So today I made a metal foundry with a 2/4 plaster 1/4 sand and 1/4 water mix and I put a glass jar in the middle of it to create room. But now the glass jar is stuck and I don't want to break it. Any ideas to get it out?

  • 1
    Break the glass into splinters, scrape them off the sides with an ice pick, then pour them out. Commented Apr 17, 2017 at 20:56
  • @HenryTaylor sounds like an answer?
    – Catija
    Commented Apr 17, 2017 at 21:54
  • Sorry I forgot to mention I don't want to break the jar.
    – Sanskros
    Commented Apr 17, 2017 at 22:09
  • Figured that... which is why I offered it as a comment rather than an answer. @terrariabat, can you attach a picture or provide more description of your project. From what you have provided, it is unclear whether the forged material envelops the jar (following its tapering shape) or just encircles the jar (leaving an open as big as the jar's largest demension through which it can be removed. Chances are that if it only encircles the jar, you can remove it by heating up the forged material until it expands and releases the jar. Next time use a mold release material such as Teflon spray. Commented Apr 17, 2017 at 22:57
  • 4
    Still. I encourage you to use your comment and flesh out an answer with it. Comments are fickle. Answers are best
    – Matt
    Commented Apr 18, 2017 at 2:27

1 Answer 1


My approach would be to carefully drill holes into the glass very near one another, and then gradually break pieces away with long nosed pliers, or if you have a dremel with a tip for grinding glass remove the glass that way once the holes are dilled. I'm assuming you can get to the glass, perhaps not.

A photo of the challenge would be a big help.

Am I assuming correctly the foundry can take a lot of heat? If so, then would a blowtorch on the glass melt it? (obviously the foundry will become exceptionally hot).

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