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psiegel(at)fuse.net Guest
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Posted: Sat Sep 01, 2007 1:23 am Post subject: Lead-free soldering? |
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Since going green is all the rage these days, what is the latest on going lead-free when soldering aircraft wiring?
Any actual data on advantages/disadvantages of going to Sn97 Ag2.5 Cu.5 solder instead of our traditional Pb63 Sn37 solder?
What's the bottom line?
Paul Siegel
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cjensen(at)dts9000.com Guest
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Posted: Sat Sep 01, 2007 3:16 am Post subject: Lead-free soldering? |
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The bottom line is you'll do more for the enviroment by not driving down
to radioshack in your SUV to pick up the silver solder then switching to
leadless solder (particularly so if you through the spool of lead solder
in the garbage. However, if it makes you feel good, and others confirm
that its technically equivalent, then by all means.
Chuck
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bobf(at)feldtman.com Guest
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Posted: Sat Sep 01, 2007 4:28 am Post subject: Lead-free soldering? |
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Hams have used solder for years. The only disease that spikes some in hams is lymphoma; but is that from the lead? or the resin? or the RF we sit in in our radio shacks? Who knows. I wouldn't chew on a piece of solder as you are working for sure. Probably not a good idea to enjoy inhaling the smell of solder, but there are probably a bigger dose of carcinogens in the "new car smell" you get in your new car as plastics off gas formaldehyde and all sorts of other nasty aldehydes and orgai=nic materials. Every time I fly my Glastar I smell the plastic smell a lot sitting in the fiberglass fuselage. I still fly! and don't worry about it.
I wouldn't let your grandbabies play with the solder, but we buy toys made in China all the time! painted with lead we are finding out.
bobf
W5RF
On 9/1/07, psiegel(at)fuse.net (psiegel(at)fuse.net) <psiegel(at)fuse.net (psiegel(at)fuse.net)> wrote:[quote] --> AeroElectric-List message posted by: <psiegel(at)fuse.net (psiegel(at)fuse.net)>
Since going green is all the rage these days, what is the latest on going lead-free when soldering aircraft wiring?
[b]
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simon(at)synchronousdesig Guest
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Posted: Sat Sep 01, 2007 7:02 am Post subject: Lead-free soldering? |
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Paul,
The rage to use less lead came from the European Union in a directive called
"the restriction of the use of certain hazardous substances in electrical
and electronic equipment, commonly called RoHS (Restriction of Hazardous
Substances). Article 4 Prevention, Paragraph 1 says "...new electrical and
electronic equipment put on the market does not contain lead, mercury,
cadmium, hexavalent chromium, polybrominated biphenyls (PBB) or
polybrominated diphenyl ethers (PBDE)."
Since the European Union is a large market and also has many electrical and
electronic vendors, RoHS affects the USA and other countries. RoHS has
caused a lot of problems here, mostly because they do not mix well with
leaded parts on electronic circuit boards. The temperatures and oven
profiles to make populated boards are different, and mixing of the two types
of components causes some solder joints to be deficient and out of spec,
thus decreasing reliability and causing anomalies that require further
troubleshooting and possible redesign. The end result of all this is to go
either all leaded parts or all RoHS parts on boards, which was hard to do
earlier but getting easier. Manufacturers in the USA and other non-European
countries have been forced to adopt the RoHS directive even when they're
manufacturing and selling only in the USA, because non-RoHS parts are
getting harder to come by. There are exceptions to RoHS, like military
equipment, but even the military is hard-pressed to go with leaded parts.
Many simply don't exist anymore.
As such, defense contractors have qualified lead-free finishes and soldering
and are making military equipment with no lead. There has been a learning
curve, and even when everyone thinks they have everything under control,
something always comes back to bite them. Nonetheless, defense contractors
make equipment with lead free components and solder, and there is no reason
to suspect that lead-free solder is unreliable or less reliable if the
operation is done properly. There are many resources that can be found on
the internet to help you do this. One that comes to mind is by Dynamix
Technology at the following link:
http://www.dynamixtechnology.com/pbwillis.htm
There you can find their offering of an interactive CD-ROM about Soldertec
hand soldering and de-soldering lead-free. If anyone needs the actual EU
Directive on RoHS, I will be more than glad to send them a PDF.
Simon Ramirez, Aerocanard Builder
LEZ N-44LZ
Oviedo, FL 32765 USA
Copyright C 2007
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AV8ORJWC
Joined: 13 Jul 2006 Posts: 1149 Location: Aurora, Oregon "Home of VANS"
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Posted: Sat Sep 01, 2007 7:33 am Post subject: Lead-free soldering? |
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Simon - thanks for the great post.
John Cox
RV-10 builder
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