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Subject:	Re: Vapour Phase Soldering material
From:	Gary McCauley <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 17 Oct 2001 08:27:04 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (39 lines)

I had a similar experience several years ago.  To make a long story
short, methylene chloride was going through what we call a 
torpedo heater.  A several thousand BTU gas fired portable heater.
Sampling showed phosgene being produced.  In fact several workers
had already been taken to the hospital before I was even notified that
there was a problem

gary mccauley


-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Wednesday, October 17, 2001 7:49 AM
 
OTOH, I had a customer who had an employee who smoked in the presence of
a heavy concentration of 1,1,1-trichloroethane vapours (machine had
leaked and he was swabbing the liquid from the floor) and who got
pulmonary oedema, as a result of phosgene. Fortunately not fatal, but
sufficient for a couple of weeks in hospital and a permanent resultant
weakness of the lungs. Another client had a low-level phosgene problem
with the same solvent, being used for defluxing in a vapour degreaser in
the same room as the soldering machine. The operators claimed headaches.
Carbon badges detected phosgene at the limit of measurement.
Investigation showed that, whereas it would normally require about
380-400°C for TCA to decompose, tin oxide at 250°C catalysed a minute
decomposition of the vapours, just sufficient to be unpleasant, despite
the extraction from the machine.
 

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