Ingemar, IPC-CC-830,Qualification and Preformance of Electrical Insulating Compound for PWB tells you e.g. about the required apperance of Conformal Coating. IPC-SM-840C, Table 1 lists all the requirements for the qualification of soldermasks. Adhesion Conformal Coating is one of them. But has to be agreed with user and supplier. Regards, Frank Inge <[log in to unmask]> Gesendet von: TechNet <[log in to unmask]> 24.08.2009 23:38 Bitte antworten an TechNet E-Mail Forum <[log in to unmask]>; Bitte antworten an Inge <[log in to unmask]> An [log in to unmask] Kopie Thema Re: [TN] Manual spraying, further qs Thanks Ken, are there any stds that demand a perfect surface, e.g. any IPC standards. And what use to cause outgassing issues? I have several PWB courses behind, but many, many years ago. Can dig in my piles, but a faster answer from TN seems a bit more comfortable. /Inge ----- Original Message ----- From: "Ken Bloomquist" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, August 24, 2009 11:20 PM Subject: Re: [TN] Manual spraying, further qs > The bad board had beans for lunch, "bad out gassing problem"! :-) > > KennyB > > -----Original Message----- > From: Inge [mailto:[log in to unmask]] > Sent: Monday, August 24, 2009 1:50 PM > To: [log in to unmask] > Subject: Re: [TN] Manual spraying, further qs > > This very day, I couldn't stay aside but had to do something to help the > production guys. So, I took a fresh, naked and qualified board from > another > source and did this: > Put one of our problem boards beside the reference board, both on bottom > of > a larg well box, i.e. no fans blowing, nor any evacuation. Sprayed both > simultaneosly. Inspected them after one hour at room temp. The reference > board was absolutely perfect, while the other was matte! Had a look in a > microscope. The bad guy had thousands of microscopic inclusions and even > superficial voids, the reference was perfect. Noticed that the bad boards > have a much coarser (looks like the net pattern after screen > printing)green > sheet (solder mask) and numerous voids already before spraying. What is > your > > opinion? > /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 ----------------------------------------------------- . Der Inhalt dieser E-Mail ist für den Absender rechtlich nicht verbindlich. Informieren Sie uns bitte, wenn Sie diese E-Mail fälschlicherweise erhalten haben (Fax: +49-7551-891-4001). Bitte löschen Sie in diesem Fall die Nachricht. Jede Form der weiteren Benutzung ist untersagt. . The content of this e-mail is not legally binding upon the sender. If this e-mail was transmitted to you by error, then please inform us accordingly (Fax: +49-7551-891-4001). In such case you are requested to erase the message. Any use of such e-mail message is strictly prohibited.