| HS Code | 293398 |
| Tensilestrength | 64 MPa |
| Tensilemodulus | 2850 MPa |
| Elongationatbreak | 4.2% |
| Flexuralstrength | 110 MPa |
| Flexuralmodulus | 3000 MPa |
| Hardness | 86 Shore D |
| Impactstrength | 25 J/m |
| Heatdeflectiontemperature | 120 °C at 0.45 MPa |
| Glasstransitiontemperature | 140 °C |
| Density | 1.15 g/cm³ |
| Waterabsorption | 0.3% |
| Dielectricconstant | 3.5 at 1 MHz |
| Dielectricstrength | 15 kV/mm |
| Viscosity | 350 cP at 30 °C |
| Criticalexposure | 10 mJ/cm² |
| Penetrationdepth | 0.15 mm |
| Coefficientofthermalexpansion | 60 µm/m/°C |
| Thermalconductivity | 0.2 W/m·K |
As an accredited DSM Somos 7110 Epoxy Photopolymer, UV & Thermal Postcure factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 1 kg opaque plastic bottles with screw caps, labeled DSM Somos 7110 Epoxy Photopolymer for UV/thermal postcure. |
| Container Loading (20′ FCL) | 20′ FCL container loading: palletized DSM Somos 7110 Epoxy Photopolymer, UV & Thermal Postcure, secured, labeled, and documented for safe transport. |
| Shipping | DSM Somos 7110 Epoxy Photopolymer, UV & Thermal Postcure is typically shipped as a non-regulated liquid resin in sealed, opaque, leak-proof containers. Protect from UV light, heat, ignition sources, and freezing. Transport upright at moderate temperatures. Confirm current DOT/IATA/IMDG classification and follow the SDS before shipment. |
| Storage | Store DSM Somos 7110 Epoxy Photopolymer in a tightly closed original container in a cool, dry, well-ventilated area away from direct sunlight, UV light, heat, sparks, and flames. Maintain recommended temperature, avoid freezing, and keep separate from oxidizers and incompatible chemicals. Use secondary containment, keep containers labeled, follow SDS and local regulations. Protect from moisture, contamination, and unauthorized access. |
| Shelf Life | Shelf life is 12 months when stored in the original, unopened container at 18–25°C. |
When Somos 7110 is used as a master pattern for room-temperature vulcanising silicone tooling in investment casting shops, the primary conflict is residual surface reactivity and moisture absorption after the standard stereolithography build. The pattern is typically built at 100 µm layer thickness, rinsed with isopropanol, and dried under filtered air at 23 °C and 45 % RH for 24 h. Postcure is executed in two stages: ultraviolet exposure at 365–405 nm for 60 min, followed by thermal cure at 80 °C for 120 min. The thermal plateau is not simply a conversion step; it drives unreacted oxirane groups toward the glass transition and reduces extractable components that would otherwise interfere with platinum-catalyst silicone systems or produce variable interface cure in condensation-cure RTV compounds. After postcure the pattern is sanded to Ra 0.8 µm according to ISO 4287 and sealed with a solvent-based acrylic barrier coat. Without this sealcoat, wax injection pressures of 0.7 MPa can force liquid wax into microporosity left by sanding, causing flash on the final wax pattern. The silicone mould is mixed at 10:1 base:curing agent by weight, degassed at 50 mbar for 5 min, poured around the sealed master, and cured at 23 °C for 24 h. The resulting negative mould is cut along engraved parting lines, and a filled investment casting wax is injected at 60 °C and 0.7 MPa. Terminal wax patterns are inspected to ISO 8062-3 CT6 before ceramic shelling for stainless steel impeller castings.
In vacuum casting of polyurethane service prototypes, the Somos 7110 master is not used as a functional part but as a positive pattern inside a silicone mould. A two-part polyurethane casting resin with a 100:80 part A:part B weight ratio and a mixed viscosity of 1 500 mPa·s at 25 °C is prepared after the master has been conditioned at 23 °C and 40 % RH for 48 h to stabilise moisture content. The silicone tooling is preheated to 40 °C, and the resin is poured under vacuum at −0.95 bar; the exotherm typically raises the material interface to 70–80 °C for 8–12 min, which is close to the postcured heat deflection temperature of the epoxy master. This condition limits repeated production cycles because local softening of the master surface can occur if the exotherm is not interrupted by an aluminium cooling plate on the backside of the mould. The process is therefore restricted to formulations with a gel time above 6 min and a peak exotherm below 85 °C. No independent published material property table for this exact configuration exists; production validation relies on trial mouldings measured against ISO 527-2:2012 tensile test bars. Terminal parts include Shore 70 A polyurethane gaskets and flexible isolator covers used in electrical enclosure sealing trials.
