Re: Investment life


Bramblebush ForumsFAQ

Posted by Jesse Brennan on April 02, 19100 at 13:05:48:

In Reply to: Re: Investment life posted by bpfink on April 02, 19100 at 08:56:45:

I agree with Bruce 100% on hydrated is better. I think the steam formed transfers heat better to the wax surface. This accelerates melting at the surface early in the heat up. This clears the mold of wax quicker with much less chance of stress cracking the mold thru wax expansion. The mold is held at a relatively constant temperature of 212 F during the dehydration and initial bulk dewaxing step. This results in a a low differential stress accross the mold. Pre removal of the sprue core is also a super idea.

In industrial ceramic shell molds autoclave dewaxing pushes higher pressure steam thru the shell at about 300F. Wax removal is fast but not totally complete.


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