mould for prepreg

Discussion in 'Fiberglass and Composite Boat Building' started by cergun, Apr 17, 2013.

  1. cergun
    Joined: Jan 2012
    Posts: 5
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    Location: Istanbul

    cergun Junior Member

    Hello, I will build a mould for prepreg carbon rudder stock. I will use 140TG hexion epoxy as resine and will use glass UD, My question is should I use carbon instead of glass because the product will be carbon or still can I use glass as mould material and it will not affect seriously.. what do you advise??
     
  2. wet feet
    Joined: Nov 2004
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    Location: East Anglia,England

    wet feet Senior Member

    Use a carbon mould.The thermal expansion coefficient differs for carbon and glass and the movement may cause you problems.Unfortunately this is the more expensive answer.
     
  3. groper
    Joined: Jun 2011
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    Location: australia

    groper Senior Member

    Have you looked at CNC your mold from billet aluminium stock... easy and precise...
     
  4. cergun
    Joined: Jan 2012
    Posts: 5
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    Location: Istanbul

    cergun Junior Member

    So I am switching to carbon then, yes I checked alu milled mould but its much more expensive, length is more than 2 meters so it requires bigger machine and cnc shops are full these days and they are asking expensive prices..
     
  5. rxcomposite
    Joined: Jan 2005
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    Location: Philippines

    rxcomposite Senior Member

    We used only cold molded fiberglass tooling for our high temperature, vacuum bagged, oven cured aerospace parts. The secret is in the high temperature rated tooling resin we used. For dimensional accuracy, the molds are allowed to expand and contract on the metal tooling frame by having "free floating joints" so that it can expand in the X, Y, and Z axis.

    Reserve the carbon fiber tooling to autoclave.
     

  6. latman
    Joined: Mar 2010
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    Location: Australia

    latman Junior Member

    surely machined "hard" aluminuim moulds will have enormous thermal expansion differences compared to the carbon parts being made ?
     
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