From: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**>
Subject: [DCHAS-L] "Normal storage periods"
Date: Mon, 27 Jun 2016 13:47:36 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: D2D46EB9-C0D4-4871-BCFA-08FA33ADF0BC**At_Symbol_Here**

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

Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College


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