Polystyrene VS Closed Cell Foam

Discussion in 'Anything DIY Related' started by RiaanP, 6 Sep 2011.

  1. RiaanP

    RiaanP Moderator

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    Which one is better?

    I'm using closed cell foam (Polyethylene) on my setup. I prefer the black strip under the tank instead of the white polystyrene.

    But which one is better. I know polystyrene is available in different hardness levels.

    Which one does have the better properties

    1. What is the weight limit that each type can support.
    2. Do they build up memory?
    3. Do they collapse eventually?
    4. Water retention, including mildew resistant, rot resistant and will not discolour.
    I know the closed cell foam cuts easier and neater than the polystyrene. And it does not break or give that little bits off. And kids cannot discover that they can stick their fingers into the support.

    Any comments.


     
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  3. Jeann1

    Jeann1

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    Also using the closed cell foam (Polyethylene) black under my tank. As far as i understand, its better as its a foam and does not eventually become break-up. also agree that it looks better.
     
  4. Tony

    Tony

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    I've always used polystyrene, but get my cabinet to cover it and the bottom of the tank so it's not visible. My last tank I had for about three years and when I sold it I gave the same piece of polystyrene which was still perfect, except for stains, but it was in one piece and never broke apart. I also found the polystyrene never collpased under the weight and was flat but it was a nice dense/hard piece. My last tank was about 800 litres plus the weight of the tank and contents. I never found any mildew or mould, just some stains from spillages and some rust. I have never used foam so I cant comment there
     
    Last edited: 6 Sep 2011
  5. blackghostknife

    blackghostknife

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    HI Riaan

    I'm so glad you started this thread, cause from the long conversation we had two weeks ago about this issue and I still get mixed reactions

    :tomcat:
     
  6. Louis Scheepers

    Louis Scheepers

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    Tagging... I also want to go for black closed cell foam, because it looks better! WIll see what everyone thinks!
     
  7. Bob the (reef)builder

    Bob the (reef)builder

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    The black closed cell stuff is great, just be very sure that you get one that is very dense as if not it colapses under weight. I suppose this depends on the weight it is going to support , but rather too dense than not.
     
  8. Dewald@Dorry

    Dewald@Dorry

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    We vote polystyrene!!:thumbup:

    The black foam collapses far to often. Even with the intense density, if you plan your scaping on one side of the tank and have the other side open, the entire side where the rock are stacked, gives way.
     
  9. RiaanP

    RiaanP Thread Starter Moderator

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    Last edited: 7 Sep 2011
  10. RiaanP

    RiaanP Thread Starter Moderator

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    What size tank was that?
    Is the full base of the tank supported? Or just the parts where it lies on the metal frame?
     
  11. RiaanP

    RiaanP Thread Starter Moderator

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    Last edited: 7 Sep 2011
  12. RiaanP

    RiaanP Thread Starter Moderator

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  13. Trasique

    Trasique tahir

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    @RiaanP what density and thickness foam are you using, and how is it holding up?
     
    Last edited by a moderator: 26 Nov 2015
  14. Visser

    Visser MASA Contributor

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    I actually use both at the moment.
    I have discovered a Polystyrene called EPP (expanded poly propylene)
    Its quite hard, & after it is compressed, it returns to its original shape.
    You also get it in a black rubber color that works great for cube tanks where it is going to be exposed.
    Unfortunately, its a bit more expensive, but it lasts forever.
    My second pick is closed cell foam.
     
  15. RiaanP

    RiaanP Thread Starter Moderator

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    its 100%.
    I prefer the black under the tank instead of the white, less distraction.

    Not sure on the density
    but the code is 20JMPX
    Bought mine from John Moffat Prolock, southside of Johannesburg
     
  16. Trasique

    Trasique tahir

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    @RiaanP

    20JMPX......
    20 is the thickness
    JMPX should be followed by a number indicating the density

    also approx how much weight is this supporting
     
    Last edited by a moderator: 26 Nov 2015
  17. RiaanP

    RiaanP Thread Starter Moderator

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    oops

    20 JMPX 350 Black 1000 X 2000
    They charged me R372.52 excl VAT
     
  18. RiaanP

    RiaanP Thread Starter Moderator

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    My tank is 1500mm by 750mm by 750mm.
    10mm glass all around
    total volume is 750L

    In all, at least 1000kg.
     
  19. Trasique

    Trasique tahir

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    Last edited by a moderator: 26 Nov 2015
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