The stuff we use is 3M type 425, which is 4.6mil thick, and is good to 300 deg F. Here is the tech data sheet on it
http://www.mpsupplies.com/3m425_427AluminumTape.pdf
3M does have a different high temp version (good to 600 deg F), that's 3.6mil here:
http://solutions.3m.com/wps/portal/3...be7B57ZGTP85gl
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES