DSM Somos ProtoTherm™ 12120 Water-resistant resin for stereolithography, UV Postcure
- Название продукта: DSM Somos ProtoTherm™ 12120 Water-resistant resin for stereolithography, UV Postcure
- Сайт Factroy: Округ Юду, Ганьчжоу, Цзянси, Китай
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- Производитель: Ascent Petrochem Holdings Co., Limited
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- DSM Somos ProtoTherm™ 12120 Water-resistant resin for stereolithography, UV Postcure is typically used in formulations when viscosity and UV cure response and postcure temperature and humidity must be controlled within specific ranges.
| Код ТН ВЭД | 770634 |
Как аккредитованная DSM Somos ProtoTherm™ 12120 водоустойчивая смола для стереолитографии, UV Postcure завод, мы соблюдаем строгие протоколы качества - каждая партия подвергается строгим испытаниям для обеспечения последовательных стандартов эффективности и безопасности.
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In engine coolant-system validation, Somos ProtoTherm 12120 is charged as a 100 %-solids photopolymer vat feedstock with no reactive diluent; vat replenishment on 600 mm-class stereolithography platforms is required at 7–12 wt% of the initial fill after each build because carry-out on thin-wall coolant parts removes resin from the process volume. The resin is scanned on 355 nm galvanometric systems with 100 μm layer thickness, 0.10 mm hatch spacing, and double border passes; vat temperature is held at 28–32 °C, and recoat delay is extended 1.2–1.5× relative to machine-default settings to eliminate gas entrapment at the leading edge of flat flanges. Downstream processing for coolant crossover prototypes begins with a two-stage isopropyl alcohol wash at ≥98 % purity, 5 min per stage under 40 kHz ultrasonic agitation, followed by compressed-air drying at 0.4–0.6 MPa. UV postcure is executed in a nitrogen-purged chamber with 320–390 nm UVA, 12–20 J/cm² total dosage, and chamber temperature at 60 °C for 60–90 min. Postcured components are machined with carbide reamers at 6,000–10,000 rpm to achieve valve-seat roundness below 0.05 mm, then assembled with EPDM gaskets. Thermal-cycle compliance follows ISO 16750-4:2023 with 100 cycles from −40 °C to 80 °C in 50/50 water-glycol; deflection temperature is reported under ASTM D648-18 at 0.46 MPa, and humidity exposure is evaluated according to ISO 6270-1:2017. The terminal product set includes coolant crossover pipes, thermostat housing prototypes, water pump outlet flanges, and deaeration tank caps for short-run engine test rigs. A process boundary exists with methyl ethyl ketone and chlorinated solvent wipe-down; these solvents induce surface swelling and should be replaced with isopropanol-based degreasing. Ambient relative humidity above 60 % requires a 15–30 min dry-air hold before postcure to prevent surface tack from residual water film.
What Limits Submersible Connector Housing Durability in 60 °C Freshwater?
The primary failure mode observed on production-scale submersible connector lines is root-cracking at M20×1.5 cable gland threads after postcure doses above 30 J/cm²; the over-crosslinked surface layer develops residual tensile stress that propagates under insert press-fit. For this application, ProtoTherm 12120 is charged at a volumetric fill ratio of 0.75–0.85 of maximum vat capacity to allow bubble release; no conductive filler is added, which maintains surface resistivity but excludes far-field EMI shielding. The scan strategy uses 50 μm layer thickness at the thread region and 100 μm elsewhere, with 0.08 mm laser beam diameter and 0.10 mm hatch spacing. Downstream processing consists of tripropylene glycol monomethyl ether immersion at 25–30 °C for 6–8 min, followed by a deionized water rinse at 50 °C and nitrogen-purged UV postcure at 8–15 mW/cm² UVA and 20–30 J/cm² total dose. Metal contact inserts are press-fit with 0.03–0.08 mm radial interference after postcure; this value is intentionally set below 0.10 mm to avoid tensile hoop stress at the gland root. Ingress protection is validated under IEC 60529:2013 IP67 and IP68 conditions, including 1 m submersion for 30 min and an equivalent hydrostatic exposure at 0.2 MPa. Polymeric enclosure suitability is also assessed against UL 746C for wet location and outdoor UV exposure; component-level certification is part-number-specific. Terminal products include underwater sensor bodies, cable gland shells, battery housing fronts, and wet-environment limit switch enclosures. Amine-based potting compounds should be screened by an adhesion primer because the photopolymer surface may exhibit reduced bond strength after nitrogen postcure unless plasma-treated at 100–200 W for 60 s.
