Mold release and coating for silicone parts

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This topic contains 2 replies, has 3 voices, and was last updated by  steven 1 year, 10 months ago.

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  • #425

    sk72w429
    Member

    Recently I am trying to use the 5 durometer silicone material for our product, we found that this low durometer silicone material is very sticky and causing release problems from mold.
    Do you know what type of coating can help silicone part to remove from mold?
    I read your manual, on the one Silicone Molding on slide number 106 Undercuts, it suggest that Isopropyl Alcohol can be used to help remove parts with undercuts.
    How do we apply the Isopropyl Alcohol on the core to make it effective?
    Is there any mold release or coating contain Isopropyl Alcohol with FDA approval in the market?

    #436

    Silicone.Pro
    Member

    Low durometer parts do tend to be sticky, fortunately they also tend to be very elastic. For easier release of molded parts, we would recommend a nickle teflon coating on the tool. You can also try seasoning/conditioning the mold with a material that is easier to run. Basically, you just run numerous shots of a material that you are comfortable running to fill any micro structures in the tool. After 50 shots or so, you’ll start to notice the difference. You can try using a blast of compressed air to drive the part out of the cavity as well. Alcohol can act as a lubricant and causes silicone to become a little more pliable, on a hot mold it evaporates quckily so you’ll need to act fast. There are lots of commercially available mold releases, some of them are FDA approved, some are not, some work well, and others don’t, but one of the best mold releases (also cheap and easy to make) can be created by mixing equal parts dish soap, distilled water, and Isopropyl Alcohol.

    Hope this answers your question, if not, feel free to ask any other questions you have!

    #547

    steven
    Member

    Nickel to be plated on all of molded surface is good help.

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