IBM did not have an exclusive on trichloroethane. Just about all companies
using rosin flux on their solder line used trichloroethane to clean off the
flux. Now days an acid flux is used because it can be cleaned off with water
and a bit of base added to neturalize the water before sending it down the
drain. Naturally, the soldering line has to use lead free solder so that no
lead compounds go down the drain also. Getting rid of the contaminated
Trichloroethane became a problem after EPA got serious about these sort of
things. I remember several instances where the degreaser caught on fire
because it had so much stuff desolved in the trichloroethane. Also, one fellow
almost died after breathing the fumes when cleaning out the tank.
Trichloroethylene, used to be used but it caused cancer. And one time
carbon tetrachloride use to be used. It was really bad stuff.
73
Bill wa4lav
-----Original Message-----
From: "Harold B. Mandel" <ka1xo@juno.com>
To: Japerlick@aol.com
Date: Mon, 14 Feb 2005 19:35:49 -0500
Subject: [Amps] Degreasing Ceramic
In the paragraph below do you actually mean trichloroethylene
or do you refer to 1,1 Trichloroethane (Methyl Chloroform)?
The former, trichloroethylene, smells completely different than
the chloroform. The latter was commonly known as "IBM Cleaning
Fluid," and was removed from all service.
The last cleaning fluid used in copious amounts at IBM was
Perchlorethylene (dry-cleaning fluid), used to melt off the
flux on chips left by the wave-soldering machine. The chips were
immersed in boiling Perc for a while and then transferred to
a vapor tank where perc condensed on the chips and dripped
off.
My lab had a Freon boiler. We would soak our ceramics in
a tank of boiling Freon, or rather just above the fluid level
and the mist would degrease the surfaces. The nastiest job
was when someone dropped a thousand or so chips into the
boiling Freon and had to scoop them out by bending over the
top of the tank.
Trichloroethylene is the nastiest smelling of all the stuff above.
Trichloroethane smells pretty good, but it's chewing up your
insides faster than the ethylene. Perc snuffs out your brain cells
as does the Freon. Mix handling these with responsibilities
handling radioactive isotopes and you can see why we had
plant-wide evacuations about once a month.
There's a huge class-action lawsuit of ex-IBM'ers who got sick
using Cleaning Fluid. I think I read that some 5 out of the 20
who initiated action have died along the way.
If you're going to degrease ceramics using solvents at least do
it outside where the fumes can't be sucked into the furnace register
and be turned into Phosgene gas....
Respectfully,
Hal Mandel
W4HBM
> When in doubt, I always use 99% alcohol or even
> MEK or (1,1,1 Trichlorethylene) but the last two are really bad SH_T
> and you don't want it lying around!
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aas does the Freon. Mix handling these with responsibilities
handling radioactive isotopes and you can see why we had
plant-wide evacuations about once a month.
There's a huge class-action lawsuit of ex-IBM'ers who got sick
using Cleaning Fluid. I think I read that some 5 out of the 20
who initiated action have died along the way.
If you're going to degrease ceramics using solvents at least do
it outside where the fumes can't be sucked into the furnace register
and be turned into Phosgene gas....
Respectfully,
Hal Mandel
W4HBM
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