Proto3000 Formlabs Clear Cast Resin
- Название продукта: Proto3000 Formlabs Clear Cast Resin
- Сайт Factroy: Округ Юду, Ганьчжоу, Цзянси, Китай
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- Производитель: Ascent Petrochem Holdings Co., Limited
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- Proto3000 Formlabs Clear Cast Resin is typically used in formulations when viscosity, cure depth, and optical clarity, and ambient temperature, humidity, and UV exposure must be controlled within specific ranges.
| Код ТН ВЭД | 196930 |
Как аккредитованный завод прозрачной смолы Proto3000 Formlabs, мы соблюдаем строгие протоколы качества - каждая партия подвергается строгим испытаниям для обеспечения последовательных стандартов эффективности и безопасности.
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When dental laboratories replace conventional Type IV gypsum models with Proto3000 Formlabs Clear Cast Resin for aligner thermoforming, the first process variable is wash solvent residence time. Single-component photopolymer requires no A/B mixing. The resin tank should be stirred gently before the build if the material has sat idle for more than 24 h. Print settings follow the printer manufacturer’s validated dental model profile at 50 µm layer height. A dedicated resin tank and build platform reduce cross-contamination from filled or pigmented resins. After printing, the model should be washed in fresh isopropyl alcohol with a concentration of at least 99% for a period not exceeding 10 min. Longer immersion causes edge swelling and loss of occlusal detail. Post-cure in a UV chamber is then performed at 60°C for 20 min. Under-curing leaves a tacky surface that transfers to PET-G sheet during thermoforming. Over-curing increases crosslink density and makes the model brittle under clamping pressure. The printed model is used as a positive form for vacuum-formed clear aligner copolymers. Dimensional accuracy is validated against the original intraoral scan using best-fit alignment software. Final aligner materials must meet the relevant requirements of ISO 20795-1:2013. The resin model itself is not a patient-contact device and therefore falls outside the scope of a full EN ISO 10993-1:2020 evaluation. Batch traceability of the resin lot should be recorded because thermoforming temperature profiles vary between 0.5 mm and 0.75 mm sheet thicknesses.
Why Does Flask Thermal Lag Govern Burnout Schedules for Clear Cast Resin?
In lost-wax investment casting, the critical downstream conflict is not the decomposition temperature of the resin but the offset between furnace setpoint and flask core temperature. A gypsum-bonded investment flask with a 50 mm diameter exhibits thermal lag that can exceed 30°C during ramp stages. Published data for this specific configuration is limited. Foundries therefore insert thermocouples into trial flasks before committing production patterns. The resin pattern should be printed solid or with a high-density infill. Hollow patterns can collapse during investment pouring if wall thickness falls below 1.5 mm. Investment powder-to-water ratio is typically held at 100:40 by mass for gypsum-bonded materials used with precious metal alloys. For high-melting Co-Cr alloys, phosphate-bonded investment at 100:22 to 100:25 by mass is preferred. Burnout must be conducted in two stages. The first stage removes methacrylate monomers and volatile organic fragments. The second stage oxidizes residual carbon. Ramp rates above 2°C/min generate pressure inside the investment and cause cracking. Hold times below one hour at the intermediate plateau leave residual carbon that contaminates the molten alloy and creates gas porosity in the casting. Ash content after burnout is checked by ASTM D5630 and should fall below 0.1 wt% for precious metal applications. Flask removal and casting temperatures vary by alloy family. Fourteen-karat gold is flask-cast near 950°C while Co-Cr requires higher flask temperatures. Terminal cast products include jewellery settings, dental removable partial framework patterns, and low-volume orthopaedic prototype components. Users must not assume that the burnout protocol for wax can be transferred unchanged. The filled methacrylate chemistry demands a dedicated thermal profile that is validated for the specific flask size and investment chemistry.
