Wondering what types of objects are you freezing? We use -32 at 72 hrs. cold
then carefully remove and shelve nearby the freezer with a 24 Hr.
re-acclimation period. We have never seen any thermal shock issues. I would
think that the bags help with objects thawing a bit slow and even? Thoughts
anyone. JTV
Joel Voron Colonial Williamsburg Foundation
Conservation Dept.
Integrated Pest Management
Office 757-220-7080
Cell 757-634-1175
E-Mail jvo...@cwf.org
[1474552137245_IMG_0499.JPG]
________________________________
From: pestlist@googlegroups.com <pestlist@googlegroups.com> on behalf of Alan P
Van Dyke <apvand...@utexas.edu>
Sent: Tuesday, January 19, 2021 10:32 AM
To: pestlist@googlegroups.com <pestlist@googlegroups.com>
Subject: Re: [PestList] Thawing times after freezing
[CAUTION: This message originated from outside the Foundation. Do not click
links, open attachments or take action unless you know the contents are safe]
We usually just turn off the freezer and wait until it comes up to ambient
temperature with the freezer door closed. This takes about 24 hours, though we
don't go as cold as you. If, for some odd reason, the temp comes up too
quickly we'll bring up the temp in stages. So far no problems.
Alan
Alan Van Dyke
Senior Preservation Technician
Harry Ransom Center
The University of Texas at Austin
P.O. Drawer 7219
Austin, Texas 78713-7219
P: 512-232-4614
www.hrc.utexas.edu<http://www.hrc.utexas.edu/>
[https://docs.google.com/uc?export=download&id=1rqiR2nrgyoj0efqQIZR-nz7WGyw16bBn&revid=0B14-z3QUvdNTT0UyTlZJMUl4dHErTWYzVWdnSnVOUE90alBFPQ]<http://hrc.utexas.edu>
On Tue, Jan 19, 2021 at 3:15 AM 'Adrian Doyle' via MuseumPests
<pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> wrote:
Morning folks,
we are trying to get some extra freezing done as we have lost time due to the
Covid epedemic.
Has anyone got any research on thaw times for freezing they are prepared to
share?
At the moment we have a rather long return to ambient from -35c / -30c
primarily to allow the objects to thaw slowly and prevent thermal shock but
would like the option to reduce this both in our manual operation and to change
our computer settings.
Note we do not open the freezer and handle the objects whilst frozen as a
precaution due to potential embrittlement.
our current programme is this
48 hours to reach -35c (or more if not met)
72 hours at -35c to treat
41 hours to defrost/thaw
Any thoughts on this would be appreciated
many thanks
Adie
Adrian M Doyle is currently working from home but is available via e mail on
ado...@britishmuseum.org<mailto:ado...@britishmuseum.org>
Adrian (Adie ) Doyle
Integrated Pest Manager
Department of Property and Facilities Management
British Museum
London
UK
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