[tinwhiskers] Re: Exemption on high temperature lead solder
- From: "Parnagian, Ed" <ed.parnagian@xxxxxxxxxxx>
- To: "tinwhiskers@xxxxxxxxxxxxx" <tinwhiskers@xxxxxxxxxxxxx>
- Date: Tue, 26 Aug 2008 15:14:22 +0200
Hi, Nikki!
Sorry, but my email app sorts from most recent down, so didn't notice that you
were the originator of these questions. So here is my perspective. And yes,
it seems inconsistent with the stated objectives of RoHS, but it is a good
example of what pushing back with data can achieve.
These high lead-content solders all have very high melting points. They are
used by device manufacturers to make internal interconnects in devices that
have very high power densities.
The small amount of mercury in flouresent lights is part of the internal
coating on the glass. And the fact that these tubes won't emit an acceptable
spectrum of light without the mercury. Combine that with the prospect of
replacing all those flouresents with incandesents would consume even more
electricity. And by the way, those tubes ought to be treated as hazardous
waste and turned into the local municipality as such, not put in the weekly
trash. My town won't knowingly pick them up.
Best regards,
Ed
-----Original Message-----
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Niki Steenkamp
Sent: 2008 Aug 26 8:24 AM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: [tinwhiskers] Exemption on high temperature lead solder
Hi,
I have been looking over some of the official RoHS documents and have seen
that there is an exemption on high temperature lead solder (more than 85%
lead). Not having done any more research on the subject I was wondering:
* Why the exemption exists?
* Why not use more than 85% lead to circumvent the pure tin problem? Maybe
the temperature is unacceptably high?
I also noticed that mercury is limited but not banned in fluorescent lights.
Just thinking of the millions of fluorescent lights being dumped in landfills
each year I cannot see how this can be viewed as acceptable while ALL lead
had to be removed from electronics. Furthermore, lead in batteries are
exempt. There is probably more lead in my car battery than in a thousand PC
motherboards and how many of these batteries end up in landfills each year?
Just seems strangely warped...
Regards,
Niki
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