Low-volume thermoforming of 1.0 mm polystyrene and high-impact polystyrene sheet places the Somos 7110 insert in direct cyclical contact with a heated sheet at 110–120 °C. The tool insert is grown as a shell with a wall thickness of 12 mm and a closed-cell internal lattice at 20 % volume fraction to reduce thermal mass. During vacuum forming, the sheet is clamped and heated until surface temperature reaches 110 °C, then drawn onto the stereolithography insert with a vacuum of −0.85 bar. The key operational boundary is the epoxy insert's deflection temperature under 0.46 MPa in the 46–66 °C range after standard postcure, which is below the sheet surface temperature; therefore contact is allowable only for 10–15 s per cycle, and the insert must be actively cooled with compressed air at 2 bar between pulls. Hole drilling for vacuum ports is performed at 0.8 mm diameter using titanium-coated drills at 2 000 rpm, because the epoxy matrix produces micro-chipping at exit edges if unbacked. The insert is checked for dimensional drift after every 100 cycles using a coordinate measuring machine referenced to ISO 10360-2. Terminal products are ABS electronics trays and polystyrene blister inserts for consumer packaging, where the process window is dictated by the thermal creep limit of the insert rather than the forming behaviour of the sheet.
Short-run injection moulding of polypropylene living-hinge caps and enclosure clips using an epoxy photopolymer insert is governed by the low thermal conductivity of the printed tool compared with machined aluminium. The insert is manufactured with a 50 µm layer thickness, then postcured at 60 min ultraviolet exposure and 120 min at 80 °C. A steel backing plate is bonded to the insert with a two-part methacrylate adhesive at a film thickness of 0.25 mm. The process window on a 350 kN clamp force machine is limited to a maximum cavity pressure of 80 bar and a melt temperature of 210 °C for unfilled polypropylene with a melt mass-flow rate of 12 g/10 min under 2.16 kg at 230 °C per ISO 1133-1:2022. Because the epoxy tool surface degrades above 120 °C when contact time exceeds 30 s, the configuration cannot be used for glass-filled grades or for materials requiring mould temperatures above 80 °C. Ejection is restricted to flat ejector pins with a diameter of 6 mm and no more than 0.05 mm interference to avoid edge fracture. Comparative values for aluminium 7075-T6 and fully postcured Somos 7110 are summarised below.
| Property | Aluminium 7075-T6 | Somos 7110 fully postcured | Source / condition |
|---|---|---|---|
| Thermal conductivity | 130–160 W/m·K | 0.20–0.30 W/m·K | Material class data; verify batch certificate |
| Coefficient of linear thermal expansion | 23 µm/m/°C | 70–90 µm/m/°C | 20–80 °C interval |
| Deflection temperature at 0.46 MPa | Not applicable | 46–66 °C | ASTM D648-18 after postcure |
| Maximum cavity pressure | 200 bar typical | 80 bar limit | Observed on 350 kN injection machine |
| Mould temperature | 60–80 °C | 40–60 °C recommended | Lower limit to reduce creep |
| Cycle time multiplier | 1.0 | 3–5 | Cooling time driven by thermal conductivity |
A first-article inspection gauge for a turbine blade root profile can be manufactured from Somos 7110 when the inspection environment is temperature-controlled and the probe contact force is limited. The gauge body is grown at 50 µm layer slices, postcured with 60 min ultraviolet exposure at 365 nm and 120 min at 80 °C, then aged for 48 h at 23 °C before hard probing. The epoxy gauge is not a direct substitute for a steel gauge under ISO 14253-1 verification because thermal expansion and probe indentation introduce measurement uncertainty. However, for first-article validation of blade root geometry under a coordinate measuring machine with a contact force of 0.1 N, the printed gauge provides a stable reference surface with dimensional drift below 0.05 mm over a 200-hour measurement campaign. The critical design parameter is the internal lattice fill, set at 15 % volume fraction to balance stiffness and moisture absorption. Measurement uncertainty is calculated according to ISO 10360-2, and the gauge is periodically re-qualified against a calibrated steel master. Published data for this specific configuration is limited; the residual anisotropy from the 50 µm slice direction must be characterised by the user before accepting the gauge for production release.
