DSM Somos 9120
- Название продукта: DSM Somos 9120
- Сайт Factroy: Округ Юду, Ганьчжоу, Цзянси, Китай
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- Производитель: Ascent Petrochem Holdings Co., Limited
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- DSM Somos 9120 is typically used in formulations when resin viscosity and cure temperature must be controlled within specific ranges.
| Код ТН ВЭД | 777487 |
Как аккредитованный завод DSM Somos 9120, мы соблюдаем строгие протоколы качества - каждая партия подвергается строгим испытаниям для обеспечения последовательных стандартов эффективности и безопасности.
| Упаковка | DSM Somos 9120 comes in a 1 kg opaque plastic bottle with screw cap, sealed and labeled with safety warnings. |
| Погрузка контейнера (20-футовый контейнер) | 20′ FCL loaded with palletized DSM Somos 9120 chemical packages, shrink-wrapped, strapped, and secured for safe ocean transport. |
| Доставка | DSM Somos 9120 is a liquid stereolithography resin. It is generally not regulated as dangerous goods for transport under DOT, IATA, or IMDG. Ship in sealed, labeled containers away from heat, light, and freezing; follow the current SDS and local regulations. |
| Хранение | Store DSM Somos 9120 in its original, tightly closed container in a cool, dry, well-ventilated area, away from direct sunlight, UV light, heat, sparks, and open flames. Recommended storage temperature is 15–25°C (59–77°F). Do not freeze. Keep separate from strong acids, bases, and oxidizing agents. Ensure containers are labeled and inspect for leaks. |
| Срок годности | DSM Somos 9120 typically has a 12-month shelf life when stored unopened at 18–25°C, protected from light, heat, and moisture. |
In wind tunnel model construction, the epoxy-based Somos 9120 resin is produced on laser scanning systems operating at 355 nm with layer thicknesses from 0.050 mm to 0.150 mm. The build file uses a high hatch density and a fill orientation aligned with the dominant aerodynamic bending axis, because interlayer adhesion in the green state is lower than in the fully cured state. Manufacturer-published mechanical data under ASTM D638-14 list tensile modulus near 9,000 MPa, and ISO 75-2:2013 heat deflection temperature at 0.46 MPa is reported between 110 °C and 125 °C after thermal post-cure. The unpost-cured green part exhibits lower heat deflection and lower modulus; therefore, strain-gauge validation must be performed only after the full UV and thermal cure cycle. Thermal post-cure volumetric shrinkage in the range of 0.5 % to 1.2 % is compensated by scaling the CAD file before slicing. Pressure tap holes and hinge slots are machined after post-cure, because machining green material causes edge chipping and microcracking around hole peripheries. For surface finish, the 0.050 mm to 0.150 mm layer striation is removed by CNC machining and wet sanding with 400-grit and 600-grit abrasives, followed by a two-part urethane clear coat to achieve a surface roughness below 0.8 µm Ra determined in accordance with ISO 4287. Sting balance attachment zones are drilled after cure and fitted with bonded aluminum inserts; direct threading into the polymer under cantilever bending has been observed to crack the first threads in production-scale tunnel programs. The dominant failure mode in repeated tunnel cycles is not gross fracture but interlayer separation along the trailing edge of suction-side surfaces. This is reduced by orienting the part so the layer normal is not parallel to the chordwise bending axis. Published aerodynamic load limits for Somos 9120 wind tunnel models are limited; the safe dynamic pressure envelope is established program-specific by correlating tunnel strain gauge data with the tensile elongation values determined under ASTM D638-14 and flexural strain under ASTM D790-17.
What Limits Insert Durability in Low-Volume Injection Molding Trials?
