hi,

a couple more things about abrasive microblasters.  you need to validate everyone's equipment.  for example, it is not enough merely to supply ionized air to the blasting chamber.  the nozzle needs to be grounded as well as the work.  often this is not sufficient.

it takes some pretty sophisticated equipment and great experimental techniques to assure that the part you are blasting is not being exposed to excessive voltages.  using an instrument that monitors air ionization is not enough.  you need to wire your assembly into an electrostatic voltmeter.

also, be aware that different materials generate wildly different amounts of esd.  there is a polymeric material sold by solidstrip, inc called solidstrip l that used to be the material that generated the least amount of esd.  solidstrip's no. is 302.292.8340.

finally, there is a mantech report (tr94-1) from the army that you would probably find useful.  the last name and no. for a contact was: jeffrey m. carr, 205.876.1661.

phil

-----Original Message-----
From: Kang Zhang [mailto:[log in to unmask]]
Sent: Thursday, March 16, 2000 2:57 PM
To: [log in to unmask]
Subject: [TN] ESD issue with microblast conformal coating removal


Hi, all

Are there any literature, standard, industry guidelines/specifications done
on the
effects of rework and conformal coating removal on ESD?

Any information is appreciated.

Kang Zhang
Reliability Engineer
ELDEC Corporation

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