Making a mold out of polystyrene

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    • #1469
      Katherine Swift

      This question comes through email by Kevin:


      I have some acrylic resin I would like to use in a project of mine (the resin is based on polymethyl methacrylate (PMMA) also known as acrylic glass or plexiglas) and I was wondering if I could build a simple mold made of solid polystyrene (not styrofoam).
      If I pour the acrylic glass resin into the solid polystyrene mold, will it act as an adhesive and “stick” inside? Will I be able to get the piece of acrylic glass back out of the polystyrene mold or will it bind to the mold? Would a release agent work or be needed?
      The mold wont be anything complicated, just a cube shape.

    • #1470
      Katherine Swift

      Hi Kevin,

      I wouldn’t expect this to work very well. I don’t know that it will take the heat of curing resin, plus, I would expect it to release a lot of bubbles into your resin casting.

      We have mold making supplies in our store here:

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