Direct use of cured Somos 9120 as a cavity insert is confined to low-volume validation runs because its thermal conductivity is approximately an order of magnitude lower than that of aluminum and several orders of magnitude lower than that of P20 tool steel. The insert is mounted in an aluminum bolster and cooled by parting-line conduction only; melt contact temperature is held below 250 °C and injection pressure below 150 MPa for unfilled amorphous grades such as ABS and polystyrene. Shot count per insert is typically capped at 50 cycles because gate erosion, not cavity wear, is the first failure mode. The gate is machined into a replaceable aluminum sub-insert to avoid replacing the entire photopolymer cavity when shear rates above 10,000 s⁻¹ soften the gate region. Packing pressure is reduced relative to steel tooling because the cavity deforms elastically under clamp load; a parting-line opening larger than 0.02 mm causes flash, which then prevents clean ejection. Ejection pins do not bear directly on the photopolymer surface; they act on the bolster while the insert retains only part geometry. The higher coefficient of thermal expansion of cured Somos 9120 compared to aluminum requires the bolster to be preheated before final bolt torque; otherwise thermal expansion shear loads crack the counterbores. Inserts receiving only UV post-cure fail on first contact with elevated melt temperature by viscoplastic deformation of the cavity face. A thermal post-cure at 80 °C to 120 °C for 2 h to 4 h after UV cure raises the modulus and reduces the softened surface layer depth. Coordinate measuring machine inspection relative to machined datum bores should be performed after 20 cycles; average cavity shift greater than 0.05 mm indicates the process window has been exceeded. Published tool-life data for Somos 9120 in production injection molding are limited, and transfer from single-cavity prototypes to multi-cavity tools is not recommended without a hybrid metal frame.
For room-temperature vulcanization silicone tooling master patterns, the surface condition of cured Somos 9120 determines whether the platinum-catalyzed silicone cure is inhibited. The master is thermally post-cured before use to minimize residual unreacted monomer and low-molecular-weight components that can migrate into the silicone and interfere with crosslinking. The pattern is then sealed with a two-part epoxy or acrylic clear coat and polished to remove the 0.050 mm to 0.100 mm layer striation. Cure of the silicone is conducted at 20 °C to 60 °C for 8 h to 24 h; these temperatures do not alter the master dimensions if the pattern has already undergone thermal post-cure above 80 °C. Mold release selection is limited to dry polytetrafluoroethylene sprays or non-reactive silicone-free agents, because solvent-borne releases can swell the cured epoxy network at the pattern surface. Vacuum degassing of the mixed silicone at 10 kPa to 20 kPa reduces air entrapment at fine ribs and lettering. Pattern life is governed by demolding tear in high-aspect-ratio features; radii below 0.25 mm on the master are reinforced with a 2 mm to 3 mm fillet in the CAD model to prevent chipping during repeated silicone removal. Master dimensional stability is monitored by comparing reference points against the original CAD file after every 10 silicone pours. Published data specific to Somos 9120 pattern life in platinum-catalyzed silicone service are limited; the observed failure mode in practice is progressive rounding of sharp edges rather than bulk fracture.
Thermal Post-Cure Determines the Underhood Connector Validation Envelope
Underhood connector housings built from Somos 9120 are evaluated for terminal retention and snap-fit engagement only after the resin has received the full UV and thermal post-cure protocol. The principal material requirement is not tensile strength but dimensional stability of latch geometry after thermal aging. Manufacturer-published heat deflection temperature under ISO 75-2:2013 at 0.46 MPa in the range of 110 °C to 125 °C supports short-term exposure to engine compartment air temperatures, but terminal insertion forces and latch flexure require separate evaluation under ASTM D638-14 flexural and tensile protocols. The main failure mode in mated connector trials is stress cracking at the root of the cantilever latch after repeated mating cycles. Rib thickness below 1.0 mm at the latch root increases local stress concentration; the CAD design is modified to maintain at least 1.5 mm root thickness while preserving the snap-fit deflection angle. Terminal insertion holes are machined after post-cure rather than built directly at small diameter, because built holes below 1.5 mm exhibit closed-hole tolerance shift after thermal cure. Electrical clearance and creepage testing is performed in accordance with the relevant IEC 60664 series when the connector is intended for live testing. Thermal aging at 105 °C for 500 h followed by visual inspection under 10X magnification is used to detect microcracks around metal terminal bores. Because the coefficient of thermal expansion of cured Somos 9120 is higher than that of copper alloy terminals, thermal cycling from -40 °C to 120 °C with a 30 min dwell time can produce differential expansion strain at the insert interface. This is managed by specifying a 0.10 mm to 0.15 mm clearance around terminal retention clips and by using a compliant silicone seal at the wire entry. Published long-term thermal oxidative aging data for Somos 9120 connector bodies are limited; therefore, service validation for production underhood connectors should include oven aging to the specific mission hour requirement.
