RE: Silicon molding help needed

From: Deanda, Jerrold (
Date: Thu Dec 11 2003 - 02:43:54 EET

Ah Bathsheba, you are a hot dog....yup, that's what I remember, now you say
it. Thanks for the memory jog.


-----Original Message-----
From: [] On Behalf
Of Bathsheba Grossman
Sent: Wednesday, December 10, 2003 3:18 PM
Subject: RE: Silicon molding help needed

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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