Been there, done that.
The usual stuff works up to 300C, depending on your definition of works. At
higher temperatures it goes brittle and breaks down. I wouldn't use it for
over 250C, and even that'll probably break down after a while. It works ok
at 200C. YMMV.
As said, you want the 'other' stuff that's rated for higher temperatures.
You can get various paints as well meant for kilns, may be work looking at.
Tony
> Don't want to over simplify your issue, but couldn't you put a piece of
the
> fibreglass wool [grab a bit from your attic insulation] in the oven, set
it to the
> highest temperature and leave it for a couple of hours and see what
> happens? being fibreglass i would imagine it could withstand well over
250c
> hope this helps
>
>
> --- In Homebrew_PCBs@yahoogroups.com, "ftkalcevic" <frank@...> wrote:
> >
> > I'd like to improve the efficiency of my cheap toaster oven.
> >
> > I suspect it is like all ovens - a thin sheet metal oven in a thin sheet
metal
> enclosure. And no thermal protection around the control electrics.
> >
> > I'd like to use a thermal insulator, either wrapped around the oven, or
just
> something stuffed into the gap between oven and shell. I'd also like to
> protect the gap on the right where electronics will go.
> >
> > Any idea what kind of cheap insulator I can use for that? I've used
ceramic
> blanket before, but a strip 50mm wide was very expensive.
> >
> > Is household fibreglass insulation wool capable of withstanding the
300C+
> temps?
> >
> > Thanks,
> > Frank