Continuous immersion testing of cured Somos 9120 fluid manifold prototypes is conducted before any flow bench or vehicle-mounted evaluation. The epoxy network of the cured resin is strongly influenced by the post-cure conversion; insufficient thermal post-cure leaves residual oxirane groups that are vulnerable to attack by hot water and aqueous glycol solutions. Test plaques are immersed according to ASTM D543-21 and then evaluated for mass change, visual cracking, and tensile property retention under ASTM D638-14. Internal flow channels are machined or built with removal of the 0.050 mm to 0.100 mm layer striation, because surface roughness in small channels alters pressure drop and creates nucleation sites for coolant boiling. Pressure leak testing is performed with dry nitrogen at 300 kPa to 400 kPa after thermal cycling, because the polymer-to-metal sealing interface can shift due to differential thermal expansion. Flanged joints are backed with elastomeric gaskets rather than relying on the photopolymer flange surface alone. Thermal cycling from -40 °C to 120 °C is performed at a ramp rate no greater than 2 K/min to avoid thermal shock cracking at inlet and outlet fillets. The following immersion matrix is used to generate application-specific compatibility data; published equilibrium mass uptake values for Somos 9120 in all listed fluids are limited, so each program must generate comparative retention curves rather than relying on catalog values.
| Fluid class | Test temperature | Immersion duration | Post-exposure measurement |
|---|---|---|---|
| Deionized water | 60 °C | 168 h | Mass change, ASTM D543-21 |
| 50/50 glycol-water coolant | 105 °C | 72 h | Mass change, visual cracking, ASTM D638-14 tensile retention |
| SAE 15W-40 mineral oil | 90 °C | 72 h | Hardness change, ISO 75-2:2013 HDT retention |
| Diesel fuel | 40 °C | 24 h | Mass change, warpage, ASTM D543-21 |
When Epoxy Photopolymer Replaces Metal in Vacuum Thermforming Fixtures
Vacuum forming tools built from Somos 9120 replace machined aluminum only when sheet contact temperature is below the heat deflection boundary of the cured resin and when cycle rate is not the primary production measure. The tool face is sealed after post-cure with a high-temperature epoxy tooling sealant to close microscale porosity and to prevent vacuum leakage through the stereolithography laminate. Vacuum channels are machined into the back side of the tool and connect to a manifold; the tool face is drilled with 0.5 mm to 0.8 mm vacuum holes after sealing. The low thermal conductivity of the polymer relative to aluminum extends cycle time, and the mold body is fitted with an aluminum heat sink plate behind the sealing coat to improve heat removal. For high-gloss part surfaces, the tool face is polished to 0.4 µm Ra or lower as measured according to ISO 4287, and the surface is re-coated after every 100 forming cycles because the epoxy surface is scratched by repeated sheet contact. Forming temperatures for amorphous thermoplastics such as ABS and HIPS are held below 200 °C at the sheet surface; contact time with the photopolymer tool is kept below 5 s before vacuum draw. The tool frame is bolted to the platen with a floating attachment that accommodates the higher thermal expansion of the photopolymer body. Dimensional stability of the formed part is monitored by comparing trim-line datum points against the aluminum sheet prior to forming. Warpage of the photopolymer tool after repeated cycles appears first as a loss of vacuum at the periphery, not as bulk cracking. Published data for Somos 9120 tooling life in vacuum forming is limited; the main field-observed failure mode is gradual enlargement of vacuum holes and surface wear at high-draft-angle regions.
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- DSM Somos 9120 Производится в соответствии с системой качества ISO 9001 и отвечает соответствующим нормативным требованиям.
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DSM Somos 9120 is an epoxy-based liquid photopolymer formulated for vat photopolymerization stereolithography systems operating at a nominal laser wavelength of 355 nm. The product is supplied as a reactive liquid resin intended for use in sealed, recirculating build chambers where exposure to ambient ultraviolet and visible light is controlled. In production stereolithography equipment, the resin bath is typically held within the manufacturer-recommended thermal window of 28–32 °C, and layer thickness settings are commonly selected between 0.05 mm and 0.15 mm depending on vertical resolution, feature size, and post-cure distortion control. The cured material is not specified for optical transparency and is positioned as an opaque, general-purpose engineering photopolymer for functional prototypes, jigs, fixtures, and master patterns. Because the material is supplied as a multi-component reactive system, batch acceptance is not based solely on a single viscosity or density value; supplier certificates commonly report liquid viscosity, liquid density, cured density, and mechanical properties generated under defined specimen preparation and conditioning protocols.
