Hi Adie, I follow the instructions from David Pinniger and Dee Lauder in the book 'Pests in houses great & small': Remove items carefully: many materials can become very brittle at low temperatures. Once they have been removed, place the items on racking or a non-absorbent surface and allow them to return to room temperature for at least 24 hours before unwrapping. Very dense objects should be left for at least 48 hours. After items have returned to room temperature, they can be unwrapped and cleaned.
Regards, Loes Knoop Consultant IPM Helicon conservation support l.kn...@helicon-cs.com Op dinsdag 19 januari 2021 om 10:15:09 UTC+1 schreef Adrian Doyle: > 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 > > 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. To unsubscribe from this group and stop receiving emails from it, send an email to pestlist+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pestlist/ee1f8d17-f9e4-4c9a-9f37-3d3d46372c0fn%40googlegroups.com.
