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Thread: Porosity and really bad casts. Is it investment or something else.

  1. #1
    Join Date
    Aug 2022

    Default Porosity and really bad casts. Is it investment or something else.

    Hi. Still struggling here.
    Attached are photos of my issues
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    I'll try to be brief. Sterling silver metal. 50% new, 50% used.
    3d print of Jamghe castable resin. Also tried Phrozen purple. Cured resin as per recommended. The print is perfect.
    Plasticast invest. Following recommended everything. Deionized water. Temp 22-24 C. Followed times and degassing.
    Burnout @ 730. Followed Plasticast recommended schedule. Have varied with longer holds and even higher temp.
    Kayacast casting machine. Furnace melting. No borax as graphite crucible. Cast as quickly as I can.
    But a lot of porosity on some, and less on others.
    I'm at 700 M above sea level so suspected the vacuum.
    Spoke to Kayacast as the machine doesn't get to 29 but we've eliminated that.
    A new suggestion is the investment. I've had it for about 4-5 months. It has always produced light brown staining as shown.
    No idea what causes that. It doesn't change, regardless of the burnout schedule.
    So I'm at a loss about what to try next.
    Any help would be extremely appreciated.

  2. #2
    Join Date
    Oct 2010


    Were you able to find and solve the issue?
    I am thinking of buying a Kayacast-like tabletop casting setup but your problems are making me nervous.
    Hoping to hear back from you,
    Thanks in advance


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