In fine jewelry investment casting, ETEC Easy Cast 2.0 is consumed as a single-component photopolymer on 405 nm DLP equipment; because the resin contains no curative or reactive diluent, dilution with alcohol or monomer at any ratio is not part of the application. The treeing pattern mass is governed by the downstream gypsum-bonded investment ratio, which in a temperature-controlled shop at 21–23°C is proportioned at 38–40 mL distilled water per 100 g of investment powder for 14K and 18K yellow, rose, and palladium white gold alloys. Ring shanks, pavé setting bars, and filigree elements with wall thickness from 0.35 mm to 1.2 mm are printed at 25 µm or 50 µm layer thickness and oriented 10–15° from vertical to reduce layering artifacts in concave bezel channels. Supports are limited to contact tip diameters of 0.2 mm, and finished patterns are washed in two successive ≥99% isopropanol baths for 60–90 s each before being air-dried. A post-cure flood exposure at 405 nm and 10–20 mW/cm² for 5–10 min is applied to strengthen thin filigree; over-post-curing beyond 20 min is avoided because progressive crosslinking can raise the modulus, making support removal fracture-prone in re-entrant stone-setting geometry. Flasks are burned out in a vented kiln with a 2°C/min ramp to 300°C, 1 h hold, 3°C/min ramp to 750°C, and 2 h soak before cooling to the alloy-specific casting temperature of 550–620°C. The terminal articles—signet rings, hollow bangles, pendant bodies, and channel-set bands—are cast directly from the fired mold and then finished; where skin contact is direct and prolonged, final articles are tested for nickel release per EN 1811:2011+A1:2015 under REACH Annex XVII Entry 27, with a limit of 0.5 µg/cm²/week. Residual ash from the resin is assessed according to ASTM D2584-18 ignition-loss practices, and foundry lot verification is required when alloy specifications tighten the ash allowance below 0.1% by mass.

What Governs Pattern Burnout in Cobalt-Chromium Dental Frameworks?

In dental framework casting, the process window is set by the interaction between pattern decomposition and the phosphate-bonded investment’s peak mold temperature, not by the resin’s DLP print speed. ETEC Easy Cast 2.0 patterns for removable partial denture frameworks are printed with 50 µm layers and oriented so that the denture saddle and lingual bar do not create isolated blind pockets that retain uncured monomer during washing. The resin is used neat, without mixing; the first formulation-sensitive ratio appears only after printing, when a high-temperature phosphate-bonded refractory is mixed in the range of 100 g powder / 20–25 mL undiluted special liquid / 8–12 mL distilled water at 22–24°C, with the water fraction lowered toward the bottom of the range as ambient relative humidity exceeds 55%. Sprues are attached as 2–3 mm oval cylinders, and the pattern assembly is invested within a ring-free flask. The burnout cycle is staged as 2°C/min to 300°C, hold 45 min, 3°C/min to 750°C, hold 1 h, then 4°C/min to 900°C for the final soak required by the investment. This slow oxidative stage prevents carbon-bearing decomposition products from being trapped in narrow mold cavities before the 1450–1500°C induction casting of the Co-Cr alloy. Final cast frameworks are inspected against ISO 22674:2016 type 5 requirements for metallic framework materials, and if the framework will contact oral tissue, the device-level biological evaluation follows ISO 10993-1:2018 with in vitro cytotoxicity screening under ISO 10993-5:2009. The pattern resin is not a final medical device material; its function ends at the burnout stage, but residual ash carried into the mold can create carbon inclusions that are visible only after electrochemical finishing. Terminal products are one-piece cast partial denture frameworks, clasp-bearing assemblies, and dental bridge substructures for subsequent acrylic or ceramic veneering.

Platinum Alloy Hollowware and Filigree Patterns

The platinum 950 alloy casting line imposes a different thermal burden on the burnout pattern because the mold is held at 700–750°C before pouring, about 150–250°C higher than many gold casting shops. ETEC Easy Cast 2.0 is applied as a direct pattern for hollow platinum earrings, filigree pendants, and thin-wall band rings with minimum wall sections of 0.30 mm. Because platinum workpieces are commonly cast in larger flask volumes to accommodate higher metal mass, the pattern-to-investment ratio is constrained by flask geometry rather than resin chemistry; a 38 mL water / 100 g phosphate-bonded investment mix is retained, but the flask is ramped with a slower 1.5°C/min first-stage climb to 250°C to avoid thermal shock in filigree. The final soak is extended to 2 h at 850°C before the mold is cooled to 700–750°C for platinum alloy melting in a torch or induction casting cell. The resin used in this segment must deliver clean burnout at the top of the thermal profile; if residual ash remains at the mold surface, the high platinum alloy pouring temperature of 1770–1820°C can reduce surface gloss and create gas porosity at the metal-investment interface. Compliance for the finished Pt 950 articles is evaluated through fineness marking under ISO 9202 and, where applicable, through the same nickel release testing protocol under EN 1811:2011+A1:2015 because platinum alloys may contain less than 5% nickel but the skin-contact article still falls under the release framework. Operational boundaries include a prohibition on aqueous cleaning systems that leave residual water in blind filigree; only solvent-drying after isopropanol rinsing is used. The terminal output consists of heavyweight platinum bands and hollowware that would be slow or impractical to produce by hand wax carving, with the resin functioning solely as the disposable burnout pattern.

