| HS Code | 923010 |
| Material Type | Stereolithography (SLA) resin |
| Color | Opaque white |
| Density | 1.13 g/cm³ at 25°C |
| Viscosity | 260 cps at 30°C |
| Critical Exposure | 9.5 mJ/cm² |
| Penetration Depth | 0.15 mm |
| Tensile Strength | 55 MPa |
| Tensile Modulus | 2550 MPa |
| Elongation At Break | 7% |
| Flexural Strength | 95 MPa |
| Flexural Modulus | 2400 MPa |
| Notched Izod Impact | 25 J/m |
| Hardness | 80 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 Strength | 15 kV/mm |
| Volume Resistivity | 1.0 x 10^14 ohm-cm |
As an accredited 3D Systems Accura 55 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 sealed, opaque 1 kg plastic bottle with hazard labeling for 3D Systems Accura 55 Plastic for SLA Systems. |
| Container Loading (20′ FCL) | 20′ FCL loaded with 3D Systems Accura 55 Plastic for SLA Systems, palletized, labeled, and secured for ocean transport. |
| Shipping | Ship 3D Systems Accura 55 as UN3082, Environmentally Hazardous Substance, Liquid, N.O.S. (acrylate monomers), Class 9, Packing Group III. Use UN-approved, leakproof packaging, keep upright, protect from heat/light, include SDS, and follow DOT/IATA/IMDG rules; marine pollutant if applicable. |
| Storage | Store Accura 55 in a tightly closed original container in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, sparks, open flames, and incompatible materials such as oxidizing agents, amines, and polymerization initiators. Maintain 15–25°C (59–77°F) and protect from freezing. Use designated storage with adequate ventilation; keep out of reach of children. Follow local regulations and manufacturer instructions. |
| Shelf Life | 12 months when stored unopened in the original container in a cool, dry, well-ventilated area away from sunlight and heat. |
When a room-temperature vulcanizing tooling programme transfers an Accura 55 master into a filled polyurethane cavity, the controlling process variable is interfacial cure state rather than bulk hardness. The SLA pattern is built at 0.100 mm layer thickness on a 355 nm solid-state laser platform, cleaned in two successive 3 min baths of tripropylene glycol monomethyl ether or 99% isopropanol, then UV post-cured until Shore D readings stabilize per ASTM D2240-15e1. Dimensional stabilisation is performed at 23±2 °C and 50±5 % relative humidity for 24 h according to ISO 291:2008 before inspection against ISO 2768-1:1989 medium general tolerances. A tin-condensation RTV silicone with a catalyst-to-base ratio of 100:5 by mass is preferred because residual photoinitiator or phosphate-based release compounds on the pattern can inhibit platinum-catalysed addition-cure silicones at the interface. The mixed silicone is vacuum degassed at 8–10 mbar until visible gas evolution ceases, then poured to create a cavity wall thickness of 8–12 mm with Shore A 45–55 per ASTM D2240. Where platinum-cured silicone is mandatory for tear-strength reasons, a solvent-borne acrylic barrier coat at 20–25 µm dry film thickness is sprayed onto the pattern and allowed to dry for 2 h before tooling. The terminal polyurethane casting is vacuum cast at 40 °C mold temperature using a polyol-to-isocyanate A:B ratio of 100:55 by mass, demolded after 60 min, and post-cured at 80 °C for 4 h. Production batches of 25–50 cast parts are typical before cavity flash or Shore hardness drift requires tooling refresh. Published data for this specific Accura 55-to-platinum-silicone inhibition mechanism are limited; therefore the barrier coat protocol is validated on a boundary specimen before committing steel-reinforced master geometry.