| Stage | Setpoint range | Ramp rate | Hold period | Process function |
|---|---|---|---|---|
| 1 | 280–320°C | ≤2°C/min | 60–120 min | Volatilize monomers and low-molecular-weight fragments |
| 2 | 700–750°C | ≤2°C/min | 120–180 min | Oxidize residual carbon and prepare mold for casting |
Production-scale casting departments observe that batch-to-batch variation in resin ash content is not visible from printed part appearance. A clear pattern can leave higher carbon residue if post-cure parameters drift. Inline process control therefore requires a burn-off test coupon of fixed mass before a new resin lot is released. Investment permeability also matters. Dense patterns block gas escape when the polymer expands at higher temperatures. A venting sprue diameter of 3 mm or greater is used on parts with large cross sections. For parts thicker than 8 mm, the ramp rate should be reduced to 1°C/min and the intermediate hold extended to the upper limit. If casting weight exceeds 20 g, metal casting temperature may need to be raised to compensate for heat loss through extended sprue geometry. These are operational boundaries. Suppliers may recommend different settings based on their investment formulation and alloy selection.
For microfluidic layer stacks, surface energy and channel sidewall transparency create functional limits before the first fluid enters the device. Proto3000 Formlabs Clear Cast Resin is printed at 25 µm layer height to reduce stair-stepping in channels below 400 µm width. The part must be washed thoroughly in fresh solvent. Trapped uncured resin inside closed channels causes blockages and later leaches into aqueous test fluids. A low-pressure syringe flush is used after primary washing. Post-cure in a UV chamber is continued until channel wall surfaces become non-tacky. The resulting transparent manifold prototypes allow visual inspection of bubble nucleation, sedimentation, and two-phase flow. Compliance for laboratory equipment is usually limited to REACH and RoHS 2011/65/EU. No medical claim should be attached unless extractables testing under ISO 10993-12:2021 is completed. In cell culture studies, a leachable can suppress cell adhesion or introduce cytotoxicity in the 24 h elution assay. The resin is therefore more commonly used for flow visualisation rigs, fluidic manifolds, and master moulds for PDMS chips. PDMS slabs are cast against the printed master after a silane anti-adhesion treatment. Silane treatment is prepared at 1% v/v in ethanol. Excess reagent is rinsed after 5 min. The master is not autoclaved above 121°C because thermal distortion can destroy channel geometries. For long experiments in aqueous media, the printed part should be coated or replaced with a castable material after the prototype validation stage.
Platinum-Cure Silicone Inhibition Traces Back to Residual Photoinitiator in the Printed Master
When Proto3000 Clear Cast Resin is used as a master for platinum-cure RTV silicone, cure inhibition can appear as a tacky interface layer after 24 h. The inhibition is caused by residual photoinitiator and unreacted monomer migrating into the liquid silicone. This failure mode is observed especially on printed surfaces that were not fully post-cured. The countermeasure is not to increase catalyst dose indefinitely. Instead the master is post-cured at 80°C for 2 h, followed by a UV exposure cycle under nitrogen or a clear acrylic barrier coat. Tin-cure condensation silicones are less sensitive to inhibition and are used as a barrier layer. Mixing ratios for addition-cure RTV silicone are commonly 10:1 by weight Part A to Part B. Tin-cure RTV materials are mixed at 100:5 by weight base to catalyst. Vacuum degassing of the mixed silicone at −0.1 MPa for 5–10 min is required before pouring. The printed master should be coated with a water-based release agent and allowed to dry fully. Traces of isopropyl alcohol left in surface pores can slow cure at the interface. Production-scale mould shops run a small compatibility test on each new resin lot because photoinitiator residuals vary by batch. If a platinum-cure silicone lot does not set in contact with the test master, the mould is restricted to tin-cure silicone or the master receives an additional thermal post-cure. Terminal moulds are used to cast polyurethane prototypes, epoxy tooling fixtures, and low-durometer elastomer gaskets. For medical training models that contact intact skin, ISO 10993-5:2009 may apply to the final silicone. The master resin itself is not used in patient contact.
