LEADFREE Archives

December 1999

Leadfree@IPC.ORG
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Subject:
Re: Leadfree paste formulation and printing
From:
David Suraski - AIM <[log in to unmask]>
Reply To:
Leadfree Electronics Assembly E-Mail Forum.
Date:
Tue, 14 Dec 1999 08:09:55 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (117 lines) 
Hello (again!),

I have just returned from a "field trip", in which CASTIN (Sn/Ag/Cu/Sb)
solder paste (made with some of our current no clean flux formulations) was
reflowed and then put through various cleaning tests.  The results: in
nearly every case, the CASTIN paste cleaned as well as tin/lead paste had
cleaned during previous experimentations.  There were some minor exceptions,
but a slight adjustment to the cleaning equipment settings and/or the
concentration of the cleaners used resolved these issues completely.  I
cannot speak for other solder vendors, but I assume that their results would
be very similar with the same or similar alloys.

(And sorry for using the term "CASTIN"- but what can I say, that's what was
tested)

Best regards,

David
----- Original Message -----
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 14, 1999 7:56 AM
Subject: Re: [LF] Leadfree paste formulation and printing


> Hi!
>
> 2 points: Bi alloys do not work well with "usual" fluxes. Cu/Ag-containig
alloys cook
> the flux residues more, making them hellishly difficult to clean.
>
> Brian
>
> tn wrote:
>
> > Hi Netters,
> >
> > I would like to congratulate the founder of this forum.
> >
> > What are the development issues that are crucial for formulating flux
> > medium for Pb-free solders? Would a direct translation of flux
> > mediums of Pb-rich to Pb-free solders be advantageous or detrimental,
> > and why?
> >
> > Regards
> > Dr. Tennyson Nguty, Electronics Manufacturing Research Group,
> > AeroMech Department, Newton Building, Salford University
> > Manchester M5 4WT, UK. Tel: 0161-295 5951/4696, Fax: 0161-295 5575/5108
> > Email: [log in to unmask]
> > >> If you want to make your dreams come true, wake up!
> >
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> > IPCWorks -October 25-28 featuring an International Summit on Lead-Free
Electronic
> > Assemblies.
> > Please visit IPC's Center for Lead-Free Electronics Assembly
> > (http://www.leadfree.org ) for additional information.
> > For technical support contact Gayatri Sardeshpande [log in to unmask] or
847-790-5365.
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>
>
>
> --
> Brian Ellis
> Protonique SA
> PO Box 78
> CH-1032 Romanel-sur-Lausanne, Switzerland
> Voice: +41 21-648 23 34 Fax: +41 21-648 24 11
> E-mail: [log in to unmask]
> URL: Technical and consultancy divisions:
>        http://www.protonique.com
>      Web services division:
>        http://www.protonique.com/webserv
>
> ################################################################
> Leadfree E-Mail Forum provided as a free service by IPC using LISTSERV
1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask]
> with following text in the body:
> To subscribe:   SUBSCRIBE Leadfree <your full name>
> To unsubscribe:   SIGNOFF Leadfree
> ################################################################
> IPCWorks -October 25-28 featuring an International Summit on Lead-Free
Electronic
> Assemblies.
> Please visit IPC's Center for Lead-Free Electronics Assembly
> (http://www.leadfree.org ) for additional information.
> For technical support contact Gayatri Sardeshpande [log in to unmask] or
847-790-5365.
> ################################################################
>

################################################################
Leadfree E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask]
with following text in the body:
To subscribe:   SUBSCRIBE Leadfree <your full name>
To unsubscribe:   SIGNOFF Leadfree
################################################################
IPCWorks -October 25-28 featuring an International Summit on Lead-Free Electronic
Assemblies.
Please visit IPC's Center for Lead-Free Electronics Assembly
(http://www.leadfree.org ) for additional information.
For technical support contact Gayatri Sardeshpande [log in to unmask] or 847-790-5365.
################################################################

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