Underhood electrical connector shell prototypes are printed when laboratory validation of contact retention and sealing interface dimensions must occur before steel tooling is released. The Somos 7110 shell is built at 100 µm layer thickness, postcured at 80 °C for 120 min, and drilled for brass thread inserts using an engagement ratio of 2.5×D. The resin is unfilled, so the final part exhibits batch-dependent dielectric behaviour rather than a single fixed datasheet value; the compliance matrix below lists the test methods applied to 1.0 mm or 6.4 mm specimens depending on the property. Thermal cycling from −40 °C to 85 °C is performed on assembled prototypes for 500 h, and the sealing interface flatness is measured before and after cycling according to ISO 4287. The operational boundary is continuous exposure above 85 °C, where localised creep at the thread insert under repeated connector mating can reduce retention force. Terminal parts are engine harness connector shell prototypes used for durability trials with mated contact force monitoring.
| Property | Method | Condition / specimen | Required output |
|---|---|---|---|
| Tensile strength | ASTM D638-14 | Type I, 23 °C, 5 mm/min | Report batch value |
| Flexural modulus | ISO 178:2019 | 23 °C, span-to-thickness 16:1 | Report batch value |
| Heat deflection temperature | ASTM D648-18 | 0.46 MPa, 6.4 mm specimen | Report after postcure |
| Dielectric strength | ASTM D149 | 1.0 mm sheet, oil immersion | Report |
| Flammability | UL 94 | Actual part thickness | Verify candidate class; batch-specific |
| RoHS restricted substances | IEC 62321 series | Homogeneous material | Pass 2011/65/EU Annex II |
| REACH SVHC | Regulation (EC) No 1907/2006 | Article 33 disclosure | Declaration from resin supplier |
Compressor blade cascade models for low-speed aerodynamic testing are fabricated from Somos 7110 at 50 µm layer thickness to reduce visible stair-stepping on leading edges, then postcured with 60 min ultraviolet exposure and 120 min at 80 °C. The internal volume is grown as a sealed lattice at 25 % volume fraction to reduce model mass, but each closed cell must be vented with a 0.5 mm drilled hole because pressure changes in the wind tunnel can otherwise cause surface dimpling. After curing, the surface is sealed with a polyurethane primer, sanded, and inspected to Ra 0.4 µm under ISO 4287 across the suction surface. Metal threaded inserts are bonded into the mounting face for sting attachment, and pressure taps are bonded with cyanoacrylate at 0.8 mm inner diameter. The operational boundary is tunnel air temperature above 60 °C, where the postcured epoxy matrix creeps under aerodynamic load; published data for this specific configuration is limited, so the model is qualified by repeated dimensional inspection between tunnel runs. Terminal parts are compressor cascade blades and aero-derivative guide vane models used to map separation lines at low Mach numbers.
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The liquid resin designated DSM Somos 7110 Epoxy Photopolymer, UV & Thermal Postcure is an epoxy-based photopolymer formulated for vat photopolymerization platforms operating at a laser wavelength of 355 nm. The product is supplied as an unfilled liquid with a density of approximately 1.12 g/cm³ at 25 °C and a reported viscosity near 250–330 cps at 30 °C. The standard processing path involves layered photopolymerization followed by a two-stage postcure: ultraviolet flood exposure for green-state hardening and controlled thermal aging to raise heat deflection temperature and stabilize the epoxy network. Because the resin cures by cationic ring-opening polymerization rather than free-radical acrylate propagation, the as-built part retains latent reactive species that respond to thermal postcure. This dual-cure behavior differentiates Somos 7110 from single-stage acrylate resins that require only UV exposure and from fully thermal epoxy systems that cannot be shaped by stereolithography.
