[sdiy] Transition to Lead-Free Hand Soldering

dh at atoav.com dh at atoav.com
Sat Aug 21 13:09:46 CEST 2021

On 21/08/2021 12:54, Adam Inglis (synthDIY) wrote:
> The reference you quote is dated August 2005.
> It talks about the contribution of tin-lead (SnPb) solder to ozone depletion and acid rain (among other things). Even global warming gets a mention.

Yes it is a life cycle assessment summary, as it says on the first page.
I chose this source, because cheatercheater was talking about both
health AND environment and it summarized both things in a nize overview
table (including confidence in each finding).

> I’m not an expert in this field but it sounds more like a PhD pitch than hard evidence? And it does have that modern ring of alarmism…

It is a study done for the United States Environmental Protection
Agency. What else would you need for "hard" evidence? A long term self
study involving lead solder fumes?

If you ever met one of the old solder guys from any bigger electronics
shop you can _see_ that the lead had impact on them (color of the skin,
pallor, lividity, bluish gum/teeth etc). The impact lead can have on the
human body is known since the 50s, so I if this is alarming news to you
I am happy you learned something today : )

>> On 21 Aug 2021, at 8:24 pm, dh at atoav.com wrote:
>> On 21/08/2021 11:01, cheater cheater wrote:
>>> Leaded paste is easily available. Unless you're a manufacturer, RoHS
>>> doesn't matter. Less lead will contrary to popular belief not save the
>>> environment or anyone's health.
>> So by changing to leaded solder paste I gain nothing but loose the
>> potential to have a process that is RoHs conform (e.g. should I ever
>> sell a small run of my modules)? Why would I do that?
>> Also I am not sure what sources you base your conclusion on, but it is
>> certainly not as simple as "it doesn't matter". It is true that
>> lead-free is not automatically better in terms of environmental and
>> health concerns (depending on the question you are asking), however it
>> is certainly worse in most categories that matter to me (see [1]).
>> As you can see in that source SnPb has a occupational health-non-cancer
>> impact that is by _two magnitudes_ higher than all other paste variants.
>> So if you claim this has no impact on "anyone's health" you are
>> misleading at best unless we are talking about people who solder once a
>> year.
>> ---
>> 1:
>> https://www.epa.gov/sites/default/files/2013-12/documents/lead_free_solder_lca_summary.pdf
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