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"The
jefco resin in the 5 gallon drums if left on a concrete floor or
steel
floor the resin can pull the cold up into the container and ruin
the
resin. Make sure the resin is stored properly for long use."
Not to put too
fine a point on it, but 'cold' does not exist. Cold is simply the absence
of heat, so the heat in the Jefco may conduct down to the cold floor, but such
conduction is not a major factor in a media freezing. The heat radiation
and conduction to the surrounding air is a much bigger loss. Some concrete
slabs, in contact with the ground, may actually stay warmer than the air and,
ever so slightly, protect the Jefco from freezing.
Next, it
should not be assumed that, because the Jefco got cold and crystallized, that it
is ruined. We use polymer by the ton, literally, and if our polymer
freezes and crystallizes, we must rewarm the polymer to about 140F to dissolve
the crystals. Thereafter, the efficacy of the polymer is fully
restored.
While this
observation is pertinent to an epoxy and styrene system that we use for a
non-aviation purpose, it's important to understand that such experience is fact
specific; in this case, product specific. I defer to the manufacturer of
Jefco as to what their recommendation is for their products. Out of
an abundance of caution, they may say not to use it for structural components,
but I doubt there is any problem with non-structural
components.
You can confirm the viability
of the components if you do a PCP (process control program) bench sample to
confirm that the components cure to a rock hard product when applied to a
test strip.
Chuck
Jensen
Posted for "Justin Hawkins"
<JustinH@lancair.com>:
All Lancair customers the build shop
did a test on the Jefco resin, if
it gets close to freezing even for
only a matter of minutes the resin
can crystallize and its properties
ruined. So if that happens clean the
pump replace the
resin.
The jefco resin in the 5 gallon drums if left on a
concrete floor or
steel floor the resin can pull the cold up into the
container and ruin
the resin. Make sure the resin is stored properly
for long use.
Justin
Hawkins
Lancair Airframe & Technical
Support
Lancair Int. Inc.
250 SE Timber
AVE
Redmond, OR
97756
justinh@lancair.com
<mailto:justinh@lancair.com>
541-923-2244 ext
121
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