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When I rewired the PGR I also added the same insulation I had ordered for my new-project-Kilogram Roaster.
It turns out that the hi temp furnace insulation does not seem to be what is needed at these low coffee roasting temperatures.
Even though I had more of the hi temp stuff, the outer wall of the roaster gets HOTTER! s:4:@s:3
So forget about ordering special insulation. I recommend that you stay with plain fiberglass insulation. It is used for water heaters, walls, ceilingsand pipe wrap. It is fireproof and can be obtained from any hardware store or building supply outfit.
It works great in my PGR and the more expensive stuff seems poor in comparison

The outside of my roaster stays cooler to the touch when I use it instead of using the hi temp stuff.
Another few bucks in savings:D
Needless to say that I will be replacing the furnace insulation with fiberglass. ;)