Where a filtration manifold requires sealing faces that remain dimensionally stable in chlorine-bearing process water, the resin is used without post-additive blending; vat charge maintenance follows a 1:1 mass replenishment of fresh resin after each 24 h continuous printing shift because repeated scanning at 355 nm can raise vat viscosity beyond the nominal 2,500 mPa·s value listed for 30 °C, though published drift data for this specific build configuration is limited. The build recipe for water-treatment manifold segments specifies 100 μm layer thickness, 0.12 mm hatch spacing, and a 0.8 s post-scan wait before recoat; this produces a green-state edge definition of ±0.15 mm on DN50 flange faces. After stereolithography, parts are washed in dipropylene glycol methyl ether at 25 °C with 40 kHz ultrasonic agitation for 5 min, then rinsed in deionized water at 50 °C for 10 min. Postcure is performed at 25 J/cm² UVA with a 60 °C chamber temperature; chamber relative humidity is maintained below 60 % to prevent surface tack. Postcured manifolds are pressure-tested at 0.8 MPa with 2–5 % sodium hypochlorite solution for 100 h, and dimensional inspection is recorded on threaded bosses. Compliance for potable-water contact is not automatically conferred by the resin datasheet; independent extraction testing under NSF/ANSI/CAN 61 is mandatory for final component certification. Mechanical acceptance uses ISO 178:2019 flexural testing and ASTM D638-14 tensile testing after immersion. Terminal products are multi-cartridge filter heads, reverse-osmosis membrane housing prototypes, DN50 flanged valve bodies, and flow-splitting manifolds for industrial water-treatment skids. Long-term chlorine exposure data for this specific configuration is limited; coupon-level aging is required before deployment beyond 100 h.
Across the above application fields, the following standard designations define the acceptance framework.
| Application field | Standard designation | Measured parameter | Acceptance or use condition |
|---|---|---|---|
| Automotive coolant components | ISO 16750-4:2023 | Thermal and fluid cycling | 100 cycles at −40 °C to 80 °C in 50/50 water-glycol |
| Submersible connector housings | IEC 60529:2013 | IP67/IP68 ingress | 1 m submersion 30 min; 0.2 MPa equivalent hydrostatic exposure |
| Water-treatment manifolds | NSF/ANSI/CAN 61 | Extraction for potable contact | Independent certification required; resin datasheet alone is not sufficient |
| CIP sanitary manifolds | EHEDG Doc 8, DIN 11864-2 | Hygienic design and aseptic flange geometry | Surface roughness Ra ≤ 0.8 µm after finishing |
| Pump volute prototypes | ASTM D638-14, ASTM D790-17, ISO 62:2008 | Dry and water-conditioned mechanicals | No crack after 200,000 cycles at 1.2 MPa water-glycol |
| Marine enclosure prototypes | ASTM D570-22, ISO 1183-1:2019 | Water absorption and density | 24 h immersion at 20 m equivalent freshwater pressure |
CIP Sanitary Manifold Prototyping Without Autoclave Warp
Sanitary manifold prototyping for clean-in-place systems uses the resin’s water resistance after full postcure, but the material is not a substitute for FDA 21 CFR 177.2600-compliant rubber or molded thermoplastics in direct food-contact service. For this scenario, the vat charge is 100 % ProtoTherm 12120; layer thickness is segmented at 50 μm for internal channel walls and 100 μm for flanges without changing the resin formulation. Downstream processing begins with a 99 % isopropyl alcohol first-stage wash at 20–25 °C for 8 min, a second-stage wash for 4 min, and forced-air drying at 0.5 MPa. UV postcure uses 350 nm lamps at 15 mW/cm² for 30 min; parts are rotated to expose both flange faces and internal CIP channels to the light field. The postcured manifold is not autoclaved above 100 °C; cleaning validation is run at 80 °C with alternating cycles of 1–2 % sodium hydroxide and 0.5–1 % nitric acid for 50 cycles. Surface roughness after mechanical polishing is controlled to Ra 0.8 µm or lower on product-contact surfaces, as required by EHEDG Doc 8. Aseptic flange geometry is checked against DIN 11864-2, and water absorption is determined under ASTM D570-22. Terminal products include CIP spray ball housings, aseptic flange prototypes, plate heat exchanger distribution boxes, and flow diversion valve bodies. Direct food-contact use requires a separate polymer migration study; the resin producer does not provide a global food-contact clearance for stereolithography photopolymers.
