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herman herman is offline

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Showing Visitor Messages 1 to 3 of 3
    08-11-2014 10:44 AM
    Hi Herman, hope you are OK, just would like to hear your expert opinion in this:
  2. herman
    04-19-2012 06:20 AM
    I believe this has been answered, if not, you can contact me anytime.
  3. jbocek
    04-11-2012 09:13 PM
    Hi Herman,

    I'd like your expert opinion re cataylists for vinylester resins.

    Which cataylist will provide longest possible gel time on a single layer laminate of 9oz 7781 eGlass/wet layup/vac bagged? Laminate size = 12 feet x 6 inches. I need enough time to wet out the cloth, remove bubbles, add a stack of: peel ply, perf release film, bleeder/breather, bag and pull a medium vac.. all 5-10 min before the resin gels so any excess resin can be pulled from the laminate into the bleeder/breather...

    Oh, BTW.. I'm in AZ (USA) with ambient temps of 70-75 degrees (AM) and 90+ degrees during the daytime. I need a USA suppier for whatever cataylist you recommend...

    Thanks for your help!

    Phoenix, AZ

    In a post last year you mentioned the follwing:

    MEKP-9: a slowe version is MEKP-9H, even slower is MEKP-925H, some 3 times as slow as MEKP-9. The peroxide for keeping viscosity low is HDP-75. Excellent wetting of the fiber, approx same results as MCP peroxide

About Me

  • About herman
    naval architecture, composites
    looking for new challenge


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  • Last Activity: 08-19-2017 02:46 AM
  • Join Date: 10-14-2008
  • Referrals: 4


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