In a tent in the Sahara desert? Or anywhere else...field conditions. Don't know if there are air ionizers for use in such conditions? Do they exist? Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James Sent: den 27 mars 2007 13:26 To: [log in to unmask] Subject: Re: [TN] ESD charges in conformal coatings Why not brush the boards under an air ionizer? Jim Marsico EDO Corporation Amityville: 631-630-5079 Bohemia: 631-218-7057 [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: Tuesday, March 27, 2007 7:09 AM To: [log in to unmask] Subject: [TN] ESD charges in conformal coatings Hi all gnus and gurus, Sometimes, we need clean boards from dust and dirt. Field practise, no proffesional facilities. Not surprisingly, you move electrons from the conformal coating's surface. I have measured several kilovolts at a distance of one inch from the board. The highly insulating acrylic coating keeps the charges effectively for hours, quite expected too. ESD brushes not much better. Not even grounded ESD brushes works. I get rid of the surface charges if I dip the board in water, quite natural, because of the large contact area and polarisation media. EE in the US, did an investigation during 8 years. They ranged the 23 most common electrical failures and their sources. Conformal coating charges came as number 9. Question: anyone who can recommend a dust and dirt removal method, when dry brushes don't work and water is not allowed? Inge --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------