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De-gassing Molds

Discussion in 'Molding and Casting' started by Cripplecreek, Mar 18, 2010.

  1. Anybody ever tried to degas a mold using some type of container & a vacuum cleaner?

    Also, if you are using something to encase your mold like a paper towel tube, can you degas it still? All these questions relate to molding bird heads.
  2. Steve Rotramel

    Steve Rotramel We got some radical rebels in this county!

    Vacuum cleaner won't do it. Needs to pull 28 inches of mercury.

    When degassing, you need about 3 times the container space for the moment that the rubber suddenly and profoundly expands releasing all the trapped air at once. The paper tube will work as long as you have that much space to prevent overflow.

  3. Thanks. I was just wondering. I get a few bubbles here & there on my heads. With the amount of birds I mount in a year, it's a vacuum chamber probably isn't worth it.
  4. donanton

    donanton I don't have a motto. Thats my motto.

    Put the molding liquid as high as you can, the liquid will thin as it falls and any bubbles will pop. Make sure you make a hole just large enough for the mold liquid to come out to ensure a thin stream.