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Three Easy Prep Steps for Using Mold Release

( 06/11/2019 ) Written by: Shaily Shah

Preparation is the key to success—but prep work takes time and money. Fortunately, if you choose the right mold release product for your rubber-to-substrate molding, the prep will be quick and painless.

Industrial, automotive and other industries use rubber-to-substrate molding machines that operate by injection, compression, transfer or similar means. Molded elastomers, including EPDM, natural rubber, nitrile and neoprene, need to have a release agent applied inside mold cavities so they don’t stick upon removal.

Things to look for when choosing a release agent:

  • Fast cure
  • Multiple molding cycles accommodated with a single application of release agent
  • Little buildup on the mold cavity, which results in less cleaning time
  • A supplier that can provide tech service for the entire molding process, from rubber compounding and adhesives to the mold release agent

Our LokRelease™ mold release solutions achieve all the above.

When using your mold release agent, there are three prep steps to ensure good results:

  1. Preheat the mold to the desired molding temperature. (For molds that have not had previous release agent applications, the mold should be cleaned prior to preheating.)
  2. Apply the mold release. For best results, use an HVLP gun with an extension nozzle, which helps reach into recesses and cavities.
  3. Cure the release agent prior to molding parts. (For molds that have not had previous release agent applications, a second coat will provide optimal performance. Subsequent applications only require one coat.)

That’s it—you’re ready to mold parts!

After repeated molding cycles, the release agent will need to be reapplied. Indications that it’s time to reapply include difficulty extracting parts or a change in the elastomeric parts’ appearance. Touch-ups can be applied at any time to areas of the mold that are complex or experiencing problems with part release. If necessary, release agents can be removed from molds using plastic bead blasting.

LokRelease offers many benefits. Its semi-permanent, anti-stick coating promotes good rubber flow. Easy release from molds prevents defects in molded parts. Time is saved with LokRelease compared to other mold releases which require constant reapplication—so manufacturing lines keep moving. LokRelease also cures to the molding cavity so it does not transfer to the parts.


Shaily Shah is a business development intern at LORD Corporation, focused on mold release agents. She collaborates with our customers and technology teams to deliver solutions for their application requirements. 

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