Re: [rp-ml] Shrinkage in PU castings

Alternatively, depending on the type of the silicone and the PU that you
are casting, it is also possible to heat the mold before casting. By
doing so you expand the mold. The expansion cancels the shrinkage then.
Please keep in mind you need to have experience with this before trying
it out.

Cheers!

Bob Olsen wrote:

> Yes, need to plus up the master pattern for the specific shrink of the
> urethane and silicone you are using. Regards, Bob
>
> -----Original Message-----
> *From:* Kiran [mailto:office_mail_3@yahoo.co.in]
> *Sent:* Wednesday, September 15, 2004 6:16 AM
> *To:* rp-ml@rapid.lpt.fi
> *Subject:* [rp-ml] Shrinkage in PU castings
>
> Dear Friends:
>
> I've got a very fundamental question.
>
> "Do you have to add shrinkage in the RP masters before they go
> into Silicone Rubber Molding?" I'm experiencing dimensional
> variations in PU castings...
>
> Thanks in advance!!
>
>
> Warm Regards,
>
> Kiran
>
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-- 
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