| HS Code | 403602 |
| Color | Peach |
| Density | 1.15 g/cm³ |
| Tensile Strength | 42 MPa |
| Tensile Modulus | 2,500 MPa |
| Elongation At Break | 2.5% |
| Flexural Strength | 64 MPa |
| Flexural Modulus | 2,400 MPa |
| Notched Izod Impact Strength | 18 J/m |
| Hardness | 82 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 |
| Viscosity | 1,100 cps at 30°C |
| Critical Exposure | 10.5 mJ/cm² |
| Penetration Depth | 0.15 mm |
As an accredited 3D Systems Accura e-Stone™ PEACH Plastic for SLA Systems factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in a 1 kg opaque plastic bottle clearly labeled for 3D Systems Accura e-Stone Peach Plastic SLA resin. |
| Container Loading (20′ FCL) | 20′ FCL loading: palletized 3D Systems Accura e-Stone™ PEACH SLA plastic, securely strapped, ambient, dry, protected from heat and moisture. |
| Shipping | Accura e-Stone™ Peach Plastic for SLA Systems ships as a liquid photopolymer resin in sealed, opaque, UN-rated containers. Transport per SDS and DOT/IATA/IMDG rules; protect from heat, light, and freezing. May require hazmat paperwork. Inspect for leaks upon arrival. Follow all local, national, and international regulations. |
| Storage | Store 3D Systems Accura e-Stone™ PEACH Plastic for SLA Systems in original, tightly closed containers, upright, in a cool, dry, well-ventilated area. Protect from direct sunlight, UV light, heat, sparks, flames, and moisture. Maintain recommended temperature, typically 15–30°C, and avoid freezing. Segregate from oxidizers and incompatible materials. Follow the SDS and local regulations. |
| Shelf Life | Shelf life is 12 months from date of manufacture if stored in original, unopened containers at 20–25°C, protected from light and moisture. |
Accura e-Stone PEACH is evaluated in downstream applications where the failure mode is not impact ductility but creep, dimensional drift, and surface replication. The material is an opaque peach-coloured mineral-filled stereolithography photopolymer formulated for 355 nm SLA systems including the 3D Systems ProX 800, iPro 8000, and Viper si2. Layer thickness is normally selected at 50 µm or 100 µm; 50 µm is mandatory when locator bores and fine recesses must retain a machined tolerance of ±0.05 mm to ±0.10 mm. The mineral filler increases flexural modulus above unfilled SLA resins when measured per ASTM D790-17, but it also requires controlled vat agitation because solids can settle during standby periods and alter recoating viscosity. The material is classified as a rigid polymer with low elongation at break, which makes thin sharp edges vulnerable to chipping during support removal and hand finishing. These characteristics bound the applications described below.
Room-temperature-vulcanizing silicone tooling master patterns consume a measurable share of Accura e-Stone PEACH output on production lines making short-series polyurethane cast parts. The SLA pattern is designed as an oversized master scaled by the recorded linear shrinkage factor of the specific RTV rubber, commonly between 0.3 % and 0.8 % for both addition-cure and condensation-cure systems. Pattern walls are modelled at 1.5 mm to 2.5 mm thickness to prevent flexure of unsupported vertical faces during silicone degassing. Release is carried out with a solvent-free silicone release agent; solvent-based releases can alter the exposed surface and shift dimensional control. A documented failure mode on production vacuum casting cells is cure inhibition at the silicone-resin interface. This occurs when residual acrylate monomer remains in partially post-cured Accura e-Stone PEACH patterns. The control sequence includes washing in isopropyl alcohol or tripropylene glycol monomethyl ether in closed-loop automated washers, UV post-cure in a 3D Systems ProCure 750 or equivalent flood-curing system, and a 48-hour ambient rest at 23 ± 2 °C and 50 ± 5 % relative humidity before silicone pouring. Published data for this specific configuration is limited; therefore, production cells qualify each lot by casting a silicone pad against a witness coupon and measuring Shore A hardness after 24 hours. When inhibition is present, the silicone remains tacky at the interface and Shore A hardness drops by more than 5 points compared with the control pad. Large pattern faces are sanded with 600-grit wet dry abrasive before molding; this removes the last visible layer termination and lowers Ra to below 1.0 µm on benchtop profilometry. Operators report that skipping the rest period leads to uncontrolled bubble formation at the pattern-silicone interface during vacuum de-airing of the rubber, especially on vertical sidewalls.
Wind tunnel test articles for prototype automotive and UAV development require high flexural modulus, low creep under aerodynamic load, and acceptable surface finish after hand finishing. Accura e-Stone PEACH is processed at 50 µm layers when leading edge radii approach 0.5 mm. The slicing orientation is indexed so that the layer boundary does not run parallel to the stagnation line. This reduces boundary layer tripping at exposed layer edges. Because the formulation has low elongation at break, the trailing edge is thickened to 0.8 mm minimum, and the build is supported along the entire chordwise extent to avoid curl. After post-cure, the surface is primed with a two-component polyurethane filler and wet-sanded to remove the peak-to-valley layer topography. Dimensional checks are made with a coordinate measuring machine across the pressure and suction surfaces; spanwise twist is held within ±0.15 % of chord, and the leading edge profile tolerance is ±0.10 mm for a 200 mm chord. Airflow operators have observed that unfilled SLA resins show measurable sag in thin wings after 24 hours of repeat tunnel runs, while the mineral filler in Accura e-Stone PEACH reduces creep under similar static loading. The governing test method for flexural modulus is ASTM D790-17; for tensile properties ASTM D638-14 is used by test laboratories. The material is not qualified for transonic wind tunnel models with sustained aerodynamic heating above 65 °C, because the heat deflection temperature under 1.82 MPa according to ASTM D648-18 is not sufficient for those regimes. Published data for this specific configuration is limited, so each wind tunnel model lot is verified with a sacrificial build coupon exposed to the same UV and thermal history.
The failure appears as radial microcracking at the base of the tool after 20 to 50 thermoforming cycles. The cause is not thermal shock alone but a combination of low elongation, residual stress from the SLA build, and peel force transfer from the hot polymer sheet. Accura e-Stone PEACH tools are used for low-temperature vacuum forming of polystyrene, polyethylene terephthalate glycol, and thin-gauge polypropylene. The tool is built as a shell with 4 mm to 6 mm wall thickness and filled with an epoxy backfill to limit bending during forming. The backfill is an unfilled two-component polyurethane or epoxy castable with an exotherm below 60 °C. A release film or mould release agent is specified at the tool surface, because direct contact between hot sheet and bare Accura e-Stone PEACH increases peel force and pulls small chips from the tool corner. Minimum draft angle is set at 2 degrees for tool depths below 50 mm and 3 degrees for deeper geometries. Post-cure stress relief is performed by heating the finished tool to 55 °C for 2 hours before first use; this step lowers residual stress at the layer interfaces and reduces the incidence of microcracking at sharp internal corners. Edge radii are maintained at 0.5 mm or larger. The failure mode is recorded on production thermoforming lines and confirmed by cross-sectional microscopy showing crack initiation at layer boundary intersections less than 0.2 mm below the surface where localised stress from the release film was highest.
In short-run vehicle launch programmes, Accura e-Stone PEACH is substituted for CNC-machined aluminium in assembly checking fixtures that do not require long-term wear resistance. The material is selected because its mineral filler gives a lower coefficient of thermal expansion than unfilled stereolithography resins, reducing dimensional drift when the fixture is moved between a 20 °C metrology room and a 28 °C assembly hall. Nominal build thickness is 50 µm on an iPro 8000 or ProX 800; datum pads and locator holes are machined after SLA build using carbide tooling at low spindle speed to prevent chipping. Inspection fixture frames are constructed from aluminium extrusion, with the Accura e-Stone PEACH contact surfaces bonded into pockets using a two-part methacrylate adhesive. Gauging points are qualified on a coordinate measuring machine after 72 hours of ambient conditioning. Each point is measured twice at 23 ± 1 °C; the average deviation must remain within ±0.10 mm. When the fixture is used on a production line with 300 assembly checks per day, the contact points show early edge rounding after approximately 2,000 insertion cycles on chrome-plated counterpart features. This wear is not a bulk material failure but is a surface abrasion limit; fixture maintenance therefore includes periodic re-machining of the contact pads. Operators note that residual uncured material in deep-pocket locator holes can be removed with a two-step solvent wash, but that harsh ultrasonic cleaning in isopropanol for more than 10 minutes may increase the size of machined bores by 0.02 mm to 0.05 mm due to softening of the surface. This inspection gauge application is governed by internal dimensional quality standards and, where required, compliance to ISO 9001:2015; the resin itself is not classified as a measuring instrument under ISO 10360-2.
