Juniper MX960 Hardware Manual page 500

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CAUTION: The weight of the DPC is concentrated in the back end. Be prepared
to accept the full weight—up to 13.1 lb (5.9 kg)—as you slide the DPC out of
the chassis.
When the DPC is out of the chassis, do not hold it by the ejector handles, bus
bars, or edge connectors. They cannot support its weight.
Do not stack DPCs on top of one another after removal. Place each one
individually in an electrostatic bag or on its own antistatic mat on a flat, stable
surface.
11. If you are not reinstalling a DPC into the emptied DPC slot within a short time, install a blank DPC
panel over the slot to maintain proper airflow in the DPC card cage.
CAUTION: After removing a DPC from the chassis, wait at least 30 seconds
before reinserting it, removing a DPC from a different slot, or inserting a DPC
into a different slot.