Subject: | |
From: | |
Reply To: | (Leadfree Electronics Assembly Forum) |
Date: | Wed, 9 Nov 2005 10:31:42 +0100 |
Content-Type: | text/plain |
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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
> ---
>
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