RE: Silicon molding help needed

From: Bathsheba Grossman (
Date: Thu Dec 11 2003 - 01:17:41 EET

On Wed, 10 Dec 2003, Deanda, Jerrold wrote:
> We do a bit of silicon rubber molding and the only time we've had trouble
> with surfaces not curing was when we used modeling clay to fill out the
> parting line around the master. The toy store clay has something in it (I
> can't remember the exact material) that inhibits the material from curing on
> the surface against the clay.

I thought it was the sulfur in the plasticene that caused this?

> My choices to try would be the PTM&W mold release, (no
> measurable buildup if you need an accurate part) or good ol' vaseline...
> It's surprising how well this old stuff works. You can put it on real thin
> and wipe it off until you can just barely see it on there. Works better
> than some of the exotic (read: expensive) special mold releases sometimes.

Score another vote for vaseline -- so low-tech I didn't wanna mention
it, but it works good.


Bathsheba Grossman                 phone (831)429-8224, fax (831)460-1242
Sculpting geometry                                
Solidscape prototyping                           
Protein crystals                             

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