How Many Layers of 1700 for 1/4"

Discussion in 'Boat Design' started by Brian Gentile, Mar 11, 2020.

  1. Brian Gentile
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    Brian Gentile Junior Member

    Deciding on using 1708 vs 1700 and need to build to a total of 1/4"

    How many layers does it take to get to 1/4" using 1700.

    1708 looks like its 6 layers.
     
  2. TANSL
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    TANSL Senior Member

    In the 1/4 " thickness, is the resin included or do you only count dry fiber?
     
  3. wet feet
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    wet feet Senior Member

    Will there be vacuum consolidation?
     
  4. Brian Gentile
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    Brian Gentile Junior Member

    I am looking for how many layers will it take using west system and 1700 wetted out and hit with a fin roller to get to 1/4"
     
  5. bajansailor
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    bajansailor Marine Surveyor

    Do you have your material already?
    If yes, then maybe make up a couple of test samples using the two different kinds of mat - they could be just 3" or 4" square.
    Build up the layers and see how many it takes when you are rolling out with a fin roller.
     
  6. Brian Gentile
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    Brian Gentile Junior Member

    I dont have any 1700 just 1708.
     
  7. gonzo
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    gonzo Senior Member

    Do you have 1700 or 1708? If you have 1708 and are using 1708 it shouldn't be a problem to make a test coupon.
     
  8. Brian Gentile
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    Brian Gentile Junior Member

    I have 1708 and tested that already and 6 layers get me to 1/4". I do not have 1700 so not sure how many layers to get to 1/4"
     
  9. gonzo
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    gonzo Senior Member

    What type or resin are you using?
     
  10. fallguy
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    fallguy Senior Member

    Hand laminated 1708 runs around 0.040" per layer, vac about 0.035".

    Vac bagged 1700 is about 0.023, hand laid about 0.028.

    I run the vac high, not sure if that would make a difference.

    But do keep in mind the strength comparisons are not equal. 1700 for the same thickness is stronger and even more so if you can turn the bias, although that is true for both..
     
    Last edited: Mar 11, 2020
  11. Brian Gentile
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    Brian Gentile Junior Member

    West System
     
  12. ondarvr
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    ondarvr Senior Member

    What is the reason for 1/4”?

    If strength has nothing to do with it, 1708 will get you there. The laminate will be resin rich and have less strength than the same thickness of 1700 though.

    1700 will give you a lighter and less costly laminate for the equivalent strength of a 1708 laminate.
     
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  13. gonzo
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    gonzo Senior Member

    1708 fabric is 0.044" thick. 6 layers make 0.264" thick which is more than 1/4" (0.25"). That is a dry stack. Each layer will be thicker when wetted.
     
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