36509Re: Just starting out
- Sep 1, 2006Not wrong enough to be a problem!
Adding insulating blankets outside the refractory is meant to keep heat
IN, maybe help keep the outer walls/workshop cooler.
My furnace has ONLY 2 inch thick 3000 degree refractory lining - no
ceramic wool etc. Starting from cold, it takes about 30 minutes before
the outer shell is too hot to touch with the fingers. Since I run it
out of doors, heat in the workshop is not a consideration.
Home made refractory is definitely the hard way to go since ready-made
is so easily obtained from foundry supply companies. In addition, the
commercial product will meet temperature specifications or the company
will hear about it in no uncertain terms!
--- In firstname.lastname@example.org, "Dave Mucha" <dave_mucha@...> wrote:
> I thought that refractory was to be harder and rated for higher temps
> and was the inner liner, if there are more than one liner, refractory
> is the one in direct contact with the heat source. That refractory
> got some abuse other than thermal and should be hard(er).
> and that the insulation liner was the outer liner and it's purpose was
> to prevent heat transfer. it has no real requirement for strength
> other than being strong enough to hold things in place.
> And that separate layers are not required, but that any layer that is
> in contact with direct heat should be rated for more heat.
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