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Old June 5th 08, 07:32 AM posted to rec.radio.amateur.homebrew
Highland Ham Highland Ham is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 250
Default Lead free solder , was : REMOVING ENAMEL COATING

The EU has regs that are essentially outlawing lead solder in
electronics. Because the EU is such a big market, most electronics
makers are following along, and rather than deal with both lead and no-
lead solders, they're going all-no-lead. With all the problems lead-
free electronic solders bring along.

But IMHO the whole thing is wrong-headed. Lead in the environment is a
problem, but the solution is recycling, not banning lead.

How ironic is it that a major rework of a car's electronics will be
done to eliminate a few ounces of lead-tin solder, while the car's
battery contains many pounds of lead and acid?

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Indeed ,lead free solder does not flow that well even at elevated
temperatures ,
so I have stocked up on leaded solder (possibly sufficiently for the
rest of my home brewing life).

But the point is that electronic equipment having printed circuit boards
contain a very low percentage (weight wise) of solder. If that solder
contains lead any recycling effort to recover/isolate the lead will be
exceedingly costly. In the past printed circuit boards were pulverised
to recover the gold on 'contact fingers' through a chemical process ,
but apparently that is no longer viable.

So although there is very little lead in electronic equipment
manufactured with 60/40 or 63/37 leaded solder ,when equipment ends up
in a land fill the cumulative effect is bad ,poisoning ground water.

So it does make sense to go for lead free solder.

BTW : In the UK leaded solder is still available ,although no longer
from High Street retail outlets like Maplin Electronics .

Lead Acid Batteries have a large percentage of lead (weight wise) ,hence
recycling is commercially viable .


Frank GM0CSZ / KN6WH