Table 7. ESD Voltage Measurement Data for Glass Bead Media
|
Conformal Coating Type |
Sample ID |
Microblaster Parameters |
ESD Surface Voltage (Volts) |
Electrostatic Field (Volts/Inch) |
||||||||
|
Temp. (°C) |
Relative Humidity (%) |
Media Flow Rate (1-10) |
Gas Pressure (PSI) |
|
Site 1 |
Site 2 |
Site 3 |
Site 4 |
Site 5 (w/o ESD control) |
|||
|
Urethane |
U9 |
22 |
49 |
2 |
60 |
Min. Max. Avg. |
* * - |
-44 -51 -47 |
278 288 283 |
850 776 813 |
-1763 -1888 -1825 |
1800 2000 - |
|
Urethane |
U10 |
22 |
49 |
2 |
60 |
Min. Max. Avg. |
280 303 291 |
¤ ¤ - |
140 145 142 |
545 558 551 |
-1786 -1806 -1796 |
213 1690 - |
|
Parylene |
P9 |
22 |
49 |
2 |
60 |
Min. Max. Avg. |
* * |
-898 -860 -879 |
-929 -940 -934 |
-926 -935 -930 |
-1919 -2097 -2008 |
56 150 - |
|
Parylene |
P10 |
22 |
49 |
2 |
60 |
Min. Max. Avg. |
-100 -122 -111 |
-706 -725 -715 |
-510 -528 -519 |
-823 -830 -826 |
-1821 -1827 -1823 |
5 59 - |
* Measurement error due to accidental probe contact
¤
Coating could not be removed
Table 8. ESD Voltage Comparison Data for Various Medias
|
Media Type |
Average ESD Surface Voltage (Volts) |
|||||||||
|
Coating Type |
||||||||||
|
Urethane |
Parylene |
|||||||||
|
Site 1 |
Site 2 |
Site 3 |
Site 4 |
Overall Average |
Site 1 |
Site 2 |
Site 3 |
Site 4 |
Overall Average |
|
|
Wheat Starch |
25 |
25 |
16 |
66 |
33 |
-21 |
-28 |
-18 |
25 |
23 |
|
Sodium Bicarbonate |
-113 |
-152 |
-112 |
-100 |
-119 |
122 |
-214 |
-474 |
-597 |
-352 |
|
Plastic Bead |
-20 |
-22 |
-204 |
-202 |
-112 |
25 |
-45 |
-240 |
-559 |
-217 |
|
Glass Bead |
291 |
-47 |
212 |
682 |
308 |
-111 |
-797 |
-726 |
-878 |
-628 |
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