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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