[Nhcoll-l] jar lids

[Dirk Neumann]

Dear Mike,

depending on the climatic conditions inside you storage area and the 
holding fluid the specimens are stored in rusting of lids can be a major 
issue of course. However, because of the narrow thread of twist-off 
jars, I am not entirely sure of the metal lids can be easily replaced 
with plastic lids. The latter usually need higher threads because 
plastic lids tend to be deformed when screwed tight. This is the reason 
why jars with plastic lids normally have two fully closed thread turns, 
compared to jars with metal lids which usually only have half thread turns.

Moreover, plastic lids (e.g. PE or PP lids) do not form a good barrier 
against oxygen, and changing lids might increase or trigger oxidation 
issues inside jars.

My advice would be to look into modern metal lids designed for food 
industry to close jars with sour ingredients (compared to lids for sweet 
stuff such as jam or honey); these usually have thicker liners inside 
which protect lids against scratching. Also made bad experiences with 
(self-designed) PE-foil inlays, an earlier curator introduced in our 
collection: the foil is no good barrier against compounds evaporation 
from holding fluids, but a perfect trap to hold condensates inside a 
tiny, highly corrosive atmosphere lid and foil which tends to accelerate 
deterioration of metal lids.

Might be worth to check in the food sector for replacement lids or 
inquire such suppliers where to find 130mm lids.

All the best
Dirk

Am 21.02.2018 um 21:57 schrieb Mike Rutherford:
>
> Hi,
>
> I’m trying to source large polypropylene screw top lids for some glass 
> jars I have in my museum. The jars are wide mouthed and squat, making 
> them ideal for those weird shaