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The Overmolding Process – Preparing and Filling the Mold 7/8

We took on the challenge of over-molding a part handle with a 2-part epoxy material to make it easier to handle and more durable. Without specialized equipment our expert designed and printed a mold to see what we can learn about this process and what challenges to watch out for.

The basic steps to follow include:

    • Spray the mold thoroughly with mold release spray 
    • Prepare a surface for the molding process that can be cleaned or discarded to avoid damaging your work surface
    • Assemble, clamp, and/or seal the mold together around the part. Clamps, rubber bands and putty are useful but this can be accomplished in many ways
    • Mix the 2-part over-mold material. If possible, choose one that flows well and degass it in a vacuum chamber to remove as many bubbles as possible
    • Fill the mold until it is completely full up to all vent holes. Design the mold in a way that will make it easier to fill this than using only gravity, such as using a syringe or a large bowl to fill with material and allow the material to flow down slowly.
    • Allow the material to cure 
    • De-mold the part and cut off any material in the vent holes that are not needed for the final design.

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Get help from our team by Calling us at 800-364-1652 x 4. You can also get assistance by clicking the Technical Support button or the Email Our Experts button below. 

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