This is a message from the Museumpests List. To post to this list send it as an email to [email protected] To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi all,
It sounds like this is a freezer that includes an automatic defrost unit. Recommendations are for a freezer that maintains the critical kill temperature (about -4 C F; -18 degrees C) at a constant rate - not fluctuating. I usually aim for about -20 deg. C to be safe. With warmer temperatures and the defrost cycle the freezing process will take longer and there is a greater chance that the insects will develop the "anti-freeze" and the kill be less affective. Good luck Gretchen From: [email protected] [mailto:[email protected]] On Behalf Of derya gölpinar Sent: Thursday, August 23, 2012 8:55 AM To: [email protected] Subject: RE: [pestlist] Freezing Collections This is a message from the Museumpests List. To post to this list send it as an email to [email protected]<mailto:[email protected]> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi Kelly, This is what is says on the museumpests.net website under low temperature treatment (in the "solutions" section) http://www.museumpests.net/cms/genericpdfmaker.asp?id=3&file=treatmentfacts "Whichever kind (of freezer) is used, a good rule of thumb is that it should be capable of maintaining minus 20 degrees F (minus 29 degrees C). Ultimately the appropriate exposure period for insect eradication will depend on both the minimum operating temperature of the freezer as well as the type of insect. A freezer that maintains this temperature will sufficiently lower the materials to the freezing point within four hours, which kills adult insects as well as their eggs. If the temperature drop takes much longer, some varieties of insect are capable of producing an 'anti-freeze' that allows them to survive freezing. With wood pests such as powderpost beetles, a second treatment may be necessary to insure complete kill. This is particularly important forlarge wooden objects, where temperature change may take longer then four hours to penetrate to the core." Since I am familiar with the -20F rule of thumb, I would also be curious to hear others thoughts on using a freezer at -4 to +7F range. I once did a three day freeze treatment using a freezer that only went down to -18F and it worked fine, however the piece being treated was a small leather shoe - nothing large :) best, Derya ________________________________ From: [email protected] To: [email protected] Subject: RE: [pestlist] Freezing Collections Date: Tue, 21 Aug 2012 21:59:12 +0000 This is a message from the Museumpests List. To post to this list send it as an email to [email protected]<mailto:[email protected]> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi Derya, The collections are already in the freezer. The freezers at the facility range in temperature from +7 degrees Fahrenheit to -4 degrees Fahrenheit. They couldn't tell me on the spot which freezer the collection is in. I can get the exact temperature tomorrow if need be. Does anyone have any thoughts about this range, -4 to +7 degrees Fahrenheit? Thanks, Kelly From: [email protected] [mailto:[email protected]] On Behalf Of derya gölpinar Sent: Friday, August 17, 2012 2:37 PM To: [email protected] Cc: [email protected] Subject: Re: [pestlist] Freezing Collections This is a message from the Museumpests List. To post to this list send it as an email to [email protected]<mailto:[email protected]> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi Kelly, How cold were you planning to freeze the materials? -Derya On Aug 17, 2012, at 5:24 PM, "Kelly Meyers" <[email protected]<mailto:[email protected]>> wrote: This is a message from the Museumpests List. To post to this list send it as an email to [email protected]<mailto:[email protected]> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- I have approximately 65 boxes (varying in size from approximately 1-1.5 cubic feet) of archaeological fauna, sediment and radiocarbon samples that we are freezing as a preventative measure due to poor storage and transportation conditions. The collections are palletized with 9 boxes on each row, 4 rows high. It would save a fair amount of work and coordination if I could remove the pallets from the freezer after 12 days rather than the normal 14. Can anyone comment on the efficacy of freezing for 12 days without a thaw and refreeze? The boxes are packed fairly tightly, but most of it is bone in paper or plastic bags so I think the temperature will drop pretty quickly, even in the center of the pallets. Thanks! Kelly ____________________________________ Kelly Meyers Archaeology Collections Coordinator Burke Museum of Natural History and Culture 206-543-7696 [email protected]<mailto:[email protected]> ---------------------------------------------------------------------- To send an email to the list, send your msg to [email protected]<mailto:[email protected]> To unsubscribe from this list send an email to [email protected]<mailto:[email protected]> and in the subject put: "unsubscribe" - no quotes please. You are receiving the Pestlist emails in standard mode. 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