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Re: lead free solder again


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It was at maximum width before ROHS. That didn't work, too much
lead in undesireable places. The minimum width is 0, which is not
yet practical -> exemptions.

Perhaps Swatch can start making mechanical watches, if they can't
solve what others have solved in a heartbeat.

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Thanks, Frank.
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Re: lead free solder again


[...]
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.... but did that lead come from the little bit thats in solder or was it
from all that lead paint that was being scraped and the gasoline etc?


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Re: lead free solder again



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   Metal whiskers are very crystalline, and are hundreds if not
thousands times stronger than even pure metal sheet or rod.

Re: lead free solder again



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This is all very interesting and stuff, but has anybody ever actually
made tin whiskers "on purpose", to maybe study them?

Thanks,
Rich


Re: lead free solder again




Rich Grise wrote:

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You don't need to. They just spring up anyway .

Graham


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   It is summer time...

Re: lead free solder again



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   Perhaps ypu did not *read* the conclusions: No matter what anybody
did, as long as tin was persent, the results were highly variable from
no tin whiskers to numerous tin whiskers.
   They have even been seen in electronic solder...

Re: lead free solder again


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in

They are also hundreds if not thousand times thinner than pure
metal sheet or rod. Probably softer than the hairs on your wife's
arm ;)

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Re: lead free solder again




Frank Bemelman wrote:

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Have you ever seen what hairs can grow through ?

Graham


Re: lead free solder again


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Eh, guess not. Any particular place I should look for?

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Re: lead free solder again



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   "softness" has nothing to do with strength.

Re: lead free solder again


On Thu, 13 Jul 2006 02:44:25 GMT,

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What makes you think so? Single-crystal metals are much softer than
their multicrystalline forms -- that's the mechanism of work-hardening.

robert

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   i repeat, "softness" has *nothing* to do with strength.

Re: lead free solder again


On Fri, 14 Jul 2006 07:46:48 GMT,
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So, in which sense do you think metal whiskers are "stronger" than pure
metal sheet or rod?

robert

Re: lead free solder again



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   Mostly in compression, so as it grows, it can puncture almost anything.

Re: lead free solder again



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** Maybe and maybe not.  Results are highly variable.
   Try something and i might work and someone else might have problems.
   Absolutely guaranteed to be variable.

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Re: lead free solder again


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So, does lead-free solder have this problem too ? How bad is it ? Do you
have studies, pictures, etc ?

vic

Re: lead free solder again




vic wrote:

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Too ? It is lead-free issues we're talking about !

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Just Google ! There are any number of problems with lead-free soldering notably,
in the consumer domain, reduced product lifetime resulting in more waste
generation.

Graham


Re: lead free solder again



snipped-for-privacy@gmail.com wrote:
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Michael,
(Slightly OT) It seems silly to spend so many resourses on ROHS with
respect to solder, when recycling would be a more sensible (and much
safer, as far as avionics is concerned) alternative.  Think of all the
lead-acid automobile batteries that are in use.  This lead is kept out
of the environment via recycling.
Regards,
Jon


Re: lead free solder again


[....]
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No, the lead in car batteries is not "kept out of the environment".  Only
majority of it gets recycled.  There is still some leakage into the
environment.

The recycling is done basically like this:

(1)
Ship the batteries to some 3rd world country.

(2)
Pull the plugs and drain the acid on the dirt.

(3)
Make a big pile of them and cover them with gasoline and throw a match at
them.

(4)
After the plastic and spacers have all burned away put whats left into a
big pot.

(5)
Cut down some rain forest to make fire wood to heat said pot.

(6)
Have the women and children scrape all the junk the rises to the top off.

(7)
Pour the melt in to molds

(8)
Ship the recycled lead to the battery factory.

(9)
Tell people "it recycled so its ok"

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