Don
It eats aluminium, copper it just tends to weld itself to.
But you should consider the risks involved in using AS5.
What risks, I have used it for years on both CPU's and GPU's. I do nothing other than apply a blob as per the instructions for the CPU/GPU.
Got around to removing the IC Diamond from my H80 and my god its left pretty bad discoloration on the CPU and on the base of the block. While it did give me good temps, I would treat this stuff as snake oil. Anyway replaced it with GC Extreme, hopefully will be able to give it a good stress test myself, boy that stuff was easier to spread than the IC diamond (IC is like cement, I had to warm it up just to get out of the tube)
For your information sir I did not spread the IC diamond, I used the proper application method as described on their website. The only point I was making was that to actually get the stuff out of the tube in the first place that I had to use hot water to warm it up and I have corrected the original post so the wording is clearer
Get Thermalright Chill Factor 3 as well or your test wont be complete