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  1. #1
    Rob590's Avatar
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    Vinylester resin

    Hi all...

    I'm new here on RCUniverse, but not new to the hobby...

    I have a question regarding vinylester resins... I know that they fall between polyester and epoxy resins...

    For now I have used only epoxy resin and never had trouble with it... Good thing was that my father always kept 50+ kg of epoxy for his sailplane... As his sailplane project goes to an end, so our epoxy stock goes out... We used Sika Biresin SR120 resin and Sika Biresin SH120-3 hardener...

    Now Igot access to cheap (read free) vinylester resins mixed per my needs by my friend who works at the resin factory...

    I would use vinylester resin only for covering my models with lightweight glass cloth and Iwould still use fast setting epoxys for construction...

    Is vinylester suitable for such application?

    Cheers,
    Robert


    Robert
    Corsair Brotherhood #74

    My build: http://www.rcuniverse.com/forum/m_10596500/tm.htm

  2. #2

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    RE: Vinylester resin

    Vinylester should work well for that. The major hobbiest drawback to vinylester resin is it's very short shelf-life. Once the container is opened it can go bad in as little as 3 months. There can also be some curing issues in humid conditions. I would consider using vinylesters for many applications but the short shelf-life makes it too impractical unless you're using it quickly. It will also attack polystyrene based foams so you have to use caution with foam core wings.

  3. #3
    Rob590's Avatar
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    RE: Vinylester resin

    Thanks for fast reply...

    Short shelf-life won't be a issue because I can get resin in small pots and I can get resin tailored per my instructions...
    Robert
    Corsair Brotherhood #74

    My build: http://www.rcuniverse.com/forum/m_10596500/tm.htm

  4. #4

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    RE: Vinylester resin

    Vinylester resin.

    I don't even like the sound of it.

    I've used Polyester resin for many years.

    I wouldn't change my winning game.
    Owner: CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder." cfcgraphics.com

  5. #5

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    RE: Vinylester resin

    vinylester resin is used by gm for the body panels on coorvettes and the likes, its a better resin than polyester, ,less shrinkage less brittle, etc. most new surfboards are vinylester if they arent using epoxy

  6. #6

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    RE: Vinylester resin

    If you check it out, you'll find that vinylester resin is superior to polyester. Check the following site for info: http://www.uscomposites.com/polyesters.html and then look at the description for the 700 Vinylester resin. I wouldn't mind trying it out myself sometime in the future. I've worked with both polyester and epoxy. Polyester gives you a harder finish but the smell is a killer in a confined spot. The epoxy I use is almost odorless and almost water thin too.
    J F Sohm - AMA# 192350 - IMAA# 15145
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  7. #7

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    RE: Vinylester resin

    Dang.....I just realized that I have now posted twice in this thread on the same topic. I'll leave it up since there is a bit of new info.

    The biggest downside to vinyl ester resin is its very short shelf life. Most manufacturers recommend using it within 3 month of it's delivery date. This works great for large shops that use lots of resin, but most hobbyists just aren't able to use it fast enough. You can also get vinyl ester in a unpromoted state. This will extend the shelf life. Before using, the promoter must be added to the resin. Then the hardener is added to the resin to make it cure. If the vinyl ester is unpromoted it will never cure no matter how much MEKP is added. WARNING: If you mix MEKP and the promoter directly it will explode. It's typically safest to acquire the vinyl ester that is pre-promoted and deal with the low shelf life.


    Adam



  8. #8

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    RE: Vinylester resin



    One thing to consider is vinylester resin has viscosity much thinner that epoxy. This may not be an issue, buit if you are covering balsa wood, I think it will be absorbed by the wood, making for a heavier part. This may or may not be bad, (more strength for the wood). Vinylester is usually a little higher strength, but don't be fooled, vinylester is a little more brittle.


