Casting copper?

Discussion in 'General foundry chat' started by garyhlucas, Jul 23, 2020.

  1. Jason

    Jason Gold

    It's not a flux, the broken Glass protects the melt.
  2. rocco

    rocco Silver

    Am I correct in thinking that purpose of the glass is that it will melt, float on top of the copper creating a physical barrier between the copper and the air thus reducing the amount of copper that gets oxidized? Or does it serve some other purpose?
  3. Tobho Mott

    Tobho Mott Silver Banner Member

    That's my underatanding of it. Here is one explanation I was given in a youtube comment after posting a video of a copper pour:
    I'd always understood that oxygen was the big enemy when pouring copper as you say, with hydrogen being more of a problem for aluminum. But regardless of such details, Sandrammer's point was that yes, the glass is used to shield the melt from the atmosphere.

    Last edited: Jul 26, 2020
  4. Jason

    Jason Gold

    Yup! That's what Richard says.
  5. garyhlucas

    garyhlucas Silver

    So I have a couple of bottom pour crucibles. A pipe comes up the side so you are pouring from the bottom of the melt. Might that be a good crucible for this? If I put the glass in there the pour would come from under the glass.
  6. metallab

    metallab Silver

    It is a good idea, but most crucibles are attacked by a glass slag ....

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