| Validation step | Method | Condition | Acceptance boundary |
|---|---|---|---|
| Conditioning | ISO 291:2008 | 24 h at 23±2 °C, 50±5 % RH | No surface tack; mass drift below 0.1 % |
| Hardness | ASTM D2240-15e1 | Shore D on 6 mm panel | 80–85 Shore D; no point below 78 |
| Silicone compatibility | Visual + Shore A after 24 h cure | Tin-cure RTV 100:5; Shore A 45–55 | No interfacial exudate, inhibition layer, or cure delamination |
| Barrier coat adhesion | ISO 2409:2013 | Cross-cut, 2 mm spacing | Class 0–1 |
| Dimensional stability | ISO 2768-1:1989 medium | 100 mm reference length | ±0.2 mm across pattern |
Accura 55 is not a dedicated QuickCast or lost-wax pattern resin in 3D Systems’ published bulletins; however, evaluation of solid patterns for low-ash aluminium or steel investment casting requires thermogravimetric analysis under ISO 11358-1:2022 and residual ash measurement under ISO 3451-1:2019. The decomposition pathway of the acrylic-epoxy photopolymer network differs from unfilled wax or styrene-based casting materials. For shell systems using 30 % colloidal silica binder and zircon/aluminosilicate slurries with a Zahn #4 cup viscosity of 22–28 s, green shell must retain sufficient tensile strength during flash dewaxing; a solid Accura 55 pattern can expand sufficiently during autoclave dewaxing at 150 °C and 4 bar that shell thickness below 6 mm frequently cracks along the leading edge of the gating. Hollow patterns with internal lattice reduce thermal mass but require a minimum wall thickness of 2.0 mm to avoid loss of sealing integrity during slurry dip. Burnout profiles that ramp at 2 °C/min from 150 °C to 900 °C with a hold at 900 °C for 4 h have been used to clear conventional unfilled epoxies, but the residual ash content of Accura 55 should not be assumed to fall below the 0.05 % threshold often specified for aerospace nickel-base alloy castings without TGA confirmation. Published data for this specific configuration are limited. The terminal product is a one-piece disposable investment pattern for low-pressure aluminium intake plenums, compressor shrouds, or small valve bodies where post-cast HIP is not required and internal surface finish can tolerate Ra 6.3 µm per ISO 21920-2:2022.
Electronic enclosures fabricated from Accura 55 are evaluated against ASTM D638-14 Type IV tensile values with supplier-published tensile strength near 55 MPa, tensile modulus near 2,760 MPa, and elongation at break of approximately 5 %. These values place the material in a semi-ductile regime that supports snap-fit beam designs only if the root radius is maintained at 0.6–1.0 mm and the beam thickness-to-undercut height ratio is 3:1 or lower. Cyclic assembly testing on representative bosses is conducted on an Instron 5944 universal tester with a crosshead speed of 10 mm/min for 25 insertion-removal cycles; acceptable prototypes show no visible crazing beyond 0.5 mm from the root fillet. The enclosure shells are built at 0.100 mm layer thickness, cleaned in two 3 min baths of 99 % isopropanol, and UV post-cured; final flammability is not assumed from the raw resin and must be tested per IEC 60695-11-10:2013 or UL 94 HB on the actual wall thickness of 1.5–2.0 mm. Where electrostatic discharge protection is required, the surface is coated with a nickel-copper conductive lacquer at 25–35 µm dry film thickness and surface resistivity is verified per IEC 61340-2-3:2016 at 12 % relative humidity and 23 °C. The terminal product is a short-run functional enclosure for handheld diagnostic readers or battery-operated communication modules with living hinges eliminated and snap features designed for field-return reassembly rather than indefinite service.
Cabin air-vent clip prototypes produced from Accura 55 are generally constrained to ambient interior temperatures because the heat deflection temperature under 0.46 MPa load is reported near 50–55 °C per ASTM D648-18; designs requiring snap insertion into polypropylene ducts must use a clip beam thickness-to-undercut ratio of 1.5:1 or greater to reduce set after one insertion. UV exposure from side glazing accelerates surface yellowing and increases notch sensitivity; black polyurethane clear coats at 30–40 µm dry film thickness are used on prototypes tested under SAE J2412:2004, but long-term outdoor weathering data specific to Accura 55 are not published. The terminal product for this segment is a low-volume interior trim clip and cable routing bracket that verifies retention force, not a production part.
External housings for non-implantable medical devices are printed with 0.050 mm layer thickness to capture snap-fit details and engraved symbols; no ISO 10993 biocompatibility certification is automatically inherited from the uncured resin, so end-use claims under ISO 10993-5:2009 and ISO 10993-10:2021 must be generated by the device manufacturer on the finished sterilized part. The post-cured parts are washed in 70 % isopropanol / 30 % deionized water for 2 min contact time, then dried under forced air at 40 °C for 30 min; repeated liquid disinfection cycles above 10 cycles are not recommended because moisture uptake measured by ASTM D570-22 can reduce tensile strength by more than 5 % in epoxy-acrylate networks. Dimensional stability is checked at 50 % RH and 23 °C before caliper verification; ethylene oxide sterilization at 55 °C is possible only if the load meets the facility’s residual gas limits and the part wall thickness is below 3 mm, while steam autoclave exposure at 121 °C exceeds the material’s heat deflection capability and is contraindicated. The terminal product is a surgical planning model or an external device shell for benchtop verification, not a long-term skin-contacting component; no published data support repeated sterilization beyond 5 EtO cycles.
