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3 Pound Vs. 5 Pound Foam

Discussion in 'Molding and Casting' started by pir^2h, May 18, 2019.

  1. May 18, 2019 #1
    pir^2h

    pir^2h Retrievers give you the bird

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    Does one expand more than the other? I am thinking it has to do more with density than expanding but I want to be sure before I order it.
     
  3. May 18, 2019 #2
    3bears

    3bears Well-Known Member

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    From my experience it has to do with density only. The higher density foam is much harder to cut or sand. I use the 3 lb for most things just because of it.
     

  5. May 18, 2019 #3
    Frank E. Kotula

    Frank E. Kotula master, judge, instructor

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    yes the less density expands a lot more than the higher # foams plus it weighs more. So 3 lb will expand more than 5 as 10 will expand less than 5.
     
  6. May 18, 2019 #4
    3bears

    3bears Well-Known Member

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    Interesting Frank, I did not realize that but, then I've never compared them side by side.
     
    Frank E. Kotula likes this.
  7. May 18, 2019 #5
    pir^2h

    pir^2h Retrievers give you the bird

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    Thanks for the info Frank. That answered my questions!
     
    Frank E. Kotula likes this.
  8. Jun 10, 2019 #6
    Polymer Guy

    Polymer Guy Member

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    If you need a source, let me know. TC-300 from BJB has a range of different densities and they do have a 3-Lb. And yes, the lower you go the lighter the foam as well as the weaker the foam. But because of the light weight, you'll certainly be able to sand it easier.
    The TC-300 gives you about 50 seconds of work time via drill mixing and pouring before it begins to rise.