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://hrc.utexas.edu> On Tue, Jan 19, 2021 at 3:15 AM 'Adrian Doyle' via MuseumPests < 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 > > Adrian (Adie ) Doyle > Integrated Pest Manager > Department of Property and Facilities Management > British Museum > London > UK > > -- > You received this message because you are subscribed to the Google Groups > "MuseumPests" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to pestlist+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/pestlist/PR1PR02MB4746936BEEC8F03D65C3FF34DDA30%40PR1PR02MB4746.eurprd02.prod.outlook.com > <https://groups.google.com/d/msgid/pestlist/PR1PR02MB4746936BEEC8F03D65C3FF34DDA30%40PR1PR02MB4746.eurprd02.prod.outlook.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "MuseumPests" group. To unsubscribe from this group and stop receiving emails from it, send an email to pestlist+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pestlist/CAHhLO3YxRaj_oVSQahSc00jUHnzo%3DYLD04fyQXZG8vSDzEY%3Dkw%40mail.gmail.com.
