Vodkaman Posted January 12, 2008 Report Share Posted January 12, 2008 The plaster is very porous, I don't think air spaces would give a problem. If you drop a chunk of cured plaster into a glass of water, you will see it bubble as the air inside is replaced by water. When I dry the plaster in an oven, I find that I can remove the cast with my bare hand, the insulating properties are that good. My strategy would be to prime the PoP with heat, in an oven prior to use. Another idea would be to cast coils of copper tube (micro bore) inside the PoP block and around the bowl insert. This would act as a heat reservoir, to be primed in the oven before use. Quote Link to comment Share on other sites More sharing options...
hazmail Posted January 12, 2008 Report Share Posted January 12, 2008 Yes here I am Bruce, as usual just read this thread. I'm thinking my dad, - blokes who build brick kilns, pottery kilns etc, use a special cement (insulating), called fire clay or something like that- I remember it was very light and was an excellent insulator - HUmmm maybe it was full of asbestous !!. Surely there is a brick kiln builder on here. pete Quote Link to comment Share on other sites More sharing options...
criggster Posted January 12, 2008 Report Share Posted January 12, 2008 One thing to keep in mind is that the majority of the heat will escape via the open top of the container. So, if you could fashion a pop lid of some sort to cap the top with you could probably extend your heat retention time by a factor of at least 1.5 Quote Link to comment Share on other sites More sharing options...
Tman2 Posted March 26, 2009 Report Share Posted March 26, 2009 Just resurrecting this old post because of a question in another thread, plus it's been on my mind since I'm in a colder region. Anybody have some pics they would share? Ghost had one up, but it's gone now. Pictures are worth a thousand words... Quote Link to comment Share on other sites More sharing options...
