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Dear Gillie Normal domestic chest freezers run at -18 but for pest de-infestation, you need to leave your things in for 14 days at this temperature. When we replaced our chest freezer, we went for one that is intended for scientific sample storage. It actually seems to run at -40, but we needed a particular size to fit insect drawers in flat. For pest de-in festation, -30 requires only 72 hours so much quicker turn around. Kate Katherine Andrew Principal Heritage Officer Herefordshire Heritage Services Museum Resource & Learning Centre 58, Friar Street Hereford HR4 0AS [log in to unmask] phone 01432 383590 fax 01432 260161 Courier code H16A web site www.herefordshire.gov.uk/museums Check out www.herefordshire.gov.uk/brianhatton for a fantastic new learning resource on this local artist Herefordshire Council's Cultural Service providing opportunities in Arts, Museums and Heritage, Libraries and Sports Development to residents and visitors. -----Original Message----- From: The Natural Science Collections Association discussion list [mailto:[log in to unmask]] On Behalf Of Gillie Newman Sent: 20 December 2010 17:08 To: [log in to unmask] Subject: freezing temperatures? Hello, we need to buy a new chest freezer to keep our fresh new creatures and for de-pesting our existing specimens and new aquisitions. Our old one was a standard temperature -18/-22c - is this still the recommended temperatures for these purposes? Any advice would be most appreciated. Thank you. best wishes and Happy Xmas! Gillie -- Gillie Newman Conservator UCL Collections & Museums Grant Museum of Zoology Darwin Building University College London Gower Street, London WC1E 6BT, England Tel: (+44) 020 7679 2485 or ext.32485 Fax: (+44) 020 7679 7096