Mechanical property data generated under ASTM D638 and ASTM D790 show that UV-only postcure produces a partly cured network with measurable stiffness and strength, but the heat deflection temperature remains below the values required for many secondary tooling processes. Manufacturer-published values for UV-only postcure list tensile strength in the 40–45 MPa range and elongation at break between 8% and 12%. After the combined UV and thermal postcure, tensile strength typically increases to 45–50 MPa, and elongation at break moves to approximately 11–15%. The most pronounced shift occurs in heat deflection temperature under 0.46 MPa, which rises from roughly 46 °C after UV-only exposure to approximately 65 °C after thermal aging. Flexural modulus, measured with ASTM D790, remains in the 2000–2500 MPa band, indicating that thermal postcure does not fundamentally reorder the polymer backbone but increases crosslink density and relaxes local stress concentrations.
| Property | Method | UV-only postcure | UV + thermal postcure |
|---|---|---|---|
| Tensile strength | ASTM D638 | 40–45 MPa | 45–50 MPa |
| Tensile elongation | ASTM D638 | 8–12% | 11–15% |
| Flexural modulus | ASTM D790 | 2000–2200 MPa | 2200–2500 MPa |
| HDT at 0.46 MPa | ASTM D648 | 46 °C | 65 °C |
| Shore D hardness | ASTM D2240 | 84–86 | 85–87 |
On production stereolithography platforms equipped with 355 nm solid-state lasers and tuned for 100–150 µm layer thickness, the resin is typically held at a vat temperature near 30 °C to maintain consistent recoating behavior. High-humidity environments above 60% RH can alter the cure response of the epoxy formulation; production lines therefore use desiccant dryers or conditioned build chambers when ambient moisture exceeds this threshold. Recoat blade speed and wait time are set to avoid bubbles in the high-viscosity regions surrounding vertical walls, and the laser exposure is adjusted by measuring the cured line width on a standardized test grid. Because the cationic cure continues after the laser pass, dark cure contributes to part stiffness within minutes after the build, but it is not sufficient to replace the separate UV and thermal steps. Builds with trapped resin pockets or closed hollow sections require drain holes of at least 3–5 mm diameter to prevent hydrostatic pressure or residual uncured resin release during postcure. Postcure chambers should maintain uniform UV irradiance of at least 5–10 mW/cm² across all surfaces, and thermal ovens should be ramped at 0.5–1.0 °C/min to avoid thermal shock in thick cross-sections.
Dimensional stability after full postcure is characterized by linear shrinkage measurements on standardized test bars and by coordinate scanning of benchmark parts. Manufacturer documentation reports volumetric shrinkage low enough for master pattern work, but the practical tolerance envelope depends on part geometry, layer thickness, and postcure fixture support. On an unfilled epoxy system of this class, linear shrinkage of fully postcured bars is typically below 0.3%; however, printed thin walls and unsupported overhangs can distort before postcure if the as-built green strength is insufficient for handling. The resin is therefore used where the required pattern tolerance is ±0.1 mm to ±0.2 mm for parts under 150 mm, with wider tolerances expected for larger tools or asymmetric mass distribution. The unfilled formulation produces a translucent amber part with visible layer lines after sanding; secondary finishing by abrasive blasting or primer filling is standard before mold rubber or ceramic shell work.
In investment casting foundries, the material is used selectively as a master pattern for silicone tooling rather than as a first-choice direct burnout resin, because the epoxy composition requires staged burnout schedules and the published ash content for direct burnout is limited. When direct burnout is attempted, the schedule requires staged heating to 600–700 °C with air flow to oxidize carbon residues before metal pour. Foundries using this resin report that a slow ramp through 300–500 °C is critical because rapid volatilization generates internal pressure that can crack the ceramic shell. The resin is more commonly used as a master pattern material for room-temperature vulcanizing silicone molds; in this application the highest service temperature is determined by the HDT and the exotherm of the curing silicone. If the silicone cure temperature exceeds 65 °C, postcured Somos 7110 can soften sufficiently to distort under clamping pressure, so mold boxes are maintained below the HDT or the tools are postcured at higher temperature for longer time to maximize crosslink density.