Light Pipe Prototype Fabrication and Surface Polish Conditioning
Transparent light pipes require a low-scatter output surface. Printed layer lines on the internal reflection path create optical hotspots and reduce luminous intensity at the exit face. The printed part is therefore wet-sanded through 600, 800, 1200, 2000, and 3000 grit in a single direction. Polishing is completed with an acrylic clear coat. Haze and luminous transmittance are measured with ASTM D1003 and ISO 13468-1:2019. The resin is not an optical grade material. Published data for this specific configuration is limited. Yellowing can occur during long UV-A exposure unless a UV-blocking clear coat is applied. For automotive interior prototypes, the printed light pipe is used in dashboard indicator arrays, ambient lighting guides, and sensor cover mock-ups. The part is not used in exterior lighting without accelerated weathering data. Samples should be exposed according to ASTM G154 Cycle 1 for screening. Peak irradiance, black panel temperature, and exposure time must be logged for each batch. If total transmittance falls below the design threshold after 500 h, the part is disqualified from extended validation. Mounting bosses should be printed solid to avoid sink marks on optical surfaces. Thread-forming screws should not be used directly in the resin. Brass inserts are installed with heat-staking tools to reduce stress cracking.
When Transparent Resin Masters Survive Vacuum Casting Demoulding Without Microfracture
For low-volume polyurethane housings, the printed master must survive silicone moulding and subsequent demoulding without microcracks. The master is thick-walled and reinforced at split lines because the silicone elastomer grips vertical walls during demoulding. Two-part polyurethane casting resins are typically mixed at 1:1 by volume or 100:100 by weight depending on the supplier. The vacuum casting machine degasses the mixture at −0.1 MPa before pouring. Moulds are often operated at 60°C to lower viscosity. Proto3000 Clear Cast Resin masters should be fully post-cured before moulding. Residual monomer can stain the silicone or migrate into the cast polyurethane surface. The printed master is not suitable for continuous production exceeding 20–30 mould pulls because surface degradation will transfer to the cavity. This is an operational boundary, not a defect. For electrical housings, final plastic parts must meet RoHS 2011/65/EU and REACH SVHC disclosure. If the housing is used in medical devices, the cast polyurethane must be assessed under ISO 10993-1:2020, not the master resin. Proper part design uses draft angles of at least 2° on tall features. Ejector geometry avoids undercuts that exceed the elongation limit of the transparent master. Terminal products include functional enclosures, pump housings, and human factors test units.
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- Proto3000 Formlabs Clear Cast Resin Производится в соответствии с системой качества ISO 9001 и отвечает соответствующим нормативным требованиям.
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Proto3000 Formlabs Clear Cast Resin is supplied as a methacrylate photopolymer in 1 L cartridges with an identification tag that locks the Low Force Stereolithography profile on Form 3, Form 3B, and Form 3L platforms. The material is positioned between standard clear photopolymer and dedicated castable wax resin: it retains sufficient optical transmission after post-cure for visual inspection of internal channels, while its thermal decomposition profile is intended to reduce residue formation during investment casting burnout compared with standard clear resins. The cartridge format eliminates open-tray liquid handling and reduces batch-to-batch moisture exposure. Available print layer heights on the LFS platform are 25 µm, 50 µm, and 100 µm, with the 25 µm setting recommended for microchannel reproducibility and small jewelry patterns. The material is not certified for direct food contact or long-term skin contact.
How Does the Cartridge Recognition Profile Constrain Viscosity and Recoat Behavior?
The Low Force Stereolithography optical train uses a 405 nm laser and a flexible bottom tank to reduce peel forces, but recoating remains sensitive to the resin’s temperature-dependent viscosity. The manufacturer recommends conditioning the cartridge at 18–28°C before printing. At the lower end of this range, viscosity rises sufficiently to produce drag lines on 25 µm layers and to increase down-facing surface roughness. Service records from Form 3B production benches indicate that cartridges stored below 18°C may fail the resin-level validation step until conditioned at 22–25°C for at least 4 h. The resin profile compensates within a narrow band of 18–28°C; outside this band, layer thickness uniformity can vary by more than ±10% on flat spans longer than 80 mm in the x-axis. The formulation is lightly stabilized against settling; a gentle inversion of the cartridge is recommended if storage has exceeded 2 weeks.