When a watch component manufacturer shifts from CNC-milled wax blanks to direct resin patterns for micro-fusion casting, the controlling variable is not tensile strength but dimensional repeatability across a densely packed pattern tree. ETEC Easy Cast 2.0 is used in this lane for case middle rings, bezel blanks, and deployant buckle cores with wall thickness down to 0.40 mm, printed at 25 µm layer height and arranged at 10–14% platform packing density to allow adequate isopropanol drainage from the sprue underside. The resin remains a one-part system; the only process ratio of note is the sprue cross-section to cast metal mass, typically maintained at 0.5 mm diameter per 0.1 g of cast metal for small components, plus an additional vent of 0.3 mm on the opposite side of the bezel shoulder. After printing, parts are washed in 99% isopropanol for 60 s and post-cured at 5–10 mW/cm² with 405 nm LEDs for 5 min; the cured pattern is then mounted on a resin sprue base and invested in a fine-particle ceramic slurry, not a standard plaster, for high-surface-detail micro-fusion. The burnout schedule starts at 1°C/min to 400°C, holds for 30 min, then increases at 2°C/min to 750°C and holds for 1 h before casting a nickel-free stainless steel or gold alloy at the foundry’s specified pour temperature. Finished watch case parts are audited for dimensional control with coordinate metrology and for skin-contact nickel release by EN 1811:2011+A1:2015 if the alloy system contains nickel. The terminal products are not final watches but cast blanks that proceed through machining, laser engraving, and polishing.

When Six-Axis Shell Coatings Must Hold a 316L Impeller Pattern

For short-run industrial investment casting, ETEC Easy Cast 2.0 patterns are used to produce small stainless steel impellers, pump brackets, and flow-control bodies in environments where a traditional wax injection die would not be economical. The pattern is printed at 50 µm layers, washed in two-stage isopropanol, and immediately transferred to a six-axis ceramic shell coating cell. The first coat uses a zircon-based slurry with a viscosity maintained at 20–25 s on a #4 Zahn cup; subsequent coats alternate between fused silica stucco sizes of 80–120 µm and 120–220 µm. Each coat is dried at 25–30°C and 40–60% RH for 30–60 min; the total shell thickness is built to 7–9 mm over the pattern. The photopolymer is not removed by steam autoclave but by direct burn-out in a flash furnace at 600–700°C for 20–30 min. The absence of wax eliminates wax expansion cracking, but the pattern’s higher green modulus compared with wax means that long, unsupported thin struts can transmit stress to the primary coat if shell drying is uneven. Final castings are poured in CF3M grade stainless steel at 1550–1600°C and certified by chemical analysis against ASTM A743/A743M-21; non-destructive dye penetrant inspection follows ASME BPVC Section V, Article 6 or the purchaser’s substitution. Terminal outputs are machined or as-cast industrial fluid-contact components such as small radial impellers and valve bodies, where the pattern resin provides dimensional repeatability but does not contribute to final material properties. Published data for ETEC Easy Cast 2.0 in thin-shell industrial configurations is limited for extreme geometries, so foundries qualify each geometry with a test flask before serial shell coating.

In low-volume dental implant bar processing where the final alloy is a type 4 titanium or a titanium-based alloy, ETEC Easy Cast 2.0 is handled as a sacrificial pattern only inside cells equipped with water-cooled copper-crucible induction melting and argon backfill. Printed bars and bar overdenture substructures at 50 µm layers are oriented horizontally with support contacts limited to 0.2 mm; any open porosity in the pattern after washing traps isopropanol and creates gas defects during the rapid radiant burnout prior to titanium casting. The pattern is invested in a phosphate-bonded refractory mixed at 100 g powder / 20 mL special liquid / 8 mL distilled water, and the mold is burned out with a slow 2°C/min ramp to 300°C, then a 3°C/min ramp to 900°C and a 2 h soak under forced air. Titanium ingots are cast at 1650–1700°C under argon; mold fill in thin bar sections below 0.5 mm remains process-dependent, and published data for this resin in titanium-specific configurations is limited. Final implant bars must satisfy device-specific biocompatibility under ISO 10993-1:2018 and cytotoxicity under ISO 10993-5:2009; the resin itself is not present in the finished device. Operational boundaries include withholding the resin from any direct contact with titanium investment mixing liquids containing amines, as amine contamination can inhibit surface cure of unwashed pattern recesses. Terminal products are cast implant support bars and overdenture frameworks that are subsequently milled, passivated, and anodized.