For mechanical characterization, DSM Somos 9120 is evaluated within a thermoset stereolithography test matrix. Tensile properties are measured according to ASTM D638-14 using Type I specimens, flexural properties according to ASTM D790-17 under three-point loading, notched impact resistance according to ASTM D256-10, and heat deflection temperature according to ASTM D648-18 at both 0.46 MPa and 1.82 MPa. Density data are commonly reported under ISO 1183-1:2019, while viscosity is controlled at 30 °C using cone-plate instrumentation aligned to ISO 2884-1 or equivalent spindle-based methods. These standard designations are not interchangeable; each method imposes specific specimen size, loading rate, thermal ramp rate, and conditioning requirements that influence the reported result. Published data for this specific configuration is limited in some orientation-dependent cases, and design engineers should not transfer a single datasheet value directly into finite-element simulation without confirming batch-specific certificates and build orientation factors.
Material Composition and Mechanical Characterization Standards
Cured specimens of Somos 9120 are conditioned at 23 ± 2 °C and 50 ± 5 % RH before mechanical testing unless the governing standard specifies otherwise. For tensile and flexural evaluations, the layerwise nature of vat photopolymerization introduces anisotropy that is not captured by a single in-plane test result. Specimens machined from vertically oriented builds can differ from horizontally oriented builds in strength and elongation because of interlayer conversion gradients and residual stress accumulation. The datasheet structure therefore reports nominal values that are most useful for comparative screening rather than absolute design allowables. When critical snap-fit or load-bearing features are produced from Somos 9120, orientation-specific testing under ASTM D638-14 and ASTM D256-10 should be repeated on the intended build platform and at the intended post-cure state.
The resin’s cured-state hardness is typically recorded on the Shore D scale in accordance with ASTM D2240-15, although hardness alone does not substitute for modulus or impact data. Dimensional stability evaluations under thermal load use the deflection temperature method of ASTM D648-18, with oil bath heating at 2 °C/min and edgewise loading. Because the material is thermoset and unfilled, creep and thermal softening are governed by crosslink density and residual conversion rather than crystalline melting behavior. For liquid handling, viscosity is not a fixed material property across all conditions; it is temperature-sensitive and may increase if resin is stored at low temperature or contaminated with partially polymerized material during build operations.
The following matrix lists the principal characterization methods used for Somos 9120 and similar stereolithography resins. The table does not replace the supplier-controlled datasheet but identifies the test conditions most frequently encountered in batch release and application validation.
| Characterization target | Standard method | Typical condition |
|---|---|---|
| Tensile modulus, strength, elongation | ASTM D638-14 | 23 ± 2 °C, 50 ± 5 % RH, Type I specimen |
| Flexural modulus and strength | ASTM D790-17 | Three-point loading, span-to-depth ratio 16:1 |
| Notched Izod impact | ASTM D256-10 | Notched specimen, pendulum impact |
| Heat deflection temperature | ASTM D648-18 | 0.46 MPa and 1.82 MPa, heating ramp 2 °C/min |
| Density | ISO 1183-1:2019 | Liquid or cured solid by immersion or gas pycnometer |
| Viscosity | ISO 2884-1 | Cone-plate at 30 °C |
For batch-to-batch comparison, the supplier commonly reports viscosity at a controlled temperature because excessive viscosity drift in large vats changes recoating behavior and can cause build-plane swelling. Incoming resin should be inspected for gel particles, pigment settling, or stratification before transfer to the process vat. If a container has been stored below the recommended temperature, it should be conditioned in the sealed original container until the resin reaches the equipment operating range. Direct heating on open containers is not recommended because it can create localized polymerization and moisture uptake.
What Processing Constraints Govern Production-Grade Builds?
At the production vat, temperature control is a first-order parameter for Somos 9120 because photopolymerization rate and resin viscosity respond to thermal variations. If the resin temperature falls below the lower operating boundary, laser scan speed can exceed the local cure capacity, producing undercured layers and interlayer delamination. If the resin temperature rises above the upper boundary, dark-cure progression may accelerate and alter vat life. On production stereolithography lines with recirculating vats, batch-to-batch viscosity variation and ambient light ingress are common root causes for build-plane swelling, surface tack, and dimensional drift.
Recoating behavior is influenced by resin rheology and wiper gap. For unfilled epoxy-based resins such as Somos 9120, the recoater settings are selected to produce a uniform fresh layer without starving fine features or flooding deep recesses. Interruption of recirculation for extended periods can produce resin stratification and local viscosity inhomogeneity, particularly in large vats. Operators should monitor resin level, wiper condition, and vat temperature before committing high-value builds. Laser power calibration at 355 nm should be performed with a beam profiler or manufacturer-recommended power meter, because a drifting laser output changes cure depth and scan widths even when the resin specification remains unchanged.
