A review of the Kester data sheet indicates that the flux chemistry is
corrosive and electrically conductive.

You didn't specify the avionics application your hardware is being designed
for, so I'll assume the most demanding - space flight.

Avionics hardware reliability is considered critical to the vehicle, crew,
and mission.  Some materials (even metals) sublimate at reduced pressure -
not good if there are humans or optical surfaces in the immediate area.
Electrical isolation drops.

NASA Workmanship requirements and J-STD-001CS prohibit use of this flux
chemistry on flight and mission critical electronics, unless there is sound
engineering rationale, backed up by objective evidence, that use of this
material will not damage or degrade the hardware, and that the cleaning
process is effective, in control, and verifiable.  Use requires customer
approval prior to use.

Bob

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of prasad godavarti
Sent: Sunday, October 02, 2005 11:56 AM
To: [log in to unmask]
Subject: [TN] use fo high halide flux on avionics: kester 331 flux

does anyone have any information on the performance of
cored wire kester 331 fluxed sn-pb solder.  I am
unable to find much in the  literature, in fact all i
can see is words of caution: do not use. Thanks

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