After removal from the build platform, green parts retain a film of uncured resin that must be removed by two-stage immersion in ≥99% isopropanol or tripropylene glycol monomethyl ether. Form Wash agitation for 20 min at 23°C is the standard benchmark for parts with wall thickness below 5 mm; blind sprues and channels below 1 mm diameter may require a second 5 min bath with fresh solvent to avoid white residue after post-cure. Compressed air at 0.2–0.4 MPa should be used to clear internal cavities, because solvent retention produces microcracking during thermal post-cure. Post-cure in a Form Cure unit at 60°C for 30 min raises tensile modulus and stabilizes solvent uptake, but it also increases crosslink density. For investment casting patterns, the user must not exceed 60°C or 30 min unless the foundry specifically requests higher mechanical strength; excessive post-cure shifts the burnout residue toward carbonaceous deposits that are harder to eliminate at standard ramp rates.
Optical clarity after post-cure is strongly dependent on wash solvent purity. When the isopropanol bath exceeds 10% dissolved resin by weight, the final surface can develop a white haze that cannot be removed by prolonged post-cure. For transparent fluidic prototypes, a solvent exchange with fresh ≥99% isopropanol followed by air drying at 23°C for 30 min before post-cure is required. Internal channel surfaces below 1 mm in diameter may require syringe flushing at 0.1 MPa because passive diffusion alone leaves a residual monomer film that yellows under UV exposure.
Burnout Schedules and the Residual Ash Constraint in Gypsum-Bonded Investment
The main process difference from standard clear photopolymer is that Clear Cast Resin is expected to leave lower residual inorganic ash after burnout in gypsum-bonded investment shells. Dedicated castable wax resins are optimized for ash contents below 0.03 wt% in manufacturer literature; Clear Cast Resin should be treated as a low-to-moderate residue photopolymer rather than a zero-ash wax replacement. The burnout profile must include a low-temperature plateau to volatilize methacrylate fragments before the investment shell reaches its critical thermal stress window. A commonly used profile for methacrylate patterns begins with a ramp of 3°C/min from ambient to 230°C, a 30 min hold at 230°C, then a ramp of 2°C/min to 730°C and a 3 h hold at 730°C. Patterns with thick cross-sections above 6 mm should extend the 230°C plateau to 60 min to prevent internal pressure rise from vaporized monomer. When the resin is post-cured at 60°C for only 30 min, burnout is generally clean under this profile; when post-cure is extended to 120 min, the higher crosslink density shifts decomposition to higher temperatures and can generate residual carbon in small internal channels.
The difference between Clear Cast Resin and standard clear resin becomes most visible at the investment casting interface. Standard clear resin leaves inorganic residues that appear as dark surface inclusions on cast metal and is not recommended for burnout. Dedicated castable wax is opaque and brittle, with tensile strength typically below 20 MPa, which limits handling of thin-walled patterns. Clear Cast Resin retains a transparent green state that allows detection of internal voids and support marks before investing; after a controlled 30 min post-cure, its handling strength is closer to that of a standard clear resin than to wax.
Mechanical benchmarks for the standard clear resin baseline are summarized in Table 1. The Clear Cast Resin is expected to fall within the same strength class under the manufacturer’s standard post-cure, but independent data for the cast-specific blend are limited. Users should treat these values as engineering reference points rather than guaranteed product specifications.
| Property | Method | Nominal value |
|---|---|---|
| Ultimate tensile strength | ASTM D638-14 | 65 MPa |
| Tensile modulus | ASTM D638-14 | 2.8 GPa |
| Elongation at break | ASTM D638-14 | 6.2% |
| Flexural strength | ASTM D790-17 | 83 MPa |
| Flexural modulus | ASTM D790-17 | 2.2 GPa |
| Notched Izod impact | ASTM D256-10 | 25 J/m |
| Heat deflection temperature at 0.45 MPa | ASTM D648-18 | 58.4°C |
| Shore hardness | ASTM D2240-15 | 85 D |
| Density | ASTM D792-20 | 1.10 g/cm³ |
| Visible light transmittance at 550 nm through 3 mm | Manufacturer internal method | >85% |
Mechanical anisotropy in LFS parts arises from interlayer conversion. Coupons built flat in the XY plane often show higher tensile values than coupons built upright because failure propagates between layers. For Clear Cast Resin patterns under bending load, the critical gate area should be oriented parallel to the XY plane. Where Z-axis loading cannot be avoided, the reference tensile value should be derated by 20–30% unless validation data are available. This anisotropy also affects burnout behavior: upright sections expand along the Z-axis differently than flat sections, which can alter shell stress distribution around gate junctions.
