Vinyl Ester Resin Post-Cure Mandatory?

Discussion in 'Materials' started by Johnfirstime, Nov 20, 2018.

  1. Johnfirstime
    Joined: May 2017
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    Johnfirstime Junior Member

    I am planning to infuse some rather large parts and was considering the use of a vinyl ester resin. I was wondering if it would be possible to only cure vinyl ester at ambient temperature without it ever seeing a high temperature post-cure? Are vinyl ester resins stable enough to be cured at only room temperature and will they gain sufficient strength? I recognize additional strength can be gained with a high temp post cure but I am not too concerned with having the highest strength possible and would prefer not having to heat cure these parts.

    Thanks in advance for your input!
     
  2. ondarvr
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    ondarvr Senior Member

    Its not that common to post cure items made with VE resin, not that it can't be done, because it will increase the physical properties, it's just that for most applications it's not needed.
     
  3. Johnfirstime
    Joined: May 2017
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    Johnfirstime Junior Member

    Thank you for the reply. This was the feeling I had but it is reassuring to hear this advice from those more experienced than me.

    I've seen some VE data sheets and they usually mention a post-cure when listing the mechanical properties of the resin. Would you estimate that a non-post cured VE resin will achieve only about 70-80% of the strength and stiffnesses advertised?

    Thanks again!
     
  4. rxcomposite
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    rxcomposite Senior Member

    In general VE resin mechanical properties is a little bit lower than regular cured epoxy. Epoxy can attain good strength at ambient air curing. Post curing VE will raise its mechanical properties equivalent to a ambient air cured epoxy. But then, epoxy can be post cured, raising the bar higher again than post cured VE resin.
     

  5. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member


    Yes, most Data sheets do list the post cured physical properties of a resin, it's really the only way to compare them apples to apples.
     
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