If it is opened in air, I could only imagine that it would slowly hydrolyze to formic acid and dimethylamine if opened in air, which would form impurities. Perhaps that is why the manufacturer recommends it be disposed of. I do not think any reactive impurities form.
Jordan M. Sumliner, MS
Environmental Health and Safety Professional II
Environmental Health and Safety Office
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**med.cornell.edu] On Behalf Of Stuart, Ralph
Sent: Tuesday, August 04, 2015 11:26 AM
Subject: [DCHAS-L] DMF "use within 5 years"
During a lab inspection today, I noticed a bottle of extra pure Dimethylformamide in one of our labs that had a note on the manufacturers (Acros) label that says "use within 5 years of opening". A little Google searching doesn't seem to indicate the DMF is a peroxide former, so I wonder if anyone can shed some light on why this time limit is recommended?
The bottle was received in Jan 2011, so inquiring miles would like to know.
thanks for any insight on this.
Ralph Stuart CIH
Chemical Hygiene Officer
Keene State College
Keene, NH. 03431
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