I looked at the Dow data. The inhibitor depletion graph hits 0 ppm
inhibitor in about 105 days. Your sample is around 1600 days in your
storage. I would not consider this "normal" storage as the term is used in
the Dow document.
Your faculty could test the material for performance or run a peroxide test
on it. I suspect that the monomer concentration is fairly low.
Ultimately, this should be disposed of. You could put some ferrous sulfate
in the bottle which will kill any peroxides present, so it will not need to
be handled as highly reactive.
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From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf Of
Sent: Monday, June 27, 2016 6:48 AM
Subject: [DCHAS-L] "Normal storage periods"
I am investigating whether a container of inhibited Dicyclopentadiene that
is lightly used should be retained for future use. The Dow guidance document
on the subject says:
"Considering the inhibitor depletion of 4-TBC in DCPD Resin Grade (see
figure-5) and the fact that no polymer was formed during laboratory testing,
it was concluded that for normal storage periods a dose of 50 ppm will
provide sufficient guard against gum and peroxide formation and product
Their graph shows degradation of the inhibitor over a storage period of 70
The question is whether for 95% Dicyclopentadiene, more than 5 years falls
into the category of "normal storage period"?
Thanks for any thoughts on this.
Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College
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