You may wish to contact Alan Brewin at NPL in the UK who may have some info
on mixing chemistries ( not listed on there web site though) We have used
them for consultancy on RoHs.
www.npl.co.uk
-----Original Message-----
From: Blair K. Hogg [mailto:[log in to unmask]]
Sent: 17 March 2005 01:15
To: [log in to unmask]
Subject: Re: [LF] soldering SnPb components with lead free solder
Dennis,
I would like to see the articles that you have concerning Pb contamination
in LF solder joints.
Also, from what I understand of using LF components in a SnPb process, that
the main issue is getting the LF platings to wet properly, which may need
higher temperatures.
Blair
>>> [log in to unmask] 03/16/05 07:31PM >>>
I understand there's also reliability issues with Pb Contamination in solder
joints when using Lead Free Solders.
Basically the Pb results in a 179C Eutectic alloy SnPbAg. This concentrates
itself at the last point to cool and results in small pockets. It is
interesting to note that Pb contamination of 2-5% is detrimental to the
joint but contamination of 10-15% reliability increases again. I have a few
articles talking about this. Please contact me offline if you wish a copy.
On a slightly different note, is lead free components compatible with a Lead
Process. I understand that it should be with SMT apart but how's does it
affect Pb Wave Soldering? Increase in Cu contamination?
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Smith, Rick
Sent: Thursday, 17 March 2005 7:54 AM
To: [log in to unmask]
Subject: Re: [LF] soldering SnPb components with lead free solder
Sure, it will be ok as long as you aren't expecting the visual
appearance to be equivalent to LF.
You will probably get better looking solder joints depending on how much
lead.
Only issue is wave solder, where if you have already cleaned the pot,
you will introduce Pb as a contaminant.
Rick Smith
Senior Product/ Component Engineer
ClearCube Technology
8834 Capital of Texas Highway North
Austin, TX 78759
Phone: (512)652-3544
Cell: (512)299-6925
Fax: (512)652-3545
[log in to unmask]
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Larry Koens
Sent: Wednesday, March 16, 2005 8:33 AM
To: [log in to unmask]
Subject: [LF] soldering SnPb components with lead free solder
Leadfree netters,
I have a customer who wants us to build a board to help him validate
lead free. He has a partial mix of components (some are lead free,
others are SnPb). Would it be ok to solder the SnPb components using
lead free solder? I know and understand the product will not be RoHS
compliant, but this is for internal study and not to be marketed.
thanks,
Larry
------------------------------------------------------------------------
-------Leadfee Mail List provided as a service by IPC using LISTSERV
1.8d
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks
send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
------------------------------------------------------------------------
-------
----------------------------------------------------------------------------
---Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
----------------------------------------------------------------------------
---
#################################################
***** CONFIDENTIAL *****
We apologise if this message has been sent to you in error. We are
committed to protecting the confidential information of our customers,
our vendors and GPC Electronics. If you have received this message in
error, we would appreciate you removing it from your system and
informing us of the error, so that we may continue to improve our
processes.
Please note that whilst we check our outgoing mail, you should also
check any attachments for viruses and defects before opening them or
sending them on.
Thank you.
#################################################
----------------------------------------------------------------------------
---Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
----------------------------------------------------------------------------
---
*******************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.
This footnote also confirms that this email message has been swept
for the presence of computer viruses.
www.hubbell.com - Hubbell Incorporated
----------------------------------------------------------------------------
---Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
----------------------------------------------------------------------------
---
-------------------------------------------------------------------------------Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
-------------------------------------------------------------------------------
|
