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Mold making

Casting Metal in Molds

  • plaster for silver (both fine and sterling), ceramic for bronze, sand for iron, and selastic rubber for pewter. There's no issues with pouring metal into plaster,
  • Plaster does not melt; nor does ceramic, and sand is fine at the temperatures used for cast iron. Similarly, selastic is temperature resistant to a certain level, and pewter melts at a comparatively low temperature, so it won't melt in that case.

microwave melting -- there are inexpensive microwave kilns that will melt small amounts ("jewelry" quantities) of many metals.


Aquarium sand from a pet store is very find (or play sand but you have to sift it)

Kitty Litter (clay)

  • 95% or 90% sand with the clay, by weight
  • plastic bag and pound with a hammer, sift out the fine stuff (powdered sugar consistency)


  • so it's moist not wet, use a spray bottle
  • consistency where it'd be great to make sand castles


  • soda lime glass at 2200degrees
  • mold is closed to keep it hot and then opened when blower nears

CNC mold from 3d files

  • Step Files or IGS is the format to send someone, not STL, so they can make a file to cut a mold.
  • (STLs don't have curves, they're huge in filesize (means you have to scale it again when you open it)
  • at like 19:00


  • zircon or other very fine ceramic slurry
  • colloida-cilica binder and few cilica flowers is the liquid, water based
  • dries for up to 3 hours (2 to 3 degrees f)
  • 7 or 8 times
  • and a final 24 hour dry just to make sure
  • 68 degrees and then heated to melt the wax (they cool it to shrink so when it expands we dont crack the shell
  • half hour to an hour at 200 degrees
  • melt steel at 3000 degrees into oven at 1800 degrees and pour it into the (still hot) shell
  • they buy stamping scrap, washed


  • cilica, alumina, and some kind of flux, alongside pacifiers, colorants, whatever, feldspar, nephilim cyanide,
  • red iron oxide (deep green after gas-fired kiln in reduction atmosphere. If in oxidized atmos, putrid yellow


  • 28.35 grams in an ounce
  • a typical gold ring might be 3-7 grams
  • $20 per ounce of silver
  • $5 or so dollars to make a ring of silver

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