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DSM Somos SLA
Somos WaterShed AF
Antimony-free investment-casting pattern resin designed for lower ash residue after burnout.
More from SomosSomos WaterShed AF is a multi-purpose SLA resin made for investment casting patterns. It is formulated without antimony to address sensitivities when casting certain speciality alloys. Patterns leave much lower ash residue after burnout, which reduces clean-up and speeds up mould production.
Key properties
| Property | Value (UV post-cure) | Test method |
|---|---|---|
| Tensile strength | 46 MPa | ASTM D638 |
| Elongation at break | 10% | ASTM D638 |
| Flexural modulus | 2,030 MPa | ASTM D790 |
| Izod impact (notched) | 34 J/m | ASTM D256 |
| HDT at 0.46 MPa | 50°C | ASTM D648 |
| Water absorption | 0.31% | ASTM D570-98 |
| Antimony | No detectable levels | ICP-AES |
| Colour | Clear |
Figures from the Stratasys Somos materials overview (2025), after UV post-cure, using the ASTM methods shown. Values vary with machine, processing and post-cure. Product description checked on stratasys.com in October 2026.
Key benefits
No detectable antimony
Trace amounts of ash that are easily removed
Low viscosity and rapid draining
Dimensionally stable
Suitable for high-end alloy castings
Accurate, repeatable patterns regardless of size
Typical applications
Investment casting patterns
Castings for aerospace and aviation
Castings for transport, energy and utilities
Supply in the UK
Supplied by Europac 3D for UnionTech SLA printers. Stratasys list Somos WaterShed AF as compatible with large-frame, 355 nm laser-based open stereolithography printers. See the rest of our UnionTech SLA resin range. Somos WaterShed AF is priced on application, so ask us for a quote and tell us which machine you run.
Supplied for UnionTech 355 nm SLA machines only: the Pilot, RSPro, RA, D600 and Lite ranges. Confirm the exact model and resin profile with us before ordering. Not for UnionTech SLM metal, DLP or LCD systems, or for other printer brands.
Works with these machines
Profiles are pre-tuned for these. Running it on something else is usually possible — ask and we will tell you honestly.
- UnionTech Pilot Series SLAIndustrial SLA in an open material system — run Somos or any resin that suits the job. PILOT 250 and PILOT 450, from a 250 mm to a 450 mm platform.View machine →
- UnionTech RSPro Series SLALarge-format industrial SLA up to a 2.1 m build — full-size parts, props and patterns in one piece, on a completely open resin platform.View machine →
- UnionTech RA600SLA printer for tyre mould production. Build volume 600 × 600 × 400 mm, tread patterns held to ±0.1 mm.View machine →
- UnionTech RA900Dual-laser SLA printer for tyre mould production. Build volume 950 × 550 × 400 mm.View machine →
- UnionTech Lite 600 2.0Compact industrial SLA for small-batch production of general parts. Build volume 600 × 600 × 400 mm.View machine →
- UnionTech D600SLA printer set up for dental and orthodontic models. Build platform 600 × 600 mm.View machine →
