Chris,

Thanks for the reply that sounds interesting. Do you have a pointer to
this manufacturer?

Regards,
Emanuel

---
MPL AG                                   www.mpl.ch
Emanuel Zimmermann       [log in to unmask]
Manager R&D                       Phone: +41 56 483'34'34
Taefernstrasse 20               Fax:      +41 56 493'30'20

CH-5405 Daettwil
---

Leadfree <[log in to unmask]> wrote on 09.11.2005 09:57:54:

> At least one mfr is already making a green coloured LF paste as you
> describe.
>
> Regards,
> Chris
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf Of Emanuel Zimmermann
> Sent: 09 November 2005 08:13
> To: [log in to unmask]
> Subject: [LF] Avoiding Solder Paste Mixup
>
> Hello Experts,
>
> I'm monitoring this forum for a while now and thankfully could learn a
> lot
> of your expertise.  Since I can't claim beeing expert myself in this
> arena
> my return is much less.
> We just ran into the issue that our assembly house mixed up solder
> pastes
> and soldered lead containing BGA's with LF paste. Despite the assembly
> house assured that they have used Sn/Pb paste I could show that the
> solder
> joints are LF (with the help of lead test sticks I first heard of in
> this
> forum).
> This made me think for a method how it may be possible to distinguish
> between LF and lead containing pastes easily already in the printing
> phase
> of the paste to the PCB. Has anybody of you spent any thoughts about
> this?
> What came to my mind was that maybe LF pastes could have some adds that
> let them appear in a color, green for example, instead of the metallic
> grey. These adds may can evaporate during reflow or even better remain
> in
> the solder to have colored joints on LF boards and metallic grey joints
> on
> Sn/Pb boards. Would this be an option?
>
> Thanks for your thoughts,
> Emanuel
>
> ---
> MPL AG                                   www.mpl.ch
> Emanuel Zimmermann       [log in to unmask]
> Manager R&D                       Phone: +41 56 483'34'34
> Taefernstrasse 20               Fax:      +41 56 493'30'20
>
> CH-5405 Daettwil
> ---
>
> ------------------------------------------------------------------------
> -------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 message (including any attachments) may contain confidential
> information intended for a specific individual and purpose.  If you are
> not the intended recipient, delete this message.  If you are not the
> intended recipient, disclosing, copying, distributing, or taking any
> action based on this message is strictly prohibited.
>
>
>
-------------------------------------------------------------------------------
> 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]
> org 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
-------------------------------------------------------------------------------