| Downstream segment | Primary failure mode | Operational control | Standard/method |
|---|---|---|---|
| RTV silicone master pattern | Surface cure inhibition from residual monomer | Shore A delta ≤ 5 after 24 h; rest at 23 ± 2 °C for 48 h | ASTM D2240-15 |
| Wind tunnel model | Layer boundary tripping and trailing edge chipping | 50 µm layer; trailing edge thickness ≥ 0.8 mm; CMM tolerance ±0.10 mm | ASTM D790-17, ASTM D638-14 |
| Vacuum forming tool | Draft corner microcracking | Draft ≥ 2 degrees; stress relief at 55 °C for 2 h; edge radius ≥ 0.5 mm | ASTM D648-18 |
| Assembly inspection fixture | Wear-induced edge rounding | Post-machining; requalify after 2,000 cycles; ambient 23 ± 1 °C | ISO 9001:2015, ISO 10360-2 |
| LP-RIM prototype tool | Parting line fragmentation | Cavity pressure ≤ 0.5 MPa; tool temperature ≤ 60 °C; release agent each shot | Internal CMM control plan |
Automotive styling studios use Accura e-Stone PEACH as a stable visual evaluation model when clay surfaces must be verified for highlight projection and surface continuity. The material’s opaque peach colour simulates the neutral primer tone used in design review rooms without the need for immediate top-coating, but indoor lighting and temperature are controlled. The model is assembled from multiple SLA blocks bonded with cyanoacrylate or two-part epoxy paste; the bonded regions are filled and sanded to create a continuous surface. After sanding from 400 to 1,200 grit, the surface is sealed with a polyester spray filler and top-coated with a matte clearcoat. This approach allows the evaluation of highlight lines under overhead lighting in a design review studio. The models are not suitable for outdoor weathering or prolonged UV exposure because photopolymer colour may drift; indoor use at 20–25 °C and controlled humidity is specified. Published data for this specific application is limited, and studios deploy physical benchmark panels to judge colour consistency across SLA builds. Surface continuity is checked with a 1 m straight edge and a 0.5 mm coloured contour template; deviating areas are corrected before design approval.
Low-pressure reaction injection molding tooling made from Accura e-Stone PEACH has been validated for unfilled polyurethane systems dispensed at internal cavity pressures below 0.5 MPa. The tool cavity is built as a shell and backfilled with aluminium-filled epoxy to carry clamping force from a laboratory press. Because the photopolymer has low elongation at break, narrow ribs and blade seals are built with a minimum root radius of 0.8 mm. A release agent is applied before each shot; without release, flash adhesion at the parting line can pull away surface fragments during demoulding. The tool is preheated to 40 °C and not allowed to exceed 60 °C during exothermic polyurethane cure. Thermal cycling above this range accelerates layer delamination at the cavity corners. Shot counts are typically limited to 20–50 parts, after which the cavity is re-machined and resealed. The process is used only for prototype seals and grommets, not for serial production. Dimensional qualification follows an internal control plan with coordinate measuring machine inspection of castings at defined datums; no ISO plastic molding standard applies to the tool material boundary.
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3D Systems Accura e-Stone™ PEACH Plastic for SLA Systems is a filled, peach-pigmented stereolithography photopolymer formulated for laser-cure additive manufacturing on 3D Systems SLA platforms operating at 355 nm. The resin is not an unfilled acrylate or an epoxy-only system; its dispersed mineral phase raises post-cure modulus and reduces creep relative to unfilled resins in the Accura product line. Typical build configurations reported for this resin include 0.100 mm and 0.125 mm layer thickness settings on ProX 800-class systems, although the actual z-resolution is governed by machine-specific recoating parameters and the operator’s validated process window. The peach pigmentation serves as a grade identifier and visual contrast aid during finishing. Mechanical characterization is referenced to ASTM D638-14 and ASTM D790-17; single-point datasheet values are not reproduced here because post-cure dose, part orientation, and wall thickness produce property scatter that cannot be reduced to one fixed nominal value without losing production context.
