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topic 487

Electroforming a copper mold


HI this from Santiago Chile,south America. we are sculptors and do different work as service to outsiders,mainly foundry work.(ceramic shell casting ) we were contacted for the following job: take the "copa America ",( a soccer trophy) about 20 " and do a full 2 meters amplification.
We could cast the thing (a round revolution jar )but the tag price was to high for the client budget ( us 7.500 ) then I had the following idea.
Why not electroform the thing in copper? The plan goes like this ,we will build a full size original and a polyester resin mold in 2 parts (no retention), bolted together and sealed and do the electric bath on the inside of the mold? We now the mold can be coated with an electro conductive paint? (need info in this matter) a release coating is probably needed? (info too please ) also never did anything like this, how does it look? Too farflung? we can easily handle the mold matter (got experience and we know what it takes to build a 1000 liters resin mold) but on electroforming :-( we have the electric power source but need info as soon as possible

thanks in advance

roberto grimberg
art shop - Santiago, Chile


Dear Roberto, The best way to do something like what you want to do is to take your original model and make a 2-piece mold in RTV cold cure silicone, pour in from the bottom of the mold a casting wax, when you get a wax casting,paint it with a conductive silver paint then plate it with acid copper to desired thickness and dissolve the wax away with trichlorethelene. Or you could plate around a piece of polyester.


David Guleserian
- Rhode Island

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