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
>