  9. #9

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    RE: Vinylester resin


    ORIGINAL: Louis9624



    One thing to consider is vinylester resin has viscosity much thinner that epoxy. This may not be an issue, buit if you are covering balsa wood, I think it will be absorbed by the wood, making for a heavier part. This may or may not be bad, (more strength for the wood). Vinylester is usually a little higher strength, but don't be fooled, vinylester is a little more brittle.

    I always seal the balsa regardless of the resin. There are many high quality epoxy resins that have near the same viscosity as vinyl ester.

    Epoxy typically has a higher tensile, compression, and interlaminar strength than vinyl ester.


  10. #10

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    RE: Vinylester resin

    Good Lord, you guys are talking about brittleness and too thin a viscosity like you're designing the next generation of space shuttle. Everyone is going to have their preference as to what resin to use. Polyester or vinylester will give you a harder surface than the typical epoxy resin. But think about this, a lot of other guys are basically using a polyurethane paint to bond a layer of glass to the balsa. The glass cloth or whatever you decide to use to bond to the balsa is basically there to prevent the balsa from splitting or checking. It stabilizes the surface quality of the balsa. That's it in a nutshell. Whether you use polyester, vinylester or epoxy is your choice. I personally use epoxy since the smell of curing polyester is too strong and reminds me of an autobody shop. That's not to say that the vapors are more harmful than the epoxy. Epoxy vapors are not healthy for you either. You will never see me advocate heating epoxy in a microwave for instance to thin it out. Use the proper type epoxy for the job at hand. If the guy who started this thread can get vinylester at a reasonable cost to complete his models, more power to him. It will work fine. Just don't use it or polyester resin over bare EPS foam or you will end up with a big glob of goo. Remember, to thin polyester resin, you use styrene monomer and since EPS is Expanded PolyStyrene... well you get the picture.

    Well anyway, I'll get off my high horse now and I hope I didn't offend any one.
    J F Sohm - AMA# 192350 - IMAA# 15145
    If you're not catching any flak, you're not over the target.

  11. #11
    Bundubasher's Avatar
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    RE: Vinylester resin

    Hahaha, yes. Things that is important for me: is it lighter, stronger and/or cheaper?If it is harder (I use cotton flocs if need be) it is ok.

    Butif I have torun the risk of explosions andtoasting my family jewels when mixingMEKP and "additive b"together,it is not practical for me.
    My experience is that continental drift sometimes causes the Earth to jump up and knock a plane out of the sky......

  12. #12

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    RE: Vinylester resin

    I'm too old and too set in my ways to change my building habbits. Although I should probably learn a bit more about various offerings.

    My new buddy. A fresh can of Polyester resin.
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  13. #13
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    RE: Vinylester resin

    They do make Styro-safe Polyester resin, here is a link of a supplier. Great way to make one off's or plugs from foam. And yes vinylester smells the same as polyester resin to me. so use in well vented area.

    Darren

    http://www.expresscomposites.com/resins.html
    That's not flying, that's just falling with style!

  14. #14
    Rob590's Avatar
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    RE: Vinylester resin

    hey all

    I thought that this thread is dead, but wow, so many answers. Thanks for that.

    Yes, I can get vinylester for free, but I tried all systems and I'm sticking with epoxy. My epoxy supplier buys high quantities (1,5 tones) of high quality epoxy resin (Sika) and I get it from him at really low price.
     
    And epoxy is really nice to my foam based models (not that I attempted to use polyester on EPS, after all, I am chemical engineer )
    Robert
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  15. #15

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    RE: Vinylester resin

    Good Lord, you guys are talking about brittleness and too thin a viscosity like you're designing the next generation of space shuttle.  Lol Lol Lol -this one will be good to bring up during dinner-Lol Lol Lol

  16. #16

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    RE: Vinylester resin

    }vinylester resins }Better than sex!! I tried them all. Wear a mask and use it..kEEP IT IN THE FRIEG.AND LAST 2 YEARS..

  17. #17

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    RE: Vinylester resin

    I use vinylester resin on all my fiberglass boat layups would never use anything else good stuff stiff and strong.
    Centralrcmarine Performance Offshore RC model boats hulls


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