Thicknes of 400g fiberglass sheet + epoxy

Discussion in 'Fiberglass and Composite Boat Building' started by Anze, Jan 30, 2018.

  1. Anze
    Joined: Jan 2018
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    Location: Slovenia

    Anze New Member

    Hello all,
    i have a question for which i didnt find close answer anywhere.
    So i turn to you.

    What do you think it would be estimated thicknes of an plate, i would make with single sheet of 400g fiberglass and nice fat cover of epoxy.

    So thicknes of finished hard plate.

    Like, 1mm, 2mm, 3mm ..?

    I know you cant say it precicely, but what is your guess ?

    I hope you understand me, and i am most thankfull to anyone who is willing to help.
  2. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    Pretty close to 1 mm.

    17 oz tapes with csm run 0.037” alone. The epoxy is subjective. 400g would be a little thinner-but 1mm should be close on the nearest mm.

    A word of caution though. Thick epoxy weakens the lamination. You really want it just right at about 1:1 by weight.. This ration will draw some criticism...touche’; the main point is valid. Consider a lot of epoxy-the layup would be more and more brittle.
  3. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

  4. Anze
    Joined: Jan 2018
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    Location: Slovenia

    Anze New Member

    Oh, thank you FallGuy and Tansl for your help !
  5. Tungsten
    Joined: Nov 2011
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    Location: Canada

    Tungsten Senior Member

    I had the same question years ago, .55mm hand applied approx 70/30 resin fabric. .33mm when infused under full vac.

  6. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Most of the major fabric suppliers have laminate calculators (usually designed around their products of course), which will very accurately offer the answers you might need. The real key is; will this laminate meet the strength and stiffness needs you may have. A little math will fix this.
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