David,
Your decimal point is off. It is going to be either 0.2% or 0.1%.
And although we might wish it would that simple, it most likely will not.
regards,
Bev Christian
Research in Motion
-----Original Message-----
From: Dave Chapman [mailto:[log in to unmask]]
Sent: October 23, 2003 8:39 AM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] How to estimate the amount of lead in a
PCB-Ass embly ?
I have heard several times from different people jokingly or maybe not that
since the requirement seems to be based on an allowable 2% lead by weight
(US proposal) to still be considered lead free, that many assemblies could
have heavy heatsinks or other weights added thereby reducing the percentage
by weight of the lead in the assembly. I hope somehow that is worked out by
that committee.
Dave C.
-----Original Message-----
From: Ofer Cohen [mailto:[log in to unmask]]
Sent: Friday, October 17, 2003 10:51 AM
To: [log in to unmask]
Subject: [TN] FW: [TN] How to estimate the amount of lead in a
PCB-Assembly ?
Sorry for the late response - just returned from a vacation and trying to
find myself between over a hundred mails.
However, there is a group in IPC working on definition of a calculation and
declaration methods of hazardous materials contained in electronic products.
The group leader is [log in to unmask]
> > ----- Original Message -----
> > From: "Mike Fenner" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Tuesday, October 14, 2003 12:01 PM
> > Subject: Re: [TN] How to estimate the amount of lead in a
> PCB-Assembly ?
> >
> >
> > > I think the problem is that knowing how much Pb is where
> doesn't really
> > > give a route map to its elimination, so nobody has
> thought in this way.
> > > The usual suggested route, in outline, is:
> > >
> > > 1) Change board finish to eliminate Pb (example: from
> HASL to Ag or OSP
> > > etc)
> > > 2) Wait for component people to bring out lead free and lead free
> > > (temperature) rated devices
> > > 3) Change the paste/solder.
> > >
> > > In parallel/off line
> > > 4) Audit component suppliers for Pb-free availability
> dates types etc.
> > > 5) Pb-free paste/solder can be used now to evaluate approve types,
> > > explore production parameters, gain experience, verify
> reliability and
> > > so on.
> > >
> > > This way ensures compatibility and gives a "change one
> thing at a time"
> > > path. 1) and 2) are to your specification, but most people have no
> > > control over 2, and availability of components is the
> real decider on
> > > switching.
> > >
> > > Regards
> > >
> > > Mike Fenner
> > >
> > > Indium Corporation
> > > T: + 44 1908 580 400
> > > M: + 44 7810 526 317
> > > F: + 44 1908 580 411
> > > E: [log in to unmask]
> > > W: www.indium.com
> > > Pb-free: www.Pb-Free.com
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: TechNet [mailto:[log in to unmask]] On Behalf Of d. terstegge
> > > Sent: Monday, October 13, 2003 10:31 AM
> > > To: [log in to unmask]
> > > Subject: [TN] How to estimate the amount of lead in a
> PCB-Assembly ?
> > >
> > >
> > > Hi Technet,
> > >
> > > I posted this same message to the LeadFree forum last
> week, but didn't
> > > receive any usefull answers (except a mentioning of the
> availabliity of
> > > Pulverization & Analytical Techniques), so I try again here :
> > >
> > > I just received a question from one of our customers,
> asking how much
> > > lead their products contain. The answer will help them to
> make decisions
> > > about changes to their (future) boarddesigns. This seems
> not so easy to
> > > answer, as lead is introduced in the product as HASL, as
> solderpaste, as
> > > wave soldered joints and as finishing of component
> terminations. I don't
> > > want to reinvent the wheel, therefore I'm looking for
> recommendations on
> > > a practical approach to deal with this question, that I'm
> sure many of
> > > you have had before. All input is appreciated.
> > >
> > > Daan Terstegge
> > > Thales Communications
> > > Unclassified mail
> > > Personal Website: http://www.smtinfo.net
> > >
> > >
> >
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