Resin Transfer Molding

Overview
A reinforcing material is manually placed into a mold.  The mold is then closed and resin is injected into the part area.

Raw Material
The manual nature of this process allows for almost any reinforcing material to be considered, chopped strand or mat.  Similarly, the resin and catalyst blend can be manipulated to allow for ideal processing conditions.

Tooling
A core and cavity are necessary for RTM.  Tools can be made from composite materials or aluminum.

Finishing
RTM parts can be made with very good surface finishes, on either side.  Typically a gel coat will be introduced into the process to achieve better finishes.

Benefits Disadvantages
  • Flexibility in reinforcing materials
  • Can produce a very strong part
  • Improved thickness variation over other low volume processes
  • Higher cycle times
  • Higher tooling cost than lower volume processes
  • Can produce some thickness variation

 

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