Interesting (encouraging!) that we seem to agree on kill times and temperatures and we have remote probes in a crate or a block of wood to additionally confirm (as best we can) the core temperature of an object.
From: pestlist@googlegroups.com <pestlist@googlegroups.com> On Behalf Of Helen Coxon Sent: 19 January 2021 15:59 To: pestlist@googlegroups.com Subject: RE: [PestList] Thawing times after freezing I am aware of that, but unless it’s a really small mass load, our freezer operating at full blast almost always takes longer than four hours to drop the temperature below -20C, which is the “kill point”. We do the best we can! Helen From: 'Adrian Doyle' via MuseumPests <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> Sent: Tuesday, January 19, 2021 10:57 AM To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> Subject: RE: [PestList] Thawing times after freezing [EXTERNAL EMAIL] DO NOT CLICK links or attachments unless you recognize the sender and know the content is safe. Hi Joel and Helen I seem to remember the four hours kill time but don’t have anything published to refer to? Any ideas where this may be published We have not had reemergence Adie From: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> On Behalf Of Voron, Joel Sent: 19 January 2021 15:53 To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> Subject: Re: [PestList] Thawing times after freezing The Temp dropping quickly within four hours is important to kill all life stages before pest can develop "antifreeze like properties". Have you had any issues with reemergence of pests in treated objects? Joel Voron Colonial Williamsburg Foundation Conservation Dept. Integrated Pest Management Office 757-220-7080 Cell 757-634-1175 E-Mail jvo...@cwf.org<mailto:jvo...@cwf.org> [1474552137245_IMG_0499.JPG] ________________________________ From: 'Adrian Doyle' via MuseumPests <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> Sent: Tuesday, January 19, 2021 10:44 AM To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto: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] Hello folks mostly mixed organic materials and some composite ones Ethnographic - wood, feathers, fur, cane etc All are double wrapped and buffered where necessary with acid free tissue balls/pads bags are sealed with heat sealers and heavy-duty tape Adie ________________________________ From: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> on behalf of Voron, Joel <jvo...@cwf.org<mailto:jvo...@cwf.org>> Sent: 19 January 2021 15:42 To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> Subject: Re: [PestList] Thawing times after freezing 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<mailto:jvo...@cwf.org> [1474552137245_IMG_0499.JPG] ________________________________ From: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> on behalf of Alan P Van Dyke <apvand...@utexas.edu<mailto:apvand...@utexas.edu>> Sent: Tuesday, January 19, 2021 10:32 AM To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto: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 -- You received this message because you are subscribed to the Google Groups "MuseumPests" group. 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Following guidance of the Ontario Chief Medical Officer of Health, the ROM is temporarily closed to the public. Visit www.rom.on.ca<https://www.rom.on.ca> for further updates. ________________________________ Suivant les conseils du médecin hygiéniste en chef de l’Ontario, le ROM est temporairement fermé au public. Des mises à jour seront publiées à www.rom.on.ca/fr<https://www.rom.on.ca/fr> -- 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<mailto:pestlist+unsubscr...@googlegroups.com>. 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