Good response - this is the first time I have seen a dissenter speak his mind.
Much more of this needs to occur and maybe the scientific community can get the
point across to the marketing community that there is nothing wrong with
continuing to use tin-lead solder.
The consumer needs to be educated as to the environmental damage that many of
the alternatives pose.  This in many cases far exceed any damage the tin-lead
solder has done; is doing; or will do in the future.  The recycling issue will
be there whether or not tin-lead is continued to be used.  We could be better
served by developing recycling methods to recover the tin-lead and capture the
PWBs before they get to landfills than we currently are trying to find an
alternative solder for a process which is likely to be replaced with better
technology in the next ten years.




"Davy, Gordon" <[log in to unmask]> on 11/01/2000 04:06:55 PM

Please respond to "Leadfree Electronics Assembly E-Mail Forum."
      <[log in to unmask]>; Please respond to "Davy, Gordon"
      <[log in to unmask]>

To:   [log in to unmask]
cc:    (bcc: Jerry L. Schwab/AT-Austin/3M/US)
Subject:  Re: [LF] Standard Method for Solderability Testing



Charlie:

In response to your question "Are the temperature listed in J-STD-002 going
to be raised to reflect the higher temperatures for lead-free? If so what
will they be raised to?" - That has yet to be worked out. This is going to
take some time, but it certainly seems likely that it will have to be
increased some if SnAgCu or SnCu is to be used.

In response to your question about preconditioning of PEMs before
reliability testing by solder immersion instead of reflow, I don't know, but
I suspect that Jack McCullen of Intel ([log in to unmask], (480)
554-5354) would know. Jack is the EIA representative for J-STD-020 on
setting moisture-sensitivity levels.

In response to your question about the effect of higher reflow temperature
on moisture sensitivity level, it has been estimated that a 10 degree rise
in reflow temperature causes a 2-level increase in MSL.

At the risk of offending some, I can't resist commenting again that while it
was a good thing to remove lead from gasoline and paint, removing it from
electronic hardware is not a good thing. How sad it is that all this work is
being done to solve a non-problem. When it is finally all sorted out and
scientists and engineers have determined how to get along (sort of) without
lead, people's quality of life will not as a result have improved at all, no
lives will have been saved, and any temporary market share advantage of
being lead-free will have vanished. What a waste, just to avoid appearing to
the zealots as "environmentally irresponsible" and to meet the (real or
imagined) pent-up market demand for "green"! I can think of a lot of better
ways of spending all that money and effort. (One would be exposing the
sham.) I can't imagine what it must feel like for the participants of this
forum who have been assigned to work on such a project. I am upset with the
irresponsible people who crusaded for lead-free electronics in Europe and
Japan; they should be ashamed of themselves. I wonder what they'll come up
with next.
>
        Gordon Davy
        (I'm not showing my affiliation because I've taken the liberty of
expressing my opinion)

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