[NHCOLL-L:5287] RE: Sealing wet collection jars

[Dirk Neumann]

Hi Ashley

Bakelite consists of Paraformaldehyde-monomers which are cracked e.g. by 
residual formaldehyde emitting / escaping from (formalin) fixed 
specimens. PE-lids (with additional PE-liners inside) work fine, as long 
as you don't have any aggressive denaturing agents added to the alcohol. 
These PE-liners even can protect Bakelite lids (we have some of those 
from the 1970ies in still good condition in the collection).

Would agree that Parafilm is not reliable in the long run. You should 
consider to replace those lots with glasses & lids as Andy suggested. 
This is more cost efficient in the long run compared to the consumed 
working time for keeping on track of eventual evaporation issues and 
costs for replacing the ethanol. Even more, since when filling up with 
70% ethanol, you further dilute the ethanol (topping residual alcohol at 
a concentration of ca. 40-50% with 70 % will roughly end up at a 
concentration round about 50 % - depending on the added volume of course).

John Simmons nice book is a perfect guide for fluid collections 
(available at approx. 11U$)


Dirk


Am 23.02.2011 14:54, schrieb O'Brien, Mark:
>
> I'll reiterate what Andrew Bentley said.  Polyethylene lids with poly 
> liners from Kols Containers are the way to go.  We have thousands of 2 
> oz  and 8 oz jars with these lids, and have been using them for 30 
> years with success.   Bakelite lids for larger jars are not reliable, 
> though for vials and 1 oz jars they work well so long as they have 
> polyseal cone liners.
>
> Mark
>
> =================================================
>
> Mark F. O'Brien, Collection Manager
>
> Insect Division, Museum of Zoology
>
> University of Michigan, Ann Arbor, MI  48109-1079
>
> 734-647-2199    fax: 734-763-4080
>
> =================================================
>
> *From:* owner-nhcoll-l at lists.yale.edu 
> [mailto:owner-nhcoll-l at lists.yale.edu] *On Behalf Of *Ashley Henderson
> *Sent:* Tuesday, February 22, 2011 5:46 PM
> *To:* NHCOLL-L at lists.yale.edu
> *Subject:* [NHCOLL-L:5277] Sealing wet collection jars
>
> Hi Everyone,
>
> I am searching for a supply to seal the jar lids in our wet 
> collection.  I purchased polypropylene sealing tape that is 
> advertised for use with wet collections.  However, it has proven about 
> as effective as wrapping scotch tape around the lids.  The lids were 
> previously sealed with what appears to be very thin paraffin wax that 
> came in tape form.  However, I cannot find this supply.  This link has 
> an uploaded picture of the wax/tape substance 
> http://i.imgur.com/uZUlM.jpg  Does anyone out there have any ideas on 
> this or another way of sealing the lids?  Whatever I use must go on 
> the exterior of the jars because many of the jars have a plug type 
> lid.  Thanks in advance!
>
> Ashley Henderson
>
>
> Collection Manager
> Corpus Christi Museum of Science and History
> www.ccmuseum.com
> (361) 826-4659
>
> Visit us on Facebook!
>
> Discover La Belle at www.corpuschristimuseumlabelle.blogspot.com 
> <http://www.corpuschristimuseumlabelle.blogspot.com/>
>


-- 
Dirk Neumann

Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de

Postanschrift:

Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Labor
Münchhausenstr. 21
81247 München

Besuchen Sie unsere Sammlung:
http://www.zsm.mwn.de/ich/

---------

Dirk Neumann

Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de

postal address:

Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Lab
Muenchhausenstr. 21
81247 Munich (Germany)

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