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Subject: [DCHAS-L] LISTSERV problems
Date: Monday, June 27, 2016 8:00:56 AM
Author: Ralph Stuart <ras2047**At_Symbol_Here**MED.CORNELL.EDU> 		Next by Date:
Subject: [DCHAS-L] CHAS Workshops
Date: Mon, 27 Jun 2016 08:13:34 -0700
Author: NEAL LANGERMAN

From: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**keene.edu>
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**keene.edu


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.
https://urldefense.proofpoint.com/v2/url?u=http-3A__msdssearch.dow.com_PublishedLiteratureDOWCOM_dh-5F0957_0901b803809577d1.pdf-3Ffilepath-3Daromatics_pdfs_noreg_778-2D04301.pdf-26fromPage-3DGetDoc&d=DQIFAg&c=lb62iw4YL4RFalcE2hQUQealT9-RXrryqt9KZX2qu2s&r=meWM1Buqv4IQ27AlK1OJRjcQl09S1Zta6YXKalY_Io0&m=Ck27htc85TRXjLKtcdUuqnJyTky1v4vfykG9JqNPQUA&s=Pf7oI2AAScAx2SoaudNnnAJyMiY150NrP8qPE6Ec7ZU&e=

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

ralph.stuart**At_Symbol_Here**keene.edu

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