Jason,
Phil is correct. You shouldn't have to worry at all about an ignition
or explosion but you need to be very careful with toxic decomposition
gases. In the early days of condensation soldering (as known as vapor
phase soldering) we contracted with the Hercules Ballistic Missile
Division in Rocket Center, WV to do explosive testing of d-limonene
terpene fluids we were using for cleaning and vapor phase liquids we
were using for soldering and found we didn't have an explosive issue.
However, we also do lots of testing of vapor phase liquids because of
the concern for "PFIB". I'm not a chemist and my spelling is terrible
but as best as I can recall it is Perfluroisobutiline and it is
extremely toxic.
Regards,
George
George M. Wenger, Andrew Corporation
Reliability / FMA Engineer
Base Station & Subsystems Group
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Crepeau, Phil (Space
Technology)
Sent: Tuesday, April 19, 2005 4:24 PM
To: [log in to unmask]
Subject: Re: [TN] Welding and Vapor Phase fluid
hi,
if the vapor phase material is a fluorocarbon, i'd be very cautious.
not in regard to an explosion, but in regard to very toxic gases that
can form when fluorocarbons pyrolyze. from.-
http://www.cdc.gov/mmwr/preview/mmwrhtml/00051631.htm
'As a cigarette is smoked, fluorocarbons are then burned or "pyrolyzed",
and the products of decomposition are inhaled with the cigarette smoke.
The actual products of decomposition may vary and are dependent on which
polymers were used and at what temperature and humidity they were
burned. The most common known products of pyrolysis include inorganic
fluorides, hydrogen fluoride, carbonyl fluoride, and perfluoropropane.'
phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Jason Gregory
Sent: Tuesday, April 19, 2005 10:49 AM
To: [log in to unmask]
Subject: [TN] Welding and Vapor Phase fluid
Hello all,
I need to grind and re-weld a bracket in my vapor phase machine and was
wondering what precautions to take? There is a very thin residual amount
of
VP fluid at the bottom of the tank after draining.
Any takers?
Jason Gregory
Manufacturing Engineer
Innova Electronics
(281)653-5593
(281)653-5594 fax
(281)212-0844 cell
[log in to unmask]
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