What is the black tape that secures the fans to the heatsink?

It seems simply to be a high-quality electrical tape, but just to be sure, could somebody take a micrometer to it? I suspect that it's 3M Super 33, which, for reference, is 0.18 mm thick.

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It doesn't matter what tape you use there. It's just there to seal the gap between fan and heatsink. You could use anything that doesn't melt at 80 degreee C.

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