Re: Prototyping

From: Doug Groh (
Date: Mon Jan 01 2001 - 19:54:18 EET

With the melt temp of Pewter at 400 degrees Farenheit, I do believe that silicon
rubber would work. I was using silicon rubber for pouring Low melt alloys
containg tin bismuth at approximately 310 degrees. I used a silicon rubber mold
and put it immediately after pouring, into a pressure pot at about 65-75 pounds
(paint pressure pots are readily available from Paint supplies or Graingers.)
eliminated any air bubbles in your part.

Doug Groh
Director APDS
PGK Engineering
185 Elmwood
Troy, MI, 48084

248-577-9869 fax
248-310-6198 cell

David Bolack wrote:

> Excuse this bit. I come from way left field of the engineering industries. :)
> Not having much luck investigating the different rapid
> prototyping processes out there, I'm turning here for some advice.
> We're investigating using rapid prototyping to create masters for molds
> for pewter figures. It's a fascinating technoology that looks like it
> could be used in this capacity, possibly far more cheaply than hand
> sculpting. What I can't quite find out is what processes would survive the
> 400 F temperatures for making our molds.
> Anything that will take detail well and survive making the mold would be
> acceptable. Low cost, naturally, is a plus. :)
> Any pointers or direct advice would be greatly appreciated.
> For more information about the rp-ml, see

For more information about the rp-ml, see

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