Hi Ken - I am not a solder paste "expert", just a user! Was the solder
paste jar properly sealed prior to putting it back into the refrigerator?
We routinely use solder paste from partial jars that have been properly
stored overnight for some low volume, hand stenciling operations. The jar
must be sealed (the lid must be on correctly!)  to prevent loss of the
paste volatiles and to prevent moisture absorption. We also conduct the IPC
JSTD 005 solder balling test everyone morning to evaluate the paste
condition.  We consume a jar (500 grams) in about 7-10 days so the time
period is short which is also a factor. We haven't experienced any negative
problems with this practice yet. Good Luck.

Dave Hillman
Rockwell Collins
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[log in to unmask] on 11/26/97 06:57:12 PM

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Subject:  [TN] Use half empty solder paste jar next day?




Solder paste expert,
Does anyone heard of using half empty jar of Solder paste next day after
refrigerating overnight. Obviously paste has to come to room temperature
before use.
Does any paste supplier recommend this? This is kind of strange to me. My
assembly house may be using leftover solder paste next day.
Have happy Thanksgivings.
re,
ken patel
______________________________________________________
Ken Patel                       Phone:  (408) 490-6804
575 Cottonwood Dr.              Fax:    (408) 490-6859
Milpitas, CA 95035              Beeper: (888) 769-1808
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