Morning from a cold soggy Britain I undertook research some time ago on polyethylene bags for freezing but most of it was un-published.
However, we did note the following things to be aware of when freezing and perhaps someone can fill in the gaps as I don’t have the research any more. 1. Check the thickness of the polyethene and go for something which is a thicker grade plastic as it helps prevent moisture transmission 2. Check that the seals are well made as some of them are pretty thin and will tear easily. 3. Zip loc seals are not moisture resistant and need to be taped over as well Hope that helps Adie Doyle IPM Manager British Museum From: 'Oliver, Margaret' via MuseumPests <pestlist@googlegroups.com> Sent: 08 December 2020 22:06 To: pestlist@googlegroups.com Subject: Re: [PestList] Source for Polyethylene bags for Freezing objects I also use bags from Uline for the freeze/thaw cycle (specifically, these 30"x36" 8 mil poly bags https://www.uline.com/Product/Detail/S-12510/Flat-Poly-Bags/30-x-36-8-Mil-Poly-Bags?keywords=S-12510). They're good sized bags that allow me to twist the open end of it shut and seal it with a releasable zip tie. Best, Margaret Margaret Oliver, M.S. Herbarium Collections Manager (she / her) The University of Tennessee, Knoxville University of Tennessee Herbarium (TENN) 114 Temple Hall 1818 Andy Holt Ave. Knoxville, TN 37996-2800 moliv...@utk.edu<mailto:moliv...@utk.edu> 865-974-6213 http://herbarium.utk.edu Facebook<https://www.facebook.com/UTKHerbarium/> | Instagram<https://www.instagram.com/utkherbarium/> | Twitter<https://twitter.com/UTKHerbarium> Big Orange. Big Ideas. ________________________________ From: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> on behalf of Lisa Isbell <lisa.h.isb...@gmail.com<mailto:lisa.h.isb...@gmail.com>> Sent: Tuesday, December 8, 2020 4:50 PM To: pestlist@googlegroups.com<mailto:pestlist@googlegroups.com> <pestlist@googlegroups.com<mailto:pestlist@googlegroups.com>> Subject: Re: [PestList] Source for Polyethylene bags for Freezing objects [External Email] I have ordered bags from Uline<https://www.uline.com/Grp_5/Reclosable-Poly-Bags>. Some of these get up to a sufficiently large size easily to hold a full sheet of matboard or an archival box. Disclaimer: I am not aware of any testing having been done on these (for additives, plasticizers, etc.) However, if one is using this only for a freeze-thaw cycle (and not for long-term storage) it may be justifiable. Cordially, Lisa Isbell On Tue, Dec 8, 2020 at 3:22 PM Minor, Rachel <rmi...@santarosa.edu<mailto:rmi...@santarosa.edu>> wrote: Hi, Pest List People! I am waiting for our new chest freezer and am now researching polyethylene bags or film for wrapping objects to be treated. I appreciate any advice on this. I am finding lots of smaller zipper heavy 3 – 4 mil bags available but I will also be freezing larger objects, and wonder if you recommend and type of film and a tape that can withstand the deep freeze. Should objects be airtight before freezing, or just well covered? Thanks so much for your help Rachel Minor Museum Supervisor/Curator Jesse Peter Multicultural Museum Santa Rosa Junior College 1501 Mendocino Avenue Santa Rosa, CA 95401 (707) 524-1862 https://museum.santarosa.edu/ [email size museum logo] We acknowledge that we gather at Santa Rosa Junior College on the territorial traditional land of the Pomo People, past and present, and honor with gratitude the land itself and the people who have stewarded it throughout the generations. -- 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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