We have had a similar experience here.  The glue is the problem.  Either  freezer is very effective if drawers are  treated over a number of days. 

Jackie Miller 

-----Original Message-----
From: Entomological Collections Network Listserve [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, February 22, 2017 8:21 AM
To: [log in to unmask]
Subject: Re: freezing drawers for pest control

Hi Richard

I have had the experience that the glue holding the unit trays together sometimes comes loose .  No problems with the specimens or drawers themselves so far, although I worried about specimens coming off points.

> We are receiving some major donations, some of which have had some 
> dermestid damage.  We have regular freezers as well as an ultra-low 
> freezer.  Does anybody know of adverse effects of putting drawers of 
> specimens in an ultra-low freezer before the drawer is brought into 
> museum?
> -- Richard L. Brown
> Mississippi Entomological Museum
> Dept. Biochemistry, Molecular Biology,
>       Entomology & Plant Pathology
> Box 9775 (100 Old Highway 12)
> Mississippi State, MS 39762
> PH:  662-325-2990
> Cell: 662-694-0174

James B. Whitfield
Department of Entomology
320 Morrill Hall
505 S. Goodwin Avenue
University of Illinois
Urbana, IL 61801