Assembly fixtures and CMM holding nests machined from Accura 55 are limited by viscoelastic creep in threaded inserts. Heat-set brass inserts with an outer diameter of 4.0 mm are installed at 140 °C with a constant-force press at 0.5 kN into bosses having wall thickness of 4.0–5.0 mm; the engagement depth to thread diameter ratio is maintained at 1.5:1 to 2.0:1 to avoid axial pull-out before 100 fastening cycles. Pull-out testing is performed on an Instron 5944 at 1 mm/min crosshead speed; the test records load at first thread stripping or boss radial cracking, and a minimum survival threshold of 180 N is applied for assembly pallet service, although published data for this precise insert-resin combination are limited. Ultrasonic insertion is contraindicated because localized heating above the resin’s glass transition has been observed to cause microcracking around the knurl in similar brittle photopolymers; specific published data for Accura 55 are limited. The fixture is built at 0.100 mm layer thickness, hand-finished only on non-functional surfaces, and subjected to 24 h creep stabilisation at 23 °C before final calibration. The terminal product is a dedicated assembly pallet or CMM locating fixture that holds aluminium or PEEK workpieces within ±0.1 mm of nominal contact points for short to medium production runs.
Competitive 3D Systems Accura 55 Plastic for SLA Systems prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
In stereolithography service bureaus producing dimensionally stable master patterns, the product 3D Systems Accura 55 Plastic for SLA Systems is specified when the cured material must approximate unfilled ABS in modulus, surface hardness, and finishing behavior while retaining the build resolution of 355 nm vat photopolymerization. The liquid photopolymer is an opaque white resin for layer-wise fabrication on SLA platforms; UV post-cure is required to reach published mechanical values. Accura 55 is used for vacuum-casting master patterns, dimensional check fixtures, snap-fit prototypes, and unpainted visual models where an opaque baseline aids optical inspection and surface defect identification. The material is not supplied as a ready-to-mold thermoplastic; it is a photoreactive thermoset resin whose final properties depend on build orientation, post-cure dose, and conditioning environment.
The resin requires a heated vat. Supplier processing guidance places the build temperature at 30–32 °C, where viscosity is approximately 180–200 mPa·s. At lower temperatures, leveling between layers is incomplete, producing heavy layering and bubble entrapment around up-facing surfaces; above 35 °C, dark-polymerization risk in the vat increases and bath lifetime may shorten. On systems with a recoater blade, the blade gap is typically set at 0.1–0.2 mm above the previous layer to permit clean material reflow without disturbing partially cured surfaces. Layer thickness is selected as 0.1 mm for master patterns requiring moderate Z resolution, or 0.05 mm for small features and thin walls below 1 mm. The working curve of the resin must be established for each machine because beam spot diameter and energy density vary between platforms; supplier literature does not provide a universal exposure value for all SLA systems. Batch-to-batch variance in photoinitiator activity and viscosity can shift recoater behavior and cure depth, so incoming resin should be conditioned at 20–25 °C before transfer to the vat. Operators monitor edge curl on long unsupported spans because differential shrinkage between exposed and unexposed regions can lift corners by 0.2–0.5 mm over a 150 mm span if support density is insufficient. Accura 55 is unfilled and exhibits lower shear-rate dependence than filled composite SLA resins such as Accura Bluestone, but insufficient leveling time still produces visible trap lines on broad flat surfaces.
Datasheet values for cured Accura 55 are reported after UV post-cure and conditioning at 23 ± 2 °C and 50 ± 10% RH. The values below are representative from supplier technical literature; conformance testing should be performed on specimens built in the same orientation and with the same post-cure equipment as production parts.
| Property | Test Method | Value | Unit |
|---|---|---|---|
| Tensile strength | ASTM D638-14 | 52 | MPa |
| Tensile modulus | ASTM D638-14 | 2,700 | MPa |
| Elongation at break | ASTM D638-14 | 7 | % |
| Flexural strength | ASTM D790-17 | 76 | MPa |
| Flexural modulus | ASTM D790-17 | 2,300 | MPa |
| Notched Izod impact | ASTM D256-10(2018) | 20 | J/m |
| Heat deflection temperature at 0.46 MPa | ASTM D648-18 | 55 | °C |
| Heat deflection temperature at 1.82 MPa | ASTM D648-18 | 49 | °C |
| Hardness | ASTM D2240-15 | 85 | Shore D |
| Density, cured | ASTM D792-20 | 1.13 | g/cm³ |
Tensile properties are obtained with ASTM D638-14 Type I specimens; flexural properties use ASTM D790-17 Method I. The mechanical values place Accura 55 closer to unfilled ABS than to polypropylene or polycarbonate. The elongation at break of 7% is the primary design limit for snap-fit closures. A cantilever beam calculation using an allowable strain factor of 0.7 × 7% yields a maximum outer fiber strain of 4.9%; features demanding higher deflection should be evaluated in Accura Xtreme or Accura 25, which exhibit higher elongation at break. Because heat deflection temperature at 0.46 MPa is 55 °C, support removal with heated tools or warm water must not exceed 45 °C if critical dimensions are to be retained.
