1/8" are always more difficult to work with.
Regardless of solder, there are vast differences in through-hole
plating adhesion between different board manufacturers (and possibly
batches).
I believe it has to do with de-smear (where the epoxy is etched out of
the hole to expose some glass fibers) and possibly the hole activation
and plating itself.
Sure, the process window narrows with lead-free. It requires better
tools and more skill to rework without damage.
You are most probably right, leadfree solder will not nearly have the
benefit of unleaded gasoline, simply because lead in fuel was so much
worse.
For unleaded gasoline we still don't know the full picture, for
example only now after many years we see clear statistical links
between a marked reduction in crime and the phasing out of leaded
gasoline.
ST
On Sat, Jul 19, 2014 at 3:25 AM, Brad Thompson
brad.thompson@... [Homebrew_PCBs]
<
Homebrew_PCBs@yahoogroups.com> wrote:
> Hello--
>
> At a recycling center where I volunteered, a manufacturer dropped off
> several gaylords full of electronic scrap, including a batch of thick (1/8")
> circuit boards assembled with lead-free solder. The boards had failed
> final test and were discarded because they couldn't be reworked due
> to through-hole pullout. I found that while I could salvage individual
> components, I invariably ruined the board, and I suspect that factory techs
> had the same experience.
>
> If the intent behind adoption of RoHS was the reduction of electronic
> waste, I wonder
> how much of the waste stream now consists of unrepairable lead-free-soldered
> products?
>
> Getting the lead out of gasoline likely made much more of a difference
> in the overall
> lead burden than removal of lead from solder.
>
> 73--
>
> Brad AA1IP
>
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