Materials for building molds stable to the post curing process @70°C

Discussion in 'Fiberglass and Composite Boat Building' started by Robinfly, Mar 2, 2020.

  1. Robinfly
    Joined: Dec 2019
    Posts: 14
    Likes: 2, Points: 13
    Location: Croatia

    Robinfly Junior Member

    Hello,
    I'm doing some research about materials and building technologies for molds that are used in carbon fiber boat building with post curing at 70°C.
    Does anybody have experience in this field that is willing to share knowledge?
    Thank you!
     
  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    Most normal tooling products will take 70C without much of a problem.
     
  3. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    I don't know diddly about it, but I would make one assumption. That would be to make sure all the coefficients of thermal expansion are not wild swings for anything staying in process.

    If nothing else, someone might tell me I am wrong.
     
  4. Dejay
    Joined: Mar 2018
    Posts: 520
    Likes: 83, Points: 28
    Location: Europe

    Dejay Senior Newbie

    Can you use foam for heated forms? Or does the gas in the foam expand at that temperature and deform the mold?

    I looked up glass transition temperature, is that when materials properly get soft?
    Glass transition temperature is 90°C for polystyrene / XPS and 82 °C for PVC.
     

  5. ondarvr
    Joined: Dec 2005
    Posts: 2,328
    Likes: 259, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    There is no specific HDT or TG for a polyester, VE or epoxy resin system, it’s the same for foams and other types of core.

    Each product has its own set of specs depending on its intended purpose.

    70c is at the very low end of what even the simplest and cheapest tooling products can handle.
     
    Last edited: Mar 4, 2020
    Robinfly likes this.
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