When a Pump Volute Must Survive a 1.2 MPa Water-Glycol Pressure Pulsation Test
In high-pressure pump volute testing, fatigue-crack initiation is concentrated at the tongue cutwater, where CAD-derived stress concentration coincides with the highest residual stress from stereolithography build-peel forces. The resin is processed at a vat charge ratio of 0.80 of maximum fill; the processing temperature window is 28–32 °C. Below 28 °C, vat viscosity enters a region above 3,500 mPa·s and produces incomplete recoat on inclined volute walls; above 32 °C, thermal drift in the laser galvanometer can shift border-vector alignment at the cutwater by more than 0.05 mm. The scan strategy uses 100 μm layer thickness, 0.06 mm border passes, and 0.15 mm internal hatch spacing to limit edge curl; wall thickness below 2.5 mm is supported by triangular web scaffolding that is removed before solvent washing.
After building, the volute is washed in ≥99 % tripropylene glycol monomethyl ether at 28 °C for 10 min, air-dried at 23 °C and 55 % RH for 60 min, and postcured in a rotary UV chamber at 30 J/cm² UVA and 20 mW/cm² peak irradiance; surface temperature is held below 80 °C to avoid differential shrinkage at the cutwater. The diffuser flange is lapped to 0.03 mm flatness over 150 mm and assembled with an EPDM gasket. Pressure pulsation testing at 1.2 MPa, 60 °C water-glycol, 2 Hz, and 200,000 cycles is used for part release; the test is derived from the pump manufacturer’s PV specification rather than a single ISO impulse standard. Material-level acceptance references ASTM D638-14, ASTM D790-17, and ISO 62:2008. Because wet-condition flexural modulus retention at elevated water-glycol temperatures is design-critical, published data for this specific configuration is limited; a derating of 15–20 % from dry flexural modulus is applied unless lot-specific coupon testing demonstrates otherwise. Terminal products include centrifugal pump volutes, turbine pump housings, flow cones, and strainer bodies.
Prior to service in shallow-water marine camera enclosures, print orientation is evaluated on production-scale stereolithography machines to prevent resin pooling in blind threaded inserts. ProtoTherm 12120 is used undiluted at 100 % solids; for wall sections above 6 mm, the build platform is inclined 20° to reduce suction-induced delamination during recoating. Layer thickness is 100 μm, vat temperature is maintained at 30 °C with a water-jacketed vat, and hatch spacing is 0.10 mm. Following printing, parts are washed in 99 % tripropylene glycol monomethyl ether at 30 °C for 8 min, then in 70 % isopropyl alcohol for 3 min to remove solvent residue, followed by 0.5 MPa forced-air drying. UV postcure is performed at 20 J/cm² UVA for 90 min; a 24 h dark stabilization at 23 °C is required before dimensional inspection because postcure shrinkage stabilizes during this interval. Threaded penetrator holes are machined with a 2.5 mm carbide end mill at 12,000 rpm, and O-ring grooves are sized for 2.5 mm cross-section nitrile or FKM seals. Depth rating is validated at 20 m equivalent freshwater hydrostatic pressure for 24 h immersion, while water absorption is measured under ASTM D570-22, tensile retention after immersion under ASTM D638-14, and density under ISO 1183-1:2019. Terminal products include ROV camera housings, LED light canisters, subsea connector boot protectors, and towed side-scan sonar fairings. Published long-term marine immersion data beyond 24 h for this specific resin is limited; a coupon qualification ladder is required before service beyond 20 m or 30 days continuous immersion.
