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Which type of lead-free solder is the best?
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newbrain:

--- Quote from: perieanuo on August 18, 2020, 10:58:53 am ---I haven't see any lead-free that beats 60/40.

--- End quote ---
And 63/37 shreds both!  ;)
Psi:
Best lead free solder is mislabeled leaded solder  :-DD
peter-h:
The proof of the pudding (an English idiom) is that 60/40 etc is still widely sold e.g.

https://www.rapidonline.com/rapid-solder-wire-60-40-22swg-0-7mm-500g-reel-85-0595

When ROHS came in, the price rocketed, presumably because everybody was stocking up with it ;) It went from £5 to over £20 / 500g, very fast. Making money out of compliance is the world's second oldest profession.

Unleaded SMT soldering was originally a huge issue for capacitors, due to the higher soldering temperatures. Electrolytics from the biggest quality names e.g. Nichicon would "inflate" from the gases liberated. This would have triggered the scrapping of a lot of component stock. The general quality never reached the perfect wetting one got with leaded solder, but it works well enough for nobody to bother anymore.
Bassman59:

--- Quote from: peter-h on August 18, 2020, 09:10:58 am ---The whole ROHS thing is pointless because lead from other sources (e.g. car batteries) is vastly bigger than lead getting into the environment from electronics.
--- End quote ---

It's not pointless.

Car batteries are pretty much always recycled. When you buy a new battery here in the colonies, the seller takes your old battery and deals with the recycling. There's a lot of lead in them and it's valuable. Sure, you have jackasses who don't trade in the batteries, but then the seller adds a "core charge" to the price of a new battery if there is no trade-in.

Consumer electronics are something else entirely. When a gizmo dies, most people just toss it into the trash, and the trash gets hauled off to a landfill. And the problem is that the lead and other heavy metals were leaching into the water supply from landfills.

Think about how many electronic things you have in your house, and then multiply that by all of the homes in your city. That's a LOTTA e-waste.
tooki:
Except that the numbers used for calculating the lead in electronics was based on the numbers including CRT glass, which contains several kilos of lead per tube! But by the time RoHS took effect, CRTs had already gone the way of the dodo, leaving only a few grams of lead in a device, at most.

And meanwhile, literally TONS of lead continues to go into the environment in lead bullets from hunting and target practice.

So yes, RoHS’s lead restriction is entirely pointless in the context of electronics.
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