Resin contamination control is critical. Amine-containing solvents, some release agents, and certain moisture-scavenging additives should be kept out of the resin bath. Basic species can inhibit cationic propagation and leave undercured surfaces or tacky sidewalls. Alcohol rinsing is standard for green part cleaning, but solvent residue must be evaporated or removed before post-curing; trapped solvent can plasticize the surface and distort thin sections. When build chamber relative humidity exceeds 60 % RH, moisture uptake may increase surface tack on green parts and prolong post-cure time. In high-humidity production environments, dry air purge or resin conditioning should be evaluated as part of the work instruction.
Post-cure practice strongly influences final conversion, thermal resistance, and residual stress. UV post-cure chambers operating in the 365–405 nm range are typical for epoxy-based stereolithography resins, but the required dose is machine- and mass-dependent. Thermal post-cure may be combined with UV exposure to advance conversion in thick sections; however, dense packing of green parts can lead to non-uniform irradiance and exotherm accumulation. For dimensionally critical components, post-cure fixtures or sacrificial supports should be retained until the part reaches ambient temperature. Published data for this specific configuration is limited when high-aspect-ratio parts are post-cured without support constraints, so iterative dimensional validation is required.
Application Envelopes and Limitations
Applications for Somos 9120 include opaque functional prototypes, assembly fixtures, inspection gauges, and master patterns for room-temperature vulcanizing silicone tooling. Snap-fit and clip prototypes require assembly force predictions anchored to ASTM D256-10 impact data and ASTM D638-14 tensile elongation values. Because the material is not designed for optical clarity, light-transmitting components, lens prototypes, and flow-visualization models should be directed to clear stereolithography grades such as DSM Somos WaterShed XC 11122 or equivalent optical formulations.
The product is not specified for food-contact, potable-water, or medical-implant use without explicit regulatory confirmation for the specific grade and post-cure state. Users requiring REACH, RoHS, or FDA 21 CFR compliance should request current regulatory statements from the supplier for the exact batch and packaging configuration. Dimensional changes from residual dark-cure progression may continue after initial post-cure if parts are exposed to elevated temperature during storage or service. Components intended for continuous service above the heat deflection temperature should be evaluated under load, because ASTM D648-18 is a deflection test and not a continuous-use temperature rating.
For tooling masters and silicone mold patterns, surface condition is often more critical than bulk mechanical properties. Somos 9120 parts can be sanded, primed, and finished with standard SLA post-finishing operations, but aggressive solvent wiping with ketones or chlorinated solvents may attack the cured surface. Compatibility with production fluids should be tested using immersion coupons per ASTM D543-21 or a user-specified chemical resistance protocol. For investment casting patterns, burnout ash content and thermal expansion must be validated for the specific shell system and furnace profile; published data for this specific configuration is limited and should not be assumed from general stereolithography resin behavior.
When DSM Somos 9120 Replaces Glass-Filled Nylon in Short-Run Masters
Relative to glass-filled nylon used in conventional machining, Somos 9120 offers a direct digital route for short-run masters with reduced tooling lead time and no grain-direction delamination risk associated with laminated or billet stock. However, the replacement is not a direct material substitution for load-bearing production components. The stereolithography resin is a thermoset and does not exhibit the same yielding, moisture-conditioned toughness, or service temperature behavior as glass-filled polyamide. Designers should compare ASTM D638-14 tensile data and ASTM D256-10 impact data for both material classes before committing to the substitution.
Against other Somos photopolymers, 9120 is positioned as a general-purpose material rather than a specialty optical or high-temperature grade. Unlike DSM Somos WaterShed XC 11122, the formulation is not intended for clarity or low water sorption applications. Unlike DSM Somos PerFORM, which is ceramic-filled and targeted at high stiffness and elevated heat deflection temperature, Somos 9120 is unfilled and should not be expected to match those high-modulus benchmarks. Compared with impact-modified resins such as Somos NeXt or Somos Taurus, the 9120 grade may require thicker sections or additional validation for high-elongation snap-fit applications. These differences are formulation-specific and must be confirmed against current supplier datasheets rather than inferred from product family naming.
In medium-volume prototyping cells, Somos 9120 can serve as a reference material for build parameter qualification. A production line that qualifies a build platform with this resin establishes baseline recoating, laser calibration, and post-cure records that are transferable to other unfilled epoxy stereolithography resins only after revalidation of viscosity, cure depth, and green strength. The build chamber environment, cleaning solvents, and post-cure station should be controlled as part of the same validation workflow, because variation in any downstream operation can introduce dimensional error greater than the resin’s own batch tolerance.
