. This production sequence is validated on standard SLA service lines and is referenced in user guides for Viper, iPro, and ProX platforms.
| Property | Test method | Typical range |
|---|---|---|
| Tensile strength | ASTM D638-14 | 62–70 MPa |
| Tensile modulus | ASTM D638-14 | 2.7–3.0 GPa |
| Elongation at break | ASTM D638-14 | 6–8 % |
| Flexural strength | ASTM D790-17 | 88–108 MPa |
| Flexural modulus | ASTM D790-17 | 2.5–2.8 GPa |
| Notched Izod impact | ASTM D256-10 | 16–22 J/m |
| Heat deflection temperature at 0.46 MPa | ASTM D648-16 | 52–58 °C |
| Shore D hardness | ASTM D2240-15 | 84–86 |
| Water absorption after 7 days | ASTM D570-98 | 0.32 % typical |
| Density | ASTM D792-20 | 1.12–1.14 g/cm³ |
On large-frame SLA systems with a 0.125 mm focused laser spot and 0.10 mm layer thickness, recoat velocity is a primary determinant of green-part z-axis accuracy. When recoat travel is set below 60 mm/s, the resin surface remains exposed to chamber oxygen and humidity for an extended period; oxygen inhibition lowers single-layer conversion by 3–5 % and can produce a soft interface that shifts measured layer thickness by 2–4 µm. When recoat travel exceeds 120 mm/s, air entrainment at the trailing edge of the blade can produce 50–150 µm voids in downfacing or trapped-volume features. Production batches typically use a recoat velocity of 90 mm/s and a resin temperature of 30 ± 2 °C; under these settings, layer-thickness repeatability across a 650 mm × 750 mm platform is held within ±0.025 mm. The recoat delay before laser exposure is maintained at 5 s or less, because longer delays permit photopolymerization inhibition to vary across the build envelope. These limits are platform-specific and should be re-established after resin refresh or recoater blade replacement.
Blade gap and resin level are also monitored. A blade gap below 0.10 mm can create shear thinning in the recoat layer and starve fine features, while a gap above 0.20 mm can leave excess resin that increases cure-through and raises side-wall growth by 10–20 µm. Resin level sensors are set to maintain a level within ±0.5 mm of the calibration plane. These tolerances are derived from field service observations on Viper Pro and iPro systems; published data for every platform configuration is limited.
Under aggressive solvent exposure, Accura 40 post-cured parts show a measurable but reversible response. Immersion in 90 % isopropanol for 24 h at 23 ± 2 °C produces a mass increase of 0.5–1.0 % and a surface hardness reduction of 2–4 Shore D points when measured according to ASTM D2240-15. Continuous contact with ester-based mold release agents can cause craze lines, particularly on thin walls below 1.0 mm, so Accura 40 tooling masters are sealed with a two-part epoxy or urethane coating before repeated use with solvent-based release compounds. For water-based service, dimensional verification is performed after preconditioning at 23 ± 2 °C and 50 ± 5 % relative humidity for 48 h; raw water absorption after 7 days immersion at 23 °C is typically 0.32 % by mass according to ASTM D570-98. This moisture uptake is largely reversible after drying at 40 °C for 24 h. Accura 40 is therefore less solvent-tolerant than Accura Xtreme in high-humidity or mold-release service but more dimensionally stable than Accura 25, which exhibits greater elastomeric recovery after solvent-induced swelling.
Green parts washed in isopropanol or TPM are post-cured in UV chambers with a total UVA dose between 30 J/cm² and 60 J/cm². At doses below 30 J/cm², residual acrylate unsaturation permits ambient moisture uptake to reach 0.4 % by mass and reduces tensile modulus by 5–8 % relative to fully cured parts. At doses above 60 J/cm², thermal over-aging in the chamber can embrittle thin sections; production batches have shown a drop in notched Izod values to 12–15 J/m while tensile strength remains within ±4 % of the datasheet midpoint. The supplier-reported heat deflection temperature for Accura 40 is 52–58 °C under 0.46 MPa according to ASTM D648-16, and this range applies only after complete post-cure. Shrinkage compensation factors of 0.4–0.7 % in x-y and 0.5–0.8 % in z are applied to master patterns before building; dimensions are rechecked after post-cure, because under-cured parts can drift by 0.1–0.2 mm over 24 h at room temperature. Post-cure chambers with irradiance above 10 mW/cm² in the UVA band may require reduced total dose to avoid surface microcracking in sections thicker than 6 mm. Published data for a specific post-cure chamber model is limited, so dose calibration is performed with vat-specific resin calibration build specimens.
Accura 40 is specified for rigid snap-fit prototypes only when the snap beam thickness is less than 3 mm and the deflection angle is limited to 1–2°. In insertion-cycle trials at 23 ± 2 °C and 30 ± 5 % relative humidity, a cantilever snap with a 2 mm beam survived 50,000 insertion cycles without visible cracking; the same geometry in Accura Xtreme exceeded 100,000 cycles but exhibited lower overall part stiffness. These figures are application-dependent and come from manufacturer application trials; published data for specific snap-fit geometries is limited. The comparison below summarizes the material-selection boundary.
| Property | Accura 40 | Accura 25 | Accura 55 | Accura Xtreme |
|---|---|---|---|---|
| Tensile strength, ASTM D638-14 (MPa) | 62–70 | 38–42 | 63–70 | 43–48 |
| Tensile modulus, ASTM D638-14 (GPa) | 2.7–3.0 | 1.4–1.7 | 3.0–3.4 | 1.7–2.0 |
| Elongation at break, ASTM D638-14 (%) | 6–8 | 15–25 | 7–10 | 13–18 |
| Notched Izod impact, ASTM D256-10 (J/m) | 16–22 | 25–32 | 28–38 | 60–80 |
| Heat deflection temperature at 0.46 MPa, ASTM D648-16 (°C) | 52–58 | 45–50 | 54–60 | 50–54 |
| Shore D hardness, ASTM D2240-15 | 84–86 | 80–82 | 86–88 | 80–82 |
The comparison indicates that Accura 40 occupies a middle stiffness and moderate impact range: it is stiffer than Accura 25 and Accura Xtreme while sacrificing notched impact energy relative to Accura Xtreme. In assemblies where dimensional repeatability under loading is critical, such as inspection fixtures and drill jigs, Accura 40 is chosen over Accura 25 because the latter exhibits greater viscoelastic recovery after machining and solvent exposure. In assemblies where repeated high-energy snap insertion is required, Accura Xtreme is chosen because its elongation and notched impact values are substantially higher, though its lower flexural modulus requires thicker wall sections to maintain the same deflection force.
A continuous flexural load at 50 °C for 500 h produces creep deflection before systematic failure. Accura 40 retains 85–92 % of its initial flexural modulus according to ASTM D790-17, while the creep modulus at 1 % strain falls to 1.8–2.1 GPa. This behavior differs from Accura 55, which has a higher initial flexural modulus and better retention under continuous load, and from Accura Xtreme, which has greater elongation capacity but lower modulus. Therefore, Accura 40 is used for assembly fixtures and inspection gauges exposed to temperatures below 55 °C; unsupported continuous load above the heat deflection temperature range of 52–58 °C is outside the material’s specified operational boundary. Stress relaxation is performed at 50 °C for 2 h before final inspection to remove residual green-state stresses produced during the SLA build. Published data for specific load-bearing geometries is limited, and each production fixture should be validated using a strain-gauge instrumented trial with the intended insert and clamping force.
