Somos 7120

Description

Somos^® 7120 Photopolymer is a humidity tolerant, high heat deflection temperature, low-curl, high-speed liquid that produces rigid, high accuracy parts. It produces exceptional undistorted thin walls and down-facing surfaces and exhibits good processing latitude.

Application

Somos^® 7120 Photopolymer is used in the solid imaging process to build three-dimensional parts and is intended to be used with a layer thickness of approximately 0.152 mm (0.006 inch). After part formation via UV light exposure, the excess resin is removed by rinsing with a solvent such as propylene carbonate or tripropylene glycol monomethylether (TPM), followed by a rinse in isopropyl alcohol (IPA or isopropanol). The part is post-cured by UV fluorescent light and, optionally by heat.

Physical Properties – Liquid

Appearance	Transparent Amber
Viscosity	~700 cps at 30° C
Density	~1.13 g/cm³ at 25°C

Optical Properties at 355 nm

Initial values for determining working curve for a solid state laser operating at 355 nm.

*E_c*	8 mJ/cm²
[critical exposure]
*D_p*	*0.123 mm (4.8 mils)*
[slope of cure-depth vs. ln(E) curve]
E₅	23 mJ/cm²
[exposure which produces pane 0.127 mm (5 mils) thick]
*E₁₀*	64 mJ/cm²
[exposure which produces pane 0.254 mm (10 mils) thick]