Somos® Element

A stereolithography material engineered to create flawless
investment castings

Somos Element Material Properties

Behaviour and use

Material Overview

Through continuous interaction with Somos customers, pattern makers and foundries, Somos® developed the groundbreaking stereolithography resin Somos® Element — the new standard for producing Investment Casting patterns.

Somos® Element is an antimony-free stereolithography material that has been specifically designed to improve the repeatability and quality of 3D printed casting patterns. Patterns created with Somos® Element leave trace amounts of lightweight, easily-removable ash residue after burnout and have good green strength, so there’s no worry of breakage during handling, while being dimensionally stable during storage. Any residue that is left behind is easily removed, leaving a perfectly clean void in the ceramic mold. This translates into lower mold prep times and lower rates of rework, saving customers time and money.

Key Benefits

  • Trace amounts of ash that are lightweight and easily removed
  • Suitable for high-end alloy castings
  • Rapid draining
  • Produces accurate, repeatable parts regardless of size

Ideal Applications

  • Investment Casting

Somos Element Specification & Features

Liquid Properties Optical Properties
Appearance Clear EC 10 mJ/cm² [critical exposure]
Viscosity ~125 cps @ 30°C DP 5.2 mils [slope of cure-depth vs. In (E) curve]
Density 1.11 g/cm @ 25°C E10 68.4 mJ/cm² [exposure that gives 0.254 mm (.010 inch) thickness]


Mechanical Properties UV Postcure
ASTM Method Property Description Metric Imperial
D638-14 Tensile Modulus 3,170 MPa 460 ksi
D638-14 Tensile Strength at Break 53 MPa 7.7 ksi
D638-14 Elongation at Break 2.3%
D570-98 Water Absorption 0.36%
D790-15e2 Flexural Strength 114 MPa 16.6 ksi
D790-15e2 Flexural Modulus 3,230 MPa 468 ksi
D256-10e1 Izod Impact (Notched) 22 J/m 0.41 ft-lb/in
D2240-05 Durometer Hardness 86


Thermal/Electrical Properties UV Postcure
ASTM Method Property Description Metric Imperial
E831-13 C.T.E. -40 - 0°C (-40 - 32°F) 56.8 µm/m°C 31.5 µin/in°F
E831-13 C.T.E. 0 - 50°C (32 - 122°F) 75.7 µm/m°C 42.1 µin/in°F
E831-13 C.T.E. 50 - 100°C (122 - 212°F) 137 µm/m°C 76.1 µin/in°F
E831-13 C.T.E. 100 - 150°C (212 - 302°F) 142 µm/m°C 78.9 µin/in°F
D150-11 Dielectric Constant 60 Hz 3.7
D150-11 Dielectric Constant 1 KHz 3.6
D150-11 Dielectric Constant 1 MHz 3.4
D149-09 Dielectric Strength 18.3 kV/mm 465 V/mil
E1545-11 Tg 58°C 136°F
D648-16 HDT @ 0.46 MPa (66 psi) 58°C 136°F
D648-16 HDT @ 1.81 MPa (264 psi) 53°C 127°F


Burnout Properties
Method Property Description
ICP Antimony Content Not detectable (<3 ppm)
TGA Ash Content <0.005 %

Stereolithography (SLA) Technology

Advantages of 3D printing Somos Element with a Stratasys Machine

What is Stereolithography?

Stereolithography (SL/SLA) was the world’s first 3D printing technology, and it remains a great option for highly detailed prototypes that require tight tolerances and smooth surfaces. It uses a UV laser to cure and solidify fine layers of photopolymer in an open vat.

Why choose SLA?

SLA is great for prototyping parts that will ultimately be painted or coated because the models can be finished using the same materials and processes as the end product. Transparent, heat resistant and moisture resistant materials are also attractive for medical, automotive and other prototypes that call for flow visualization, light transmittance or thermostability.

SLA benefits

Product designers opt for SL models when a quick build time is crucial, and they can invest time and resources into additional finishing processes. SL can also produce master patterns for urethane casting, and investment casting patterns that are used to produce metal parts for aerospace, automotive, power generation and medical applications.

SLA 3D Printing & Post-processing Machines

Machines that can 3D print and post-process Somos Element parts

Stratasys Neo Stereolithography 3D Printer

Stratasys Neo Stereolithography

Stratasys Neo Stereolithography SLA Resin 3D Printers for prototyping, tooling and master patterns with superior surface quality and accuracy.

DEMI 800 PostProcess machine

DEMI 800 Support Removal

The DEMI 800 Production Series 3D Printing Support Removal machine provides an envelope sized for a few large or several small 3D printed parts.

DEMI 200 PostProcess system

DEMI 200 Support Removal

The DEMI 200 Production Series 3D Printing Support Removal machine provides an envelope sized for a few large or several small 3d printed parts.

Need to 3D print with Somos Element?

Call us free at  1-877-219-6757  to speak to an expert, or send us your CAD model and we'll 3D print it with Somos Element material