![]() ![]() The adhesive underneath is just a non-conductive silicon base by 3M. Kapton tape is a polyimide tape branded under Kapton. instead of "PVC," we'll use "mylar" and instead of "tape," we can say "ribbon" or "film" - since the closest thing comparable is a very thin film or ribbon. Just keeping things simple for the average DIY'er :) I can change my vernacular. Just thought I'd mention since you made note of the PVC comment. However, I suggest mylar as the likely material because of its very high tolerance/resistance to high heat. The older pieces like this in previous models were similar to this material. It is thick, non-pliable, and doesn't need to tolerate the kind of heat that is under the heatsink. The older ones, and the piece that goes over the integrated GPU (not the discrete w/ the heatsink) is most likely a pvc deriv. If you want to be technical, I believe the new ones (not the thick older ones) are made of a version of mylar or mylar blend. I can send you a diagram of that if you need it. They usually stick to the "tape," but will occasionally stay on the CPU or fall off, requiring you to place them back into their proper placement. Small black pieces down by the ESD kapton tape. TAKE NOTE: the CPU tape has small additional "strips" with adhesive on all four sides. Tapes Master - 1/2' x 36 Yds - 1 Mil Kapton Tape Polyimide High Temp Tapes with Silicone Adhesive - 3 Core - for 3D Printer Surface, Soldering, Insulation and Bonding - No Residue 8.95 8. Strong Rubberized Waterproof Tape (4-Piece) Shop this Collection. You also run the risk of damaging the components on the chips. Without this tape layer, you will likely fail a heatsink/CPU sensor test. This "tape" layer also helps regulate the even pressure applied across the chips and their sensors (this is tested with ASD software from Apple to determine whether or not the heat sink is set in place properly). It helps prevent the heat sink from damaging those bits (metal to components) while allowing the chips' "face" to touch or come within close proximity (with thermal grease) of the heat sink without damage. This pvc tape-like layer offers protection from the surface components on the GPU and CPU (note the bumps and small soldered on bits on both the GPU and CPU). ![]() Granted, this plethora comes from multiple models, but this should clear things up. These are the bits of "tape" to which you refer I gather. Paul - just trying to offer a bit of assistance with visuals. ![]()
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