2mm coremat

Discussion in 'Fiberglass and Composite Boat Building' started by brokensheer, Oct 23, 2012.

  1. brokensheer
    Joined: Jun 2009
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    brokensheer Senior Member

    what is the correct way to install cormat ,, using 2mm in a FRP layup,

    Thanks
     
  2. waikikin
    Joined: Jan 2006
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    waikikin Senior Member

    Usually embedded into a layer of chopped strand mat & overlaid with the same, most important is to back wet the core mat before placing it to the laminate so it don't scavenge resin from the underlying mat, also make sure you wet it out fully as it's really resin hungry or it wont do the job, also gets hot with the high resin usage/thickness so not too high in catalyst % but stay in acceptable range.Jeff............. Do a small test!
     
  3. brokensheer
    Joined: Jun 2009
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    brokensheer Senior Member

    Jeff I follow you on the application, , heat and so forth do you recomend working it with a plains resin riller ( mohair) or a grooved roller
     
  4. waikikin
    Joined: Jan 2006
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    waikikin Senior Member

    You need both, the resin roller to apply resin- the coremat will absorb heaps, online somewhere there will be a chart with resin uptake on it probably in kilograms per mm of thickness per meter squared, the grooved roller you need to tidy & consolidate the chopped strand mat that should be used in conjunction with the coremat.Jeff.
     
  5. Herman
    Joined: Oct 2004
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    Herman Senior Member

    600 gram / mm / m2.

    So for the 2mm version, 1200 grams of resin per sq meter.

    Or some 3 lbs per 10 sqft.
     
  6. tunnels

    tunnels Previous Member

    First why use 2mm core matt??
    what is the reason for wanting to use 2mm ??
    as a core to stiffen 2mm its next to useless !!
    as a way to build thickness ina panel and save a little wait again useless !!
    As a barrier to stop glass fibre print through ,ok !!
    The worst thing you can ever do using any thickness of core matt is underwet and starve it from resin !!
    Its best to use wet csm under ,and wet one side of the core matt and lay the wet side down onto the csm ,wet completely and totally to the point of excess !! then a layer of csm over and wet also and roll firmly with a hard wide roller ,mop the surface with a mohair roller than leave to harden completely .
    it has its many uses and is a good product just have to think where and how you are going to use it !!in panels that flex and have lots movment think !!
    It will shear and shear from ened to end !! so theres situations where it should never be used !!:)
     
  7. tunnels

    tunnels Previous Member

    This the first post i ever seen where the amount of resin has been specified !! thank you !!
    always people scimp on resin and underwet which is the worst possible thing to do to it !! :)
     
  8. Herman
    Joined: Oct 2004
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    Herman Senior Member

    Specifying on resin is simple: READ THE DATASHEETS. Actuall read the datasheets of all products you use.

    As for the usability of 2mm Coremat: There are many applications where it makes perfect sense. Also as a structural core.

    I just specified the stuff (infusion Coremat, or corrected: Lantor Soric) in a part that used to exist in only 2x 200 gr/m2 carbon. Which gave a laminate thickness of 0,4mm. The client was surprised his part was a bit flimsy. As he wanted to infuse, I specified a layer of 2mm Soric in between. Gave a perfectly strong product. And the weight: Considerably more, but weight was absolutely not critical. Carbon was there only for the "brag factor".
    Part it replaced in porcelain weighed 50 kgs, carbon with Soric 1,5 kg, and the flimsy part a couple hundred grams. See everything in perspective.
     

  9. tunnels

    tunnels Previous Member

    Sorry if i was a bit missleading !!!. on bigger jobs thin core matt is pointless unless it a barrior skin .
    the guys where im working were using it on a 38 foot deck and piling on loads of glass each side !! absolutely pointless .!!! so up the thickness and replaces d 3 layers of glass and is much better !stuffer and lighter !!:):p:D:p
     
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