Kari, Per-Erik and others
Process Characterisation Testing may now be achieved by the use of new SIR
test protocols.
In 2004, we expect to publish IEC-61189-5. I am hopeful that there will be a
new IPC spec running concurrent.
If you or anyone else would like a draft of this spec., then please let me
know
--
Regards Graham Naisbitt
[log in to unmask]
Cell: 079 6858 2121
Office: +44 (0)1252 813706
Concoat Limited - Engineering Reliability in Electronics
Web: www.concoat.co.uk and www.concoatsystems.com
> Kari,
>
> I'm afraid I don't have the time to expound on how to qualify the
> manufacturing process, but I do recommend that you get a copy of IPC-HDBK-830,
> "Guidelines for Design, Selection and Application of Conformal Coatings". You
> can find much valuable information in that guideline.
>
> Per-Erik Tegehall
>
> -----Ursprungligt meddelande-----
> Från: Kari Rambo [mailto:[log in to unmask]]
> Skickat: den 11 september 2003 16:12
> Till: 'TechNet E-Mail Forum.'; Tegehall Per-Erik
> Ämne: RE: [TN] Silicone conformal coating
>
>
> Per-Erik,
>
> Any amount of information you would care to share regarding qualification of
> the manufacturing process for conformal coating would be greatly
> appreciated.
>
> Kari Rambo
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Tegehall Per-Erik
> Sent: Thursday, September 11, 2003 6:16 AM
> To: [log in to unmask]
> Subject: Re: [TN] Silicone conformal coating
>
> David,
>
> Visual requirements are not very useful for this purpose since you cannot
> inspect beneath area array components and even when you have leaded
> components you cannot incpect the backside of the leads. Furthermore,
> "openings" my also form if field environments for example by blistering and
> cracking of the coating. Therefore, in my opinion, you need to do some sort
> of experimental verification that will show you that the coating gives
> adequate protection during the expected life. That is difficut to do on a
> product that will be sold to a customer. Thus, you should focus on
> qualifying the manufacturing process rather than the finished product.
>
> How should you then do that? That is another question that would require a
> very long answer.
>
> Per-Erik
>
> -----Ursprungligt meddelande-----
> Från: David Douthit [mailto:[log in to unmask]]
> Skickat: den 10 september 2003 15:08
> Till: TechNet E-Mail Forum.; Tegehall Per-Erik
> Ämne: Re: [TN] Silicone conformal coating
>
>
> Per-Erik,
>
> "(as long as you don't have opens in the coating)" This raises an
> interesting question. Just exactly how
> do you determine if there are "openings" (microscopic pinholes and/or
> inadequate coverage of sharp edges and points)?
>
> Then, if you do determine there are, what is done about it?
>
> David A. Douthit
> Manager
> LoCan LLC
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> 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
> 847-509-9700 ext.5315
> -----------------------------------------------------
>
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 847-509-9700 ext.5315
-----------------------------------------------------
|
