HP ProLiant BL45p Server series - Manual (Page 33)

Hardware options installation 33
7. Remove the protective cover from the thermal interface.
CAUTION: After the cover is removed, do not touch the
thermal interface media.
IMPORTANT: The heatsink is not reusable and must be discarded if
removed from the processor after application.
8. Insert the heatsink and close the processor cage. Closing the processor cage
aligns the heatsink.