Entropy epoxy

Discussion in 'Materials' started by pierreuw, Oct 9, 2013.

  1. pierreuw
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    pierreuw Junior Member

    Hello, I have been using West System for years, but I would like to get into infusion. On Jamestown site I have stumbled on entropy epoxy. Does anyone have experience with it? I would be using it for under waterline repairs. Thanks.
     
  2. michael pierzga
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    michael pierzga Senior Member

    No experience. I had a brief look at the website, saw lots of bio and eco friendly stuff but no info on secondary bonding, overcoat time.....

    Do you have any links.?
     
  3. pierreuw
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    pierreuw Junior Member

    No, only their website. I have emailed them and they have responded that it would be adequate to bond on polyester, vinyl ester and epoxy and for what I want to use it for. But before I order it to to do work on hulls, I would like to see if anyone has had the chance to test it.
     
  4. PAR
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    PAR Yacht Designer/Builder

    Maybe Paul O can drop in, but I think this might be some smoke and mirrors stuff, possibly just a rebadged product.
     
  5. ondarvr
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    ondarvr Senior Member

    Low viscosity infusion epoxies tend to be rather weak compared to the higher viscosity versions, this is a result of the solvents used to get the visc down to where it will infuse well.

    The physical properties of epoxy tend to drop below those of VE resin when both are used for infusion, so VE has become very popular with epoxy guys that are going to infusion.
     
  6. tom28571
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    tom28571 Senior Member

    Know nothing about it but you would be wise to look up the definition of entropy in a dictionary or physics book. Not very reassuring I'll bet.
     
  7. TANSL
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    TANSL Senior Member

    I guess they refer to the release of heat (or maybe not), not entropy as defined in thermodynamics.
     
  8. PAR
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    PAR Yacht Designer/Builder

    My guess, not seeing any material properties information, is they're substituting petroleum polymers for something they can sell as greener.
     
  9. pierreuw
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    pierreuw Junior Member

    True Tom!
     
  10. pierreuw
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    pierreuw Junior Member

    The price is interesting and in my case (I operate in Honduras), I would not have hazmat shipping charges ($400). I may buy a gallon to run some test.
     
  11. michael pierzga
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    michael pierzga Senior Member

  12. TANSL
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    TANSL Senior Member

    I see, "entropy" is just a trade name, does not refer to the physical properties of the product.
     
  13. PAR
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    PAR Yacht Designer/Builder

    A quick look shows West 105/205 is 7% higher in tensile modulus, 4% lower in tensile strength, 52% lower in elongation, 30% stiffer, 21% stronger in flex and 10% stronger in compression. Some pretty significant differences, particularly in flexural modulus and compressive strength.
     
  14. pierreuw
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    pierreuw Junior Member

    Some big differences for performance parts. My main concern for 90% of my work will be bonding quality to previous work and how it will handle long submerged time.
     

  15. michael pierzga
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    michael pierzga Senior Member

    Workability is the most important characteristic of any product. Low toxicity is also valuable.

    Ultimate physical properties are low on the list.

    Moisture barrier effectiveness should be on their website if they expect marine applications.

    secondary bonding and blush is also neglected


    Perhaps ask them directly

    And by all means Give it a try and tell us what you think.
     
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