When Downstream Thermal and Chemical Limits Reduce Application Breadth
Cured Clear Cast Resin parts are not suitable for continuous service above 58°C under load, because heat deflection temperature under 0.45 MPa is 58.4°C for the standard clear resin baseline. This thermal boundary rules out autoclave sterilization at 121°C and limits exposure to hot water or steam lines. Chemical exposure should be limited to short-term water, neutral pH solutions, and dilute alcohols. Ketones, chlorinated solvents, and strong alkaline solutions cause swelling or surface attack; for example, immersion in acetone at 23°C visibly softens the surface within 15 min, so solvent cleaning must be limited to isopropanol or ethanol. For microfluidic prototypes handling aqueous buffers, a 24 h water soak at 23°C does not produce measurable dimensional change beyond 0.2% in wall sections of 2 mm; however, continuous water exposure above 40°C should be validated because hydrolytic degradation of methacrylate networks accelerates with temperature. Published ASTM D543 chemical resistance data for this specific blend are limited, so compatibility trials with the actual process solvent are required before production use.
Part orientation determines the effective cross-section during burnout. Vertical sprues show lower risk of shell cracking than large horizontal slabs because the thermal expansion path is shorter. Support density on the down-facing surface should follow the manufacturer’s default for 50 µm; users frequently reduce touchpoint size to 0.4 mm for jewelry patterns below 4 g. Support removal on thin-walled patterns should be performed before post-cure, when the green state is less brittle; after post-cure, cutting supports with a saw rather than diagonal pliers prevents crack initiation at the gate.
| Attribute | Standard Clear Resin | Proto3000 Formlabs Clear Cast Resin | Dedicated Castable Wax Resin |
|---|---|---|---|
| Green-state optical clarity | Transparent | Transparent to translucent | Opaque |
| Typical tensile strength | 65 MPa under ASTM D638-14 | No independent published dataset; manufacturer positions near clear resin baseline | <20 MPa |
| Burnout suitability for gypsum investment | Not recommended; inorganic residue remains | Controlled low-residue profile; needs extended 230°C hold for sections above 6 mm | Optimized for low residue |
| Post-cure requirement | 60°C for 30 min | 60°C for 30 min maximum for casting; shorter where wax-like burnout is preferred | Usually none before burnout |
| Typical application | Optics, fluidic manifolds, transparent housings | Visual inspection casting patterns, hybrid prototypes, low-volume metal casting | High-volume jewelry and dental lost-wax casting |
Unopened cartridges should be stored at 10–25°C and protected from light; exposure to temperatures above 30°C accelerates photoinitiator degradation and reduces polymer gel fraction. Opened cartridges should be used within 6 months or purged with dry nitrogen, because ambient moisture uptake at relative humidity above 60% increases surface tack on printed parts and reduces burnout consistency. Cartridge labels should not be altered; the LFS system’s optical reader uses the tag to enforce the correct print profile, and tag damage results in the resin being rejected by the machine. Batch-to-batch variance in low-volume casting patterns is minimized when the same lot is used for the entire tree assembly.
Compliance documentation supplied by Proto3000 includes REACH and RoHS declarations. The material is not formulated with intentionally added cytotoxic monomers; however, uncured resin should be handled with nitrile gloves because methacrylate monomers can cause skin sensitization. Do not mix with amine-based additives or uncured epoxy resins, because exothermic reactions can destabilize the cartridge and increase the risk of premature polymerization. ISO 10993 biological evaluation data are not published for this blend in the current revision of the safety data sheet, so applications involving tissue contact require separate validation.
The product is best assigned to short-run investment casting and prototype work where the pattern must be inspected visually before investing and where the foundry can maintain the prescribed 230°C plateau. Extended production casting of high-volume jewelry trees may still favor a dedicated castable wax resin because its burnout ash specification is tighter and its thermal expansion is lower. The operational boundary is therefore set by the foundry’s ability to hold the low-temperature plateau for sections above 6 mm and by the requirement to keep post-cure at 60°C for no more than 30 min for burnout-bound parts.