Thin-walled casting patterns produced from Accura e-Stone PEACH are sensitive to the secondary UV post-cure dose. Under-cured sections retain unreacted monomer that can continue to polymerize during storage, producing slow linear shrinkage and out-of-plane warpage. Over-curing generates excessive crosslink density and residual surface stress, which manifests as concave distortion on walls below 1.0 mm thickness. The process window is established by measuring green-state and post-cured dimensions on a machined reference coupon rather than by relying on visual surface finish. Heat deflection temperature is evaluated under ASTM D648-18 at both 0.46 MPa and 1.82 MPa flexural stress; the lower-stress condition is more relevant to shell de-waxing and low-pressure tooling heat exposure. Flexural modulus is evaluated under ASTM D790-17 or ISO 178, and tensile testing under ASTM D638-14 or ISO 527-2. When a pattern includes unsupported spans, the effective stiffness after post-cure determines whether the pattern survives shell building without breakage.
The resin’s mixed filler system affects recoat behavior differently from unfilled Accura grades. On high-speed recoat platforms, prolonged idle periods permit filler migration toward the vat bottom. Agitation is required before initiating a build after downtime exceeding 8 h. Viscosity stratification can produce a low-modulus upper layer that under-cures at the same laser exposure, followed by a high-solids lower layer that increases blade resistance. Operators using ProX 800 systems with wiper-based recoating report that changes in recoat force trace are an early indicator of filler settling. The recoat speed and blade gap are locked to the validated process rather than adjusted for apparent surface gloss. Batch-to-batch variation in filler particle size can shift the liquid resin’s viscosity and the cured material’s impact sensitivity; an incoming viscosity check under ISO 2884 is a practical release test.
Accura e-Stone PEACH is not a direct substitute for Accura CastPro in every investment casting workflow. CastPro is formulated for low residual ash after shell burnout and has published burnout profiles developed for dental and industrial casting shells. Accura e-Stone PEACH is positioned for pattern stock that requires higher green-state rigidity and better handling damage resistance during shell face-coat application. The mineral filler that contributes stiffness can leave a higher incineration residue than unfilled casting-specific resins. For shell systems operating below 700 °C burnout, published data for this specific configuration is limited, and a production-scale burnout trial should be performed before changing pattern material. Where the pattern is used only for room-temperature vulcanizing silicone tooling, low-ash performance is not the controlling selection criterion. Differences from Accura 25 are also significant: Accura 25 is an unfilled, polypropylene-like SLA material with higher elongation and lower stiffness, while Accura e-Stone PEACH exhibits higher rigidity and is less appropriate for snap-fit or high-strain applications.
Surface finishing operations on Accura e-Stone PEACH require coolant or low-pressure dry cutting because the filled polymer behaves as a brittle solid under high-speed steel tooling. Rotary tools with carbide burrs and high spindle speeds generate local heat that can cause surface chalking and microcracking. Wet sanding with 600-grit followed by 1000-grit paper is used to remove build layers without excessive material removal. Grit blasting with glass bead at 0.2–0.4 MPa is an alternative for matte texture, but sharp-edge erosion is a measured risk on thin walls. Pattern sealing is required before silicone molding because the cured surface contains residual uncured monomer and open pores along layer boundaries. A two-part polyurethane or epoxy sealer with no amine catalyst is applied after cleaning. Amine-based mold rubbers and epoxy hardeners can attack the pattern surface and should be avoided unless compatibility testing shows no softening after 24 h contact.
Accura e-Stone PEACH is conditioned at 23 ± 2 °C and 50 ± 10% relative humidity in accordance with ISO 291 before dimensional verification. Water absorption is evaluated by ASTM D570-98(2021), and absorbed moisture can expand the filled polymer matrix enough to affect tight tooling fits. Storage above 60% RH for extended durations may increase surface tack and reduce the effective hardness; desiccant drying at 30 °C for 24–48 h restores measurable hardness in most production cases, but the dimensional change is not always fully reversible. Pattern designers incorporate a volumetric compensation factor derived from measured linear shrinkage on the machine, oven, and post-cure cycle. This value is not a fixed material property; it varies with part size, wall thickness, and build orientation. Layer-adhesion anisotropy also produces lower tensile strength in the Z-direction than in the X-Y plane, which is considered when the pattern is loaded perpendicular to build layers.
