Proprietary binder and coating
The ExOne® binder system has been formulated to be
water soluble up to 350°F, which allows for high temperature
curing of many composite materials. The printing media
available are silica and ceramic sand.
After printing, a sealant coating is applied to the surface of the tooling
to prevent resin migration into the tool from the composite part.
Coating options include a spray-on coating system based on the
binder chemistry, which is also water soluble, or a Teflon® tape wrap.
When the composite lay-up is completed and cured, tap water is applied
to the mandrel ends to begin the washout process. Washout is completed
in a matter of minutes and leaves no residual material behind.