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  1. #1
    fastolds is offline Hot Rolled
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    Default porous material?

    Anyone know of a material that is machinable, won't corrode in water and is porous enough to suck water and air through it?

  2. #2
    RLM3 is offline Plastic
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    Try sintered stainless steel. Does it have to support a lot of weight or be a strong part of a structure? http://www.smallparts.com/products/descriptions/pxx.cfm

    Butch

  3. #3
    fastolds is offline Hot Rolled
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    Large molds will be made out of the material so it has to be economical. It doesn't support much weight.

  4. #4
    jim rozen is offline Diamond
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    Bronze sinter.

    Jim

  5. #5
    Peter Neill is offline Hot Rolled
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    Have you thought about using Porcerax?

    http://www.porcerax.com/

    Peter

  6. #6
    fastolds is offline Hot Rolled
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    If I could find a tough plastic that had different micron filtrations to try in say a 4" x 24" X 24" piece, that might work.

  7. #7
    fastolds is offline Hot Rolled
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    I will look at porcerax.

  8. #8
    surplusjohn is offline Diamond
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    there are lots of foams that are machinable and are open for water, also there is a foam glass that is normally closed cell but is available reticulated, also know as fart rock, used as a fire proof insulation. depends on what you are doing.http://www.crestfoam.com/bull101new.html

  9. #9
    claudev is offline Aluminum
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    Default Porous Materials:

    A number of refractory materials are porous and, at least to some extent, machinable. Contact some of the industrial refractory supply companies (or installers) in your area. You will find more of them than you think. Probably can get samples. Both insulating firebrick and castables come to mind. We (employer) used to use them before I retired.

    A number of metals are available in sintered form and with varying porosities.

    If we knew your application we could better recommend something.

    The pottery industry uses plaster of Paris as molds to suck the water from casting slip - everything from toilets to pots.

  10. #10
    E. Bobicki is offline Cast Iron
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    Default

    I would suggest nickel foam, but I'm not sure what the retail price would be, how large are these molds going to be? On the other hand, there are some refractories as mentioned, we use a type of alumina that comes in various porosities, from vesuvius, it is used widely as a filter in casting operations, so it is disposable. It is easily machined too.

  11. #11
    fastolds is offline Hot Rolled
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    The molds could be 8" X 24" X 24" larger or smaller. They sit in water so aluminum corrodes fast. Currently using a plastic but not porous. It has to have a bunch of holes drill in it which isn't practical.

  12. #12
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    Motomoron is offline Hot Rolled
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    Back in my lab instrumentation days I made a few things from porous PTFE. Expensive and a little difficult to work with.

    http://www.microporeplastics.com/porous.htm

    Maybe some useful info?

  13. #13
    Damien W is offline Stainless
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    Is there more information on the sheets of sintered bronze. A website maybe?

    I have a couple of sheets which I suspect is this material and would like to know how it might be utilised.

  14. #14
    surplusjohn is offline Diamond
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    Default

    I recall seeing an artical about using a cast material, possibly an aluminum epoxy mix for making vacuum forming molds.

  15. #15
    Mike Henry is offline Stainless
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    How about porous plastic, like one of the polyethylenes (LDPE, HDPE, or UHMW)? We fabricate something similar at work for propietary R&D projects, but there are probably fabricators out there that can make something for you. Machinability might be a problem, especially for the lighter grades of PE.

    Mike

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