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.
|