| Performance attribute | Test standard | Control relevance |
|---|---|---|
| Tensile strength and modulus | ASTM D638-14, ISO 527-2 | Pattern ejection and handling loads |
| Flexural stress and modulus | ASTM D790-17, ISO 178 | Shell-building and extraction loads |
| Heat deflection temperature | ASTM D648-18 | Short-term tooling and de-waxing exposure |
| Water absorption | ASTM D570-98(2021) | Storage-induced dimensional drift |
| Liquid resin viscosity | ISO 2884 | Recoat consistency and filler dispersion |
The resin’s operational boundaries include a narrow usable temperature window during cleaning. Solvent immersion in isopropanol above 25 °C can cause swelling and edge softening, especially on thin sections. Tripropylene glycol monomethyl ether is the preferred cleaning solvent for filled SLA grades because its lower evaporation rate and solvency reduce surface stress cracking. After cleaning, forced-air drying is mandatory before UV post-cure; residual solvent in the polymer network can cause micro-voids. The post-cure chamber provides uniform UVA exposure; a non-uniform chamber yields variable crosslink density and scatter in mechanical test results exceeding 10% coefficient of variation across the build platform. For full compliance documentation, users reference the 3D Systems material data sheet for Accura e-Stone PEACH and the equipment installation qualification records for the specific SLA system. When used in investment casting, the pattern is evaluated for shell cracking due to thermal expansion mismatch; published data for this specific configuration is limited for shell systems at high heating rates.
For master patterns used in room-temperature vulcanizing silicone tooling, Accura e-Stone PEACH combines high rigidity with low creep under vacuum pressure. The pattern surface is sealed after finishing because the layer interface can absorb silicone oil and plasticizer. A thin solvent-borne epoxy or two-part polyurethane sealer is applied in 2 coats by spraying, with flash-off at 20 °C. If the sealer contains volatile organic compounds, full outgassing before mold pouring is required to avoid bubble formation at the pattern surface. The silicone mold material is addition-cure platinum-catalyzed type; tin-catalyzed condensation-cure systems may release alcohol byproducts that interact with the sealer. A release agent based on a non-amine polymer film is applied at 0.2 μm dry thickness. In production-scale vacuum casting, the pattern is checked for dimensional movement after each molding cycle because repeated vacuum pulls can induce small creep deformation in thin walls below 2.0 mm.
On a 3D Systems ProX 800 with a frequency-tripled solid-state laser operating near 355 nm, the exposure strategy for Accura e-Stone PEACH is adjusted using critical exposure and cure depth data obtained from the resin’s working curve. The operator does not reuse the exposure settings from Accura 25 or Accura ClearVue because the filled resin’s higher viscosity and optical scattering shift the cure depth at equivalent laser dose. Beam compensation and alternate hatch spacing are determined from a pixel-based calibration grid built at the intended layer thickness. The build platform temperature is maintained within the machine manufacturer’s specified band, typically 28–32 °C, during printing; temperatures outside this band affect viscosity and recoat quality. Once the laser power is verified with a power meter traceable to the machine manufacturer, the energy is normalized to the build area and the scanning speed is set to produce the required dose per layer. Records of laser power, recoat force, and room humidity are retained as part of the machine qualification for each material lot.
| Selection attribute | Accura e-Stone PEACH | Accura CastPro | Accura 25 |
|---|---|---|---|
| Filler system | Mineral-filled, rigid | Casting-pattern formulated, low residue | Unfilled, polypropylene-like |
| Primary pattern function | High-stiffness masters and tooling | Investment casting burnout | Durable functional prototypes |
| Incineration residue | Higher than CastPro; validate for shell burnout | Low-ash profile | Not intended for shell burnout |
| Elongation behavior | Lower elongation, brittle under high strain | Controlled green-state behavior | Higher elongation, snap-fit use |
Accura e-Stone PEACH is stored in sealed, moisture-tight containers to prevent humid air from degrading the unreacted resin. Storage temperatures below 4 °C extend liquid resin shelf life, but the material is conditioned to 20–25 °C before loading into the SLA vat. Frozen or cold resin should not be introduced directly to a heated vat because thermal shock can induce temporary viscosity stratification and recoat defects. The resin is not compatible with solvent-based cleaning agents containing chlorinated hydrocarbons or strong alkalines; these agents can attack the cured surface and alter the peach-colored outer layer. When changing from another Accura resin in a shared vat, a full vat drain and clean is performed because cross-contamination between filled and unfilled formulations can shift both viscosity and photopolymerization behavior. Disposal of uncured resin, cleaning solvents, and post-cure wash solutions follows the supplier’s safety data sheet and local regulatory requirements under REACH and RoHS where applicable. The material has no documented food-contact approval under FDA 21 CFR 177.1550, and it is not specified for medical implant or long-term skin-contact devices without additional biocompatibility testing.
