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Black material on back of N5040 CPU heatsink?

Hi, i disassembled an N5040 laptop, for LCD replacement. I did an extensive deep cleansing of all the parts. when i removed the CPU heat-sink, i noticed some kind of black material around the edges of the thermal compound, resembling a type of sticker. when i cleaned the heat-sink with alcohol, the black material was also removed. what was that black material? is it necessary to replace it? (or i can ignore it while reassembling) if so, how can i replace it? and where would i look for it? P.S just for clearence, im not talking about the thermal compund.. i know i have to replace it. i found a picture of it on a replacement heatsink, on ebay: http://www.ebay.com/itm/Dell-Inspiron-I15N-N5040-Series-Laptop-CPU-Fan-Heatsink-Y2JM0-0Y2JM0-/180950793458?pt=LH_DefaultDomain_0&hash=item2a2181fcf2

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Hi, these are thermal plastic sticker to make the thermal paste in tack and in place. as long as you know how to apply the thermal compound in the right way there's no need to replace it.
thanks

Posted on Mar 31, 2014

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