Pewter casting

[DAVIS125]

I'm trying to cast small pewter medallians with detail similar to a state seal; an image with lettering around. I've tried rtv molds but they provide no detail, maybe a gas venting problem? Also tried sand mold which was a bit more successful but left a grainey texture and some detail loss.
I have no high temp facilities at this time so I'm limited to low temp alloys.
Any suggestions or comments on how to accomplish this project?
Thanks,


:group:

[WILSON47]

These low temp melters are cast commercialy in Silicon rubber molds using a centrifugal method. See Cast Tin (http://www.nathantrotter.com/) for some of the supplies and equipment for this.