The distinction between UV-only and UV-plus-thermal processing is not merely a laboratory curiosity. A production part that receives only UV flood exposure retains a heat deflection temperature under 0.46 MPa near 46 °C. Moldmaking operations that involve heated release agents, silicone vulcanization at 70–80 °C, or low-pressure thermoplastic molding at 80–100 °C can therefore induce surface deformation, edge rounding, and loss of critical dimensional features. For elevated-temperature service, the thermal postcure step is mandatory. Manufacturer guidance describes thermal aging in the 60–80 °C range, with dwell time extended to 2–4 h for sections thicker than 10 mm. While this raises HDT, it does not convert the material into a high-temperature polymer. Continuous exposure above 80 °C remains outside the recommended operating envelope for load-bearing tools, and published data for long-term creep performance above this temperature is limited.
Comparative selection against other photopolymer grades focuses on the trade-off between rigidity and impact resistance. Water-resistant epoxy resins such as DSM Somos WaterShed XC 11122 provide lower moisture absorption and are used where clarity and low water uptake are required, but they can exhibit lower heat deflection temperature after standard postcure. General-purpose acrylate photopolymers typically build faster and are more easily post-processed by UV alone, but they show higher linear shrinkage and are more sensitive to oxygen inhibition at the build surface. The cationic epoxy mechanism in Somos 7110 reduces oxygen inhibition during laser exposure, which supports more consistent cure near the vat surface but also requires careful control of residual dark cure.
| Resin class | Tensile strength | Elongation at break | HDT at 0.46 MPa | Water absorption |
|---|---|---|---|---|
| DSM Somos 7110 epoxy photopolymer | 45–50 MPa | 11–15% | 65 °C | 0.5–0.7% |
| Water-resistant epoxy photopolymer | 50–55 MPa | 15–20% | 50–55 °C | 0.25–0.35% |
| General-purpose acrylate photopolymer | 40–50 MPa | 8–15% | 45–55 °C | 0.7–1.0% |
The cured epoxy network resists water and many aqueous cleaning solutions but is negatively affected by chlorinated solvents, strong ketones, and high-pH strippers. Immersion in methylene chloride or acetone causes swelling, surface crazing, and loss of dimensional stability within minutes to hours. Cleaning of green parts should therefore use isopropyl alcohol or proprietary resin wash formulations, and solvent contact time should be limited to 5–10 min with agitation. After postcure, the material retains moisture uptake near 0.5% under ASTM D570, which is acceptable for temporary tooling but not for continuous water immersion. For applications requiring repeated steam autoclave exposure, the resin is not recommended unless a sealed surface coat is applied. The resin is also incompatible with amine-based epoxy hardeners applied as coatings before full postcure because the amine accelerates crosslinking at the surface and produces brittle skin layers.
In production environments, lot-to-lot monitoring has identified viscosity drift as the most common batch-level variable. When incoming lots are not rechecked against the machine calibration curve, the laser penetration depth and recoating thickness can shift enough to change part dimensions by 0.05–0.10 mm on long builds. Manufacturers and service bureaus therefore maintain incoming viscosity acceptance windows of 250–350 cps at 30 °C and adjust build parameters after each lot change. Shake-based remixing before pouring is required because the epoxy components can stratify after prolonged storage. Shelf life is specified by the supplier as 12–24 months in unopened containers under dry, dark storage conditions; containers that have exceeded the recommended storage temperature or absorbed moisture may show longer dark cure and higher residual tack. These batch-control measures are more critical for Somos 7110 than for free-radical acrylate resins because the cationic cure is more sensitive to nucleophilic contaminants and water.
Material handling documentation classifies the uncured resin as a skin and eye irritant requiring chemically resistant gloves, safety glasses, and local exhaust ventilation around the vat. The cured polymer is not marketed as a food-contact or medical-grade material, and no FDA 21 CFR 177 clearance is implied by standard supplier documentation. EU operations should verify REACH registration and RoHS compliance for the specific lot because pigment-free formulations of this class do not generally contain the heavy metals restricted under RoHS Directive 2011/65/EU, but importers must confirm. The product is intended for industrial use, not for consumer handling, and uncured resin should be disposed through licensed hazardous-waste channels after the working life of the vat is exceeded.
