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. 


Katherine Andrew
Principal Heritage Officer
Herefordshire Heritage Services 

Museum Resource & Learning Centre
58, Friar Street

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-----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?

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 Newman
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