Author Topic: Plaster of Paris, Investment, etc.  (Read 10424 times)

Offline awemawson

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Re: Plaster of Paris, Investment, etc.
« Reply #25 on: August 05, 2014, 01:32:14 PM »
Yes my late brother tried that approach with a frog, but it didn't work when he put it back together  :bugeye:
Andrew Mawson
East Sussex

Offline mattinker

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Re: Plaster of Paris, Investment, etc.
« Reply #26 on: August 05, 2014, 02:30:47 PM »
Here's something to have under your hat for later, the microwave is a good way to accelerate drying of small pieces of plaster . I have not yet tried de-waxing using the microwave, it should be good as you can heat things up nice and slowly.

Regards, Matthew

Offline vtsteam

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Re: Plaster of Paris, Investment, etc.
« Reply #27 on: August 05, 2014, 02:44:02 PM »
That sounds good Matthew, and another interesting part of that is that it heats more evenly throughout. Rather than the heat having to penetrate through from the outside.

I remember from one of Steve Chastain's advanced casting books that plaster of Paris (is it okay if I just say poP from now on?) is used for pouring basin or sprue insulating liners in casting work. poP is I think the best insulator found for this.

So if it is such a good insulator, I imagine that would slow down regular convection heating even more, compared to microwave heating. That could account for a good chunk of the time required.

I love it when a Plan B comes together!
Steve
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