Protolabs  

True silicone is 100% pure silicone that is available in different shore-A hardness as detailed below. The material is suitable to produce both functional prototypes and end-use products, which can be used in a temperature range of -30°C to +180°C (-22°F to +356°F).

The material shows high resistance to harsh environments conditions, various acids, bases and nonpolar solvents. Silicone parts are water repellent, insulating, and have a high gas permeability.

Silicone has passed the following tests for biocompatibility: ISO DIN EN 10993-05 (tests for in vitro cytotoxicity) and ISO DIN EN 10993-10 (tests for irritation and skin sensitization).

The material is offered in two colors:

• Translucent white: Available in all durometers
• Black: Available for 60A

Primary benefits include:​

• high temperature and wear resistance
• elasticity and high reproducibility after deformation or stress
• a range of durometers (20A to 60A)

After the parts have been 3D printed, they are transferred into a smoothing chamber. Using controlled evaporation, a vaporized smoothing agent condenses on the parts’ surfaces creating a controlled chemical melt.  

This process reduces peaks and troughs on the surface by liquifying and redistributing material evenly in a carefully controlled atmosphere. Once finished, the equipment evacuates the finishing agent to a collection vat so there is no residue left on the parts.