Конкурентоспособная DSM Somos ProtoTherm™ 12120 Водонепроницаемая смола для стереолитографии, цены UV Postcure, которые соответствуют вашему бюджету - гибкие условия и индивидуальные котировки для каждого заказа.
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- DSM Somos ProtoTherm™ 12120 Water-resistant resin for stereolithography, UV Postcure Производится в соответствии с системой качества ISO 9001 и отвечает соответствующим нормативным требованиям.
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DSM Somos ProtoTherm™ 12120 Water-resistant resin for stereolithography, UV Postcure
DSM Somos ProtoTherm™ 12120 is a water-resistant liquid photopolymer resin for laser-based vat stereolithography, supplied as a single-component photoreactive formulation for processing at ultraviolet laser wavelengths. The resin is used where functional stereolithography parts must tolerate humid air, intermittent water contact, or short-duration aqueous immersion while retaining dimensional and mechanical stability. The commercial designation places the material in the high-heat-deflection segment of the manufacturer’s stereolithography resin platform rather than in the high-elongation or general-purpose segment. It is not a sealant grade, and continuous exposure to pressurised hot water above the wet thermal service range requires application-specific qualification.
The product name carries two explicit process conditions: stereolithography and UV postcure. Stereolithography refers to layerwise photopolymerisation in a vat, using a frequency-tripled solid-state laser or equivalent source at 355 nm. UV postcure is required after part cleaning because as-built conversion of the reactive groups is not complete. Green parts retain residual unsaturation and epoxide functionality; without a controlled postcure step, the published tensile modulus, heat deflection temperature, and water absorption behaviour are not achieved. The resin therefore occupies a processing window in which green-state handling, solvent removal, and final radiant exposure collectively control the delivered property envelope.
The commercial resin is supplied in light-blocking containers and should be conditioned to the machine temperature before use. Viscosity at 30 °C is sufficiently low for recoat operations on standard stereolithography platforms. If the room relative humidity exceeds 60 %, the vat surface can pick up atmospheric moisture over extended idle periods. The recommended mitigation is active dehumidification of the build chamber or nitrogen blanketing, because water in the vat can reduce interlayer adhesion and shift the green-state modulus.
What Limits the Use of Standard Stereolithography Resins in Moisture-Exposed Functional Testing?
Standard stereolithography photopolymers typically exhibit measurable moisture uptake when exposed to humid air or water, producing dimensional swelling, edge softening, and loss of heat deflection under load. In vehicle fluid-handling prototypes and pump test fixtures, this behaviour can obscure the performance of the design being evaluated because the plastic component, rather than the intended metal or composite production material, becomes the source of leakage or dimensional shift. ProtoTherm 12120 is formulated to reduce that uptake. Manufacturer-published water absorption values for the postcured material fall below 0.6 mass% after 24 h immersion at 23 °C when tested under ASTM D570-98(2018) or ISO 62:2008 protocols, depending on part thickness and postcure uniformity. The corresponding dimensional change is lower than that of general-purpose stereolithography grades; however, the resin is not hydrophobic and should not be treated as an immersion membrane.
In water-pump housing prototypes, the build orientation is chosen so that the sealing face is not supported by overhanging supports that generate rough surfaces. The material’s water resistance prevents the wicking of water along layer lines during the test, but layer lines are not eliminated. For sealing applications, the printed face is typically post-machined or coated with a thin sealant because stereolithography layer striations can provide capillary paths regardless of resin hydrophobicity. This limitation is not unique to ProtoTherm 12120 and should be included in design reviews.
