When I was researching the following Laptop, there was some really handy info about static energy. Just a couple of little excerpts from ...."Maintenance and Service Guide
Compaq Evo N610c and Evo N600c" which I found really interesting.
NOTE: the formatting is a bit skewiff below as I cant paste tables in. Ive tried to fix it a bit, so I think youll get the drift.
4.4 Preventing Electrostatic Damage
Many electronic components are sensitive to electrostatic
discharge (ESD). Circuitry design and structure determine the
degree of sensitivity. Networks built into many integrated circuits
provide some protection, but in many cases the discharge contains
enough power to alter device parameters or melt silicon junctions.
A sudden discharge of static electricity from a finger or other
conductor can destroy static-sensitive devices or microcircuitry.
Often the spark is neither felt nor heard, but damage occurs.
An electronic device exposed to electrostatic discharge may not
be affected at all and can work perfectly throughout a normal
cycle. Or the device may function normally for a while, then
degrade in the internal layers, reducing its life expectancy.
Table 4-1
Typical Electrostatic Voltage Levels
Relative Humidity
Event .................................. 10% 40% 55%
Walking across carpet ......................35,000 V - 15,000 - V 7,500 V
Walking across vinyl floor..................12,000 V - 5,000 V - 3,000 V
Motions of bench worker.................. 6,000 V - 800 V - 400 V
Removing DIPS from plastic tube ......... 2,000 V - 700 V - 400 V
Removing DIPS from vinyl tray ........... 11,500 V - 4,000 V - 2,000 V
Removing DIPS from Styrofoam .......... 14,500 V - 5,000 V - 3.500 V
Removing bubble pack from PCB ......... 26,500 V - 20,000 V - 7,000 V
Packing PCBs in foam-lined box .......... 21,000 V - 11,000 V - 5,000 V
A product can be degraded by as little as 700v
HTHs
Cheers
Joanne