Per ESD Handbook TR20.20 section 2.4 Sources of Static Electricity
"Theoretically, any two items or materials brought into contact and then
separated can liberate static electricity."
Per section 5.5.5 Tribocharging "Tribocharging from equipment can be caused
by conveyer belts, hardware sliding on surfaces, and moving fluids (sprays)
or solids (sandblasters). Moving gases that are free of particulates, e.g.
from air guns, fans, or heat guns do not tribocharge an insulator or
conductor. If rapid air movement causes parts or dust particles to rub
together, tribocharging might occur."
So if the compressed air is clean, there should be no charge generation.
However, if one uses compressed air ionization, one can neutralize charges
while dealing with ESA or ElectroStatic Attraction. This is where charged
particles cling to products causing contamination problems. Using
compressed air ionizers, the ionized air flow can be directed where it is
needed and remove particles by neutralizing the charge and blowing the
particle off.
Gene Felder
[log in to unmask]
-----Original Message-----
From: Korringa, Stuart (AGRE) [SMTP:[log in to unmask]]
Sent: Monday, October 04, 2004 8:53 AM
To: [log in to unmask]
Subject: [TN] Compressed air vs. ESD Concern
TechNetters,
Is the use of compressed air for removing loose foreign object an
ESD concern for CCAs?
Stuart Korringa
Product Quality Engineer
Smiths Aerospace
Electronic Systems- Grand Rapids
3290 Patterson Ave. S.E.
Grand Rapids, MI. 49512-1991
Phone: 616.241.8189
Fax: 616.241.7736
E-mail: [log in to unmask]
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