In vacuum-casting master pattern production, an Accura 55 master is finished to a surface roughness below 0.8 µm Ra by sanding and priming before silicone tooling is poured. The RTV silicone molding process typically cures at 40–60 °C for 4–8 h; an Accura 55 master can withstand this thermal exposure when the part is fully supported and not under clamping load. Published moisture absorption data for Accura 55 under this specific workflow is limited; pattern makers condition masters at 23 ± 2 °C and 50 ± 10% RH before dimensional inspection to avoid humidity-induced drift. Direct investment casting patterns are not recommended unless low-ash burnout has been validated, because Accura 55 is more frequently used for the fabrication of tooling masters than for sacrificial foundry patterns. The 85 Shore D hardness permits hand sanding and primer application without surface tearing, but aggressive machining can generate frictional heat above the thermal operating range.
When an engineering team replaces CNC-machined ABS fixtures with Accura 55 SLA parts, the primary benefit is direct fabrication of contoured clamping surfaces without tooling. However, designed clearances must compensate for stair-stepping and post-cure shrinkage. Typical part accuracy on production SLA systems is ±0.1 mm for features under 100 mm, with larger parts requiring ±0.2 mm or more depending on geometry. Accura 55’s tensile modulus of 2,700 MPa is comparable to unfilled ABS at 23 °C; however, the notched Izod impact value of 20 J/m is lower than many injection-molded ABS grades. Load-bearing bosses should be designed with metal thread inserts or through-holes rather than thread-cutting screws because the elongation at break of 7% can produce radial cracking around pilot holes. In fixture use, published compressive yield data for Accura 55 is limited; if clamping stress is expected to exceed 30 MPa, end-user testing under ASTM D695-15 is required before production release.
Green parts removed from the build platform retain uncured resin. Washing in isopropyl alcohol or tripropylene glycol monomethyl ether for 2–3 min in an ultrasonic bath removes liquid resin; extended exposure beyond 10 min can cause surface crazing and dimensional drift. After washing, parts are dried with compressed air at pressure below 30 psi and then post-cured in a UV flood system with output between 365 nm and 405 nm. A typical post-cure dose is 30–60 min per side for wall thicknesses up to 3 mm. Post-cure increases tensile strength and heat deflection temperature, but also shifts the material from a translucent green state to an opaque white surface. Internal channels that cannot be reached by the UV flood remain undercured and may exude resin; such channels should be flushed and exposed through access ports or omitted from load paths.
The heat deflection temperature of 55 °C at 0.46 MPa and 49 °C at 1.82 MPa defines a narrow thermal operating window. Under continuous load, creep deformation initiates below heat deflection temperature; structural parts should not operate above 45 °C. Short-term excursions, such as paint bake cycles at 60 °C for 30 min, can be tolerated only if parts are fully supported and unloaded. Exposure to steam autoclave temperatures above 121 °C is outside the material’s thermal capability. Chemical exposure to ketones, chlorinated solvents, and strong alkaline cleaners should be avoided; incidental contact with isopropyl alcohol is acceptable only for the cleaning period described above. Published data for Accura 55 under 85 °C and 85% RH damp-heat aging is limited, so qualification tests should be performed if the part will see condensing humidity or outdoor exposure. The resin is not suitable for continuous hot water service or under-hood automotive environments without thermal isolation.
Within the Accura SLA resin family, Accura 55 is selected when the part must be opaque white, moderately stiff, and easily sanded. Accura 25 is preferred for higher elongation and lower flexural modulus; Accura Xtreme is preferred for impact-dominated housings and clips that exceed the snap-fit strain limit of Accura 55. Accura 60 is specified where translucency or polycarbonate-like visual properties are required, but it trades away some stiffness. Unlike filled systems such as Accura Bluestone, Accura 55 does not require abrasive-resistant recoater components and is less likely to settle in the vat during idle periods. Build parameters for Accura 55 should not be copied from Accura 25 or Accura Xtreme because green-state strength and leveling behavior differ. Accura 55 is not intended for direct food contact, permanent implantation, or continuous hot water service; end users must validate the finished part under applicable standards such as FDA 21 CFR 177 or ISO 10993-1:2018 when these environments are required.
