Dicyclopentadiene is an industrial byproduct of steam cracking, so it's dirt cheap. $25 for 100 grams from Aldrich. So there's no compelling reason to hold onto an excessive extra amount.
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 degradation."
Their graph shows degradation of the inhibitor over a storage period of 70 days.
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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