Date: Wed, 11 Aug 2010 12:46:50 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: tanis.marquette**At_Symbol_Here**HEXION.COM
Subject: Re: Old Formalin With Lots of Precipitate

The paraformaldehyde has settled out.

  From: Dan Blunk [blunk**At_Symbol_Here**UCSC.EDU]
  Sent: 08/11/2010 10:28 AM MST
  To: DCHAS-L**At_Symbol_Here**LIST.UVM.ED U
  Subject: [DCHAS-L] Old Formalin With Lots of Precipitate


I wondered if you’ve run into this previously:

A physical plant person brought me a pint reagent bottle labeled 37% Formaldehy de this morning that he found while remodeling a workspace.

The bottle is the original Mallinckr odt AR bottle.< /font>

It’s about =C2=BE full, and appears to have been opened.< /p>

About 50% of the volume of the bottle is a white precipitate, with about =C2=BC vol ume of clear liquid above.

The purchase date on the label is smudged, but it appears the bottle is at least 35 years old.

As I remember, aldehydes do undergo a slow polymerization reaction. I wouldn’ ;t expect an aqueous solution to form peroxides.




Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.