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Table 4-1 shows how humidity affects the electrostatic voltage levels
generated by different activities.
Event
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPS from plastic tube
Removing DIPS from vinyl tray
Removing DIPS from Styrofoam
Removing bubble pack from PCB
Packing PCBs in foam-lined box
NOTE: A product can be degraded by 700 volts.
Table 4-2 lists the shielding protection provided by antistatic bags and
floor mats.
Material
Antistatic plastic
Carbon-loaded plastic Floor mats
Metallized laminate
4-6
Removal and Replacement Preliminaries
Table 4-1
Typical Electrostatic Voltage Levels
Table 4-2
Static-Shielding Materials
Use
Bags
Floor mats
Relative Humidity
10%
40%
35,000 V
15,000 V
12,000 V
5,000 V
6,000 V
2,000 V
11,500 V
4,000 V
14,500 V
5,000 V
26,500 V
20,000 V
21,000 V
11,000 V
Voltage Protection Level
1,500 V
7,500 V
15,000 V
55%
7,500 V
3,000 V
800 V
400 V
700 V
400 V
2,000 V
3,500 V
7,000 V
5,000 V
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