Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Caught in rain
Date: Thu, 8 May 2025 08:43:21 -0400
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On 5/7/2025 9:15 PM, Jeff Liebermann wrote:
> On Wed, 7 May 2025 19:46:09 -0500, AMuzi <am@yellowjersey.org> wrote:
> 
>> On 5/7/2025 6:49 PM, Jeff Liebermann wrote:
>>> On Wed, 7 May 2025 07:24:50 -0400, Zen Cycle <funkmaster@hotmail.com>
>>> wrote:
>>>
>>>> I rinse mine for a few minutes in a coffee can with brake cleaner
>>>> (https://www.grainger.com/product/CRC-Brake-Cleaner-Solvent-35WT64)
>>>
>>> Almost pure dry cleaning solvent:
>>>
>>> <https://www.grainger.com/sds/pdf/259633.pdf>
>>>     Chemical name:  tetrachloroethylene
>>>     Common name and synonyms:  perchloroethylene
>>>     CAS number:  127-18-4
>>>     %  90 - 100%
>>>
>>> "EPA Proposes Ban on All Consumer and Many Commercial Uses of
>>> Perchloroethylene to Protect Public Health"
>>> <https://www.epa.gov/newsreleases/epa-proposes-ban-all-consumer-and-many-commercial-uses-perchloroethylene-protect>
>>>
>>> "Risk Management for Perchloroethylene (PCE)"  (Dec 2024)
>>> <https://www.epa.gov/assessing-and-managing-chemicals-under-tsca/risk-management-perchloroethylene-pce>
>>> "EPA has set a 10-year phaseout for the use of PCE in dry cleaning to
>>> eliminate the risk to people who work or spend considerable time at
>>> dry cleaning facilities."
>>>
>>
>> We used trichloroethane for cleaning for years, small drums
>> to fill Milwaukee Sprayers:
> 
> Please be careful with the chemical names.  The chemical Zen Cycle
> uses is tetrachloroethylene.  The chemical that you're talking about
> is trichloroethylene, which is a very different chemical.
> 
>  From 1971 to 1973, I spent some time on a PCB (printed circuit board)
> and hybrid IC (integrated circuit) soldering production line.  We
> would wash off the rosin flux with trichloroethylene (and
> trichlorethane) with no gloves and breathing protection.  In about
> 1995, we had a reunion and compared notes.  

In the early 80's when I first started as a technician in the 
electronics industry vapor degreasers with trichlorethane were all the 
rage. I do remember that sticking an un-gloved hand beneath the 
condensers would dessicate the outer layer of skin. As a production 
technician at the time my exposure was limited to the few times I needed 
to do a PCB repair, probably less than once a week.

That was phased along with a host of other chloro/flouro carbons due to 
ozone depletion.  About the time that trichlorethane was fully phased 
out, water soluble fluxes had been developed for mass production (wave 
solder systems) so degreaser tanks were replaced with large ultrasonic 
cleaners. We still operate a through-hole line here with a wave solder 
machine. Our process is to use an IPA bath (no, not the beer), followed 
by the ultrasonic cleaner. I don't think I ever been exposed to 
trichloroethylene, at least, my liver is still in good shape.

> We discovered that nearly
> everyone that had worked on the production line had some form of liver
> damage.  I was the only one who didn't have liver damage, possibly
> because I spent less time near the soldering machines.

Liver damage from trichloroethylene is mentioned here:
https://ecolink.com/info/trichloroethylene-vs-trichloroethane/