min. HG to infuse

Discussion in 'Fiberglass and Composite Boat Building' started by brokensheer, Nov 3, 2009.

  1. brokensheer
    Joined: Jun 2009
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    Location: So. Md

    brokensheer Senior Member

    I am working on a few small test panels 1fot square and on that is 1'x2' long, what is the min hg needed to infuse? my pump pulls 25hg, , My intent is to work my way up to doing a section 4'x8' consisting of three layers of 2415 stichmat at one time,, Thanks
     
  2. brokensheer
    Joined: Jun 2009
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    Location: So. Md

    brokensheer Senior Member

    Well I can tell you now 25hg works like a charm!
     
  3. marshmat
    Joined: Apr 2005
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    marshmat Senior Member

    25" Hg vacuum leaves almost 5" Hg of pressure in the bag. This will not prevent a flat panel from infusing, but can be enough to cause problems on more complex shapes.
     
  4. brokensheer
    Joined: Jun 2009
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    Location: So. Md

    brokensheer Senior Member

    Marshmat, so do I umderstand you in that 30"hg is what I should target?, The pump I have only pulls 26-26hg, ,

    can you suggest a pump that will work better? Thanks
     
  5. JRL
    Joined: May 2007
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    JRL Im with stupid

    I believe a Robinair 15600 will pull 29" at sea level.
     
  6. KnottyBuoyz
    Joined: Jul 2006
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    Location: Iroquois, Ontario

    KnottyBuoyz Provocateur & Raconteur

    My Robinair 15600 pulls 29". I think we're only a couple hundred feet above sea level. Higher vacuum works better on more complex shapes as Marshmat said. Your 26" should be fine for flat panels. Size of the flat panel doesn't matter much it just takes a bit longer to draw down the full layup to 26". I use a vacuum switch to keep my small flat panel projects between 25" and 27". This prevents the higher vacuum from sucking all the resin out of the stack.

    Fabrics with stitched on mat don't infuse too well without a flow media.
     

  7. brokensheer
    Joined: Jun 2009
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    Location: So. Md

    brokensheer Senior Member

    Thanks More light shed on the project the better!
     
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