Dear LW Foo
ISO 9453 was published in 1990 by the International Organisation for
Standardisation. It deals with soft solder alloys, chemical compositions
and forms.
Curently listed forms of solder are; ingot, slab, bar, stick, rod, wire,
pellets, preforms and powder. Spheres are not specifically listed, only
because the standard is over 10 years old. They will be added during the
current review process which will also add SnAgCu and other lead-free
alloys.
Kay
+++++ Visit our lead-free.org website +++++
Soldertec at Tin Technology Ltd, Kingston Lane,
Uxbridge, Middx, UK, UB8 3PJ
tel: +44 (0)1895 272406 fax: +44 (0)1895 251841
[log in to unmask] and www.lead-free.org
-----Original Message-----
From: LW Foo (A_Engineering) [mailto:[log in to unmask]]
Sent: 31 May 2001 03:11
To: [log in to unmask]
Subject: Re: [LF] Lead-free tolerances
Hi Keach, I 'm LW Foo
Currently work on Lead free solder "spheres" , would it standard apply
to
solder spheres?
Currently what I 'm working on is SnAgCu alloy, would appreciated pls
advise..
Thanks & Regards
L.W.Foo
Engineer - Advanced Technology
Foo Loke Whong
Carsem Semiconductor Sdn Bhd
Email id : [log in to unmask]
Phone : +(6 05) 5262333 Ext : 530
Fax : +(6 05) 5265333
> ----------
> From: Keach Sasamori[SMTP:[log in to unmask]]
> Reply To: Leadfree Electronics Assembly E-Mail Forum.;Keach
Sasamori
> Sent: Wednesday, May 30, 2001 10:13 PM
> To: [log in to unmask]
> Subject: [LF] Lead-free tolerances
>
> Posting for Kay Nimmo:
>
> From: "Kay Nimmo" <[log in to unmask]>
> To: "Leadfree Electronics Assembly E-Mail Forum." <[log in to unmask]>
>
> The ISO 9453 standard defines specific composition ranges for each
alloy
> rather than general tolerances; e.g.
>
> Sn-5Sb can have 4.5 to 5.5%Sb
> Sn-4Ag can have 3.5 to 4.0%Ag
> Sn-1Cu can have 0.45 to 0.9%Cu
>
> I imagine these composition ranges were set to limit significant
changes
> to liquidus/solidus. Newer lead-free alloys are in the process of
being
> added to the standard.
>
> Kay Nimmo
>
>
> -----Original Message-----
> From: Lynn Norman [mailto:[log in to unmask]]
> Sent: 29 May 2001 17:03
> To: [log in to unmask]
> Subject: [LF] Lead-free tolerances
>
>
> We're starting our in-house evaluation of lead-free solder. The
> composition
> we are initially looking at is 95.5Sn-3.8Ag-0.7Cu. Our current spec
for
> SnPb has a +/- tolerance of 0.5% on the composition. What kind of
> tolerance
> will the lead-frees have? How much of an effect will the variability
> have
> on solidus/liquidus temperatures? Just curious as to what others are
> doing.
>
>
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>
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Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
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Leadfee Mail List provided as a free 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 delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
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