Postcure Requirements and Green-State Property Drift
Green-state parts removed from the vat contain solvent-wash residues and unreacted photoinitiator fragments. The postcure step is conventionally performed in a UV flood chamber equipped with UVA sources such as mercury arc lamps or LED arrays operating at 365 nm or 405 nm. Uniform irradiance across vertical walls and internal channels is a practical bottleneck; sections thicker than 10 mm may require staged exposure because light attenuation limits through-cure. Production schedules often specify a solvent pre-clean in isopropyl alcohol or a dedicated resin washer, followed by air drying to remove residual alcohol before UV exposure. If residual alcohol remains, surface crazing can appear during postcure, producing microcrack networks that invalidate water-resistance measurements. The manufacturer recommends verifying postcure effectiveness by measuring the 0.46 MPa heat deflection temperature or the tensile modulus; parts that fall below the lower end of the published range are returned to the postcure chamber.
The relationship between postcure and water resistance is not linear. Under-cured sections show higher equilibrium moisture uptake because residual polar functional groups and low crosslink density increase free volume. Overexposure in a thermal postcure can embrittle the network and raise notch sensitivity without additional improvement in water uptake. The practical processing window therefore treats postcure as a fixed cycle rather than a variable to be maximised. Lot-to-lot variation in photoinitiator content is small but sufficient to shift the optimum by several minutes on older lamp-based units.
The table below summarises representative postcured property ranges reported for DSM Somos ProtoTherm™ 12120 in manufacturer technical literature. Exact values are lot-, build-orientation-, and postcure-dependent.
| Property | Representative range | Test method |
|---|---|---|
| Hardness, Shore D | 80–85 | ISO 868:2003 |
| Density | 1.10–1.15 g/cm³ | ISO 1183-1:2019 |
| Tensile strength | 35–50 MPa | ASTM D638-14 / ISO 527-2:2012 |
| Tensile modulus | 2,000–2,600 MPa | ASTM D638-14 |
| Elongation at break | 5–10 % | ASTM D638-14 |
| Flexural strength | 60–75 MPa | ASTM D790-17 / ISO 178:2019 |
| Flexural modulus | 2,000–2,400 MPa | ASTM D790-17 |
| Heat deflection temperature at 0.46 MPa | 100–125 °C | ASTM D648-18 |
| Heat deflection temperature at 1.81 MPa | 50–65 °C | ASTM D648-18 |
| Notched Izod impact | 10–25 J/m | ASTM D256-10 |
| Water absorption, 24 h | 0.2–0.6 mass% | ASTM D570-98(2018) |
Application programmers typically select ProtoTherm 12120 for underhood fluid-system models, water-pump housings, manifold segments, and static sealing surfaces where test fluids include water/glycol mixtures at temperatures below 60 °C. In these applications, the material’s value is not high elongation but the retention of bolt-load and seal alignment under intermittent moisture, combined with a heat deflection temperature above the local temperature of an engine test cell. Parts built on 355 nm stereolithography systems with 100 µm or finer layer thickness are hand-finished in support regions and then postcured in UVA cabinets. Dimensional tolerance after postcure is not identical to the green-state build; vertical and horizontal surfaces may differ by several hundred micrometres because volumetric shrinkage during final conversion is anisotropic. This behaviour is consistent with layerwise polymer orientation and is accommodated by scaling factors in the build file rather than by mechanical compensation.
Evaluating the Influence of Postcure Irradiance on Moisture Uptake
Postcure irradiance is a more sensitive control variable than total exposure time because the resin undergoes both free-radical and cationic reactions. Low irradiance may generate radicals that terminate before the slower cationic network builds sufficient molecular weight, leaving a rubbery core. High irradiance at 405 nm can produce high surface conversion but insufficient penetration through thicker sections, creating a gradient in water absorption and glass transition. The result is a part that meets surface hardness but exhibits lower heat deflection in the core. For this reason, postcure fixtures intended for 20 mm wall thickness and above use multi-angle lamp arrays or rotating stages. Radiant exposure should be recorded at the part surface with a calibrated UVA radiometer; the use of an uncorrected timer alone is inadequate for critical water-resistant prototypes. Relevant measurement standards include ASTM D648-18 for thermal distortion and ASTM D570-98(2018) for water uptake, but the postcure condition itself is machine-specific.
A recurring field failure mode in production-scale stereolithography of this class of resin is under-cure near the build platform side when postcure light is incident only from one direction. Floor-side surfaces may show 0.2–0.4 % higher moisture uptake than the exposed top surface for thick blocks. The practical correction is to flip parts after the first postcure interval or to use a wire rack that permits light transmission through the bottom. Batch-to-batch variance in photoinitiator concentration is low, but calibration drift in UVA lamp arrays is a more frequent cause of rejected parts. Typical industrial maintenance intervals specify a radiometric output check at monthly intervals, with lamp replacement below 80 % of initial irradiance.
When the Design Load Involves Sustained Water Contact Under Flexural Stress
Water absorption values alone do not define performance when the part is subjected to sustained flexural load. Absorbed water acts as a plasticiser, lowering the glass transition onset and accelerating creep below the static heat deflection temperature. For ProtoTherm 12120, the 0.46 MPa heat deflection temperature is a short-term heat resistance parameter under dry conditions; it does not represent a creep-rupture limit in humid environments. Prototypes that will run for extended periods in circulating water should be evaluated under load at the intended service temperature. Published data for continuous immersion creep of this specific configuration is limited, so test fixtures frequently use reduced-section tensile bars or cantilever specimens in the actual water bath to validate the design before committing to full printed housings. Where cyclic water spray and thermal cycling are combined, an industrial practice is to add drain slots or pressure-relief openings in the printed part to prevent trapped-water damage during oven drying cycles.
The material imposes handling constraints that differ from general-purpose stereolithography resins. Supports are brittle; removal must occur before full UV postcure, when the green part is still sufficiently compliant. After full postcure, aggressive support removal can cause edge chipping because the network has reached its final crosslink density. Solvent cleaning should be limited to 10–20 min in an ultrasonic bath to avoid solvent-induced microcracking. Drying at 40–50 °C for at least 2 h is typical before postcure; parts with closed internal channels require longer because residual solvent can persist in thin cavities. These are operational boundaries, not defects; failure to observe them produces measurable reductions in water resistance and flexural modulus.
Moisture resistance changes the selection logic among stereolithography grades
Within the manufacturer’s stereolithography resin portfolio, ProtoTherm 12120 is differentiated from general-purpose resins by lower equilibrium moisture uptake and higher dry heat deflection temperature. It is differentiated from impact-modified stereolithography resins by lower notched Izod energy absorption and lower elongation at break. The dry tensile modulus range of 2,000–2,600 MPa is intermediate between rigid unfilled grades and higher-modulus ceramic-filled grades, but the water-resistance characteristic changes the selection logic for humid functional testing. A part built in a general-purpose stereolithography resin may pass a dry dimensional check but fail a water-flow test through edge swelling; the same geometry in ProtoTherm 12120 is more likely to retain its sealing face and bolt preload over the test interval. The trade-off is a narrower postcure window and reduced resistance to impact loading. The resin should not be selected for snap-fit prototypes or parts requiring high strain to failure, because elongation at break in the 5–10 % range is insufficient for many mechanical interlock designs.
Switching from standard grades frequently requires adjustment of support removal timing because the green-state hardness and final hardness after UV postcure are different. The material also has a lower wet modulus retention loss than non-water-resistant grades; in comparative tests under humid ageing, the retained flexural modulus after water exposure is higher, but published data for this specific configuration is limited. The resin is therefore specified for moisture-exposed functional testing where moderate elongation, thermal resistance, and dimensional stability are more important than impact toughness or rapid build turnover.
