SPI Supplies Refrigerated Storage Recommendations
Extend the useful shelf life of many items just by storing them under
refrigerated conditions!
Comments about "store refrigerated" products:
When a product deteriorates with time, and it is a "rate" controlled
process, then refrigerated storage will slow down that deterioration rate,
and if you are a believer in the
Arrhenius Equation the
you would know that for every 10 C° there is
a reduction in reaction rate of one order of magnitude (e.g. 10X).
By way of example, if a reaction-prone chemical reagent, instead of being
stored at 20° C is stored at 0° C, then that would represent two
orders of magnitude temperature drop, or changes would now be occurring
100X more slowly.
For the SPI-Chem™ brand of chemicals, those
that we believe can have their useful shelf life extended substantially, we
have denoted as requiring "cold storage". Of course, many chemicals won't
be so effected, and hence there is no point in keeping them under
refrigeration and they can be stored at room temperature with essentially the
same end result. Certain other products in our SPI Supplies product line
are recommended to be stored under refrigeration, even though they are not
normally thought of as being "cold storage" products. For example, all
SPI Supplies® Brand transfer symbol
sheets, indeed all transfer symbol sheets that we know about, contain a
small amount of a plasticizer and just like a lawn type garden hose, when
its plasticizer diffuses out, and it become brittle, so will transfer symbol
sheets undergo the same kind of plasticizer migration and become brittle
(and useless). However, storing transfer symbol sheets refrigerated,
exactly like one would store photographic paper and film, has to potential
to extend transfer symbol sheet shelf life as well. We recommend storage
at 4° C. Certain products that are aqueous based and sealed in glass
(e. g. aqueous glutaraldehyde) should
not be stored below 4° C because of possible breakage risk from the
coefficient of thermal expansion if the solution should freeze. When
anything that has been refrigerated is taken out from the refrigerated area
for use, it is important that it be allowed to warm up to room temperature,
other wise there is the risk of moisture condensation in into the volume of
the container, reducing the efficiency of some of the SPI-Chem products, for
example.
Virtually all adhesive products, including SPI Supplies Brand Double Sided
Conductive Carbon Adhesives (sheets, rolls, and tapes), one projects that they
will not be used within 12 months of their receipt, then we would suggest
refrigerated storage in order to preserve their excellent characteristics.
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Tuesday February 09, 2010
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