Re: Metal Prototype

From: Martin Koch (
Date: Mon May 03 1999 - 18:36:30 EEST

Traditionally a casting method called The Rubber Plaster Method was used to prototype die-castings.
In this method a urethane rubber take-off mold is created from the master pattern with its gating system. The rubber mold
is then used for casting a plaster mold with a special plaster that is subsequently treated to enhance its permeability.
This method yields die-casting like pieces.
It is an old method with a few variations: the Antioch process, permeable metal casting plaster, etc.
good luck

Peter SL Chan (IC) wrote:

> I've heard that it is possible to make thin wall diecasting metal prototype by investment casting with vacuum assisted.
> Would anyone kind enough to share their experience,no matter good or bad, on this topic with me?
> I've heard that The SpeedVac 960 system from SpeedForm in Germany can do such kind of job.
> Would any SpeedVac users share their experience with me?
> For more information about the rp-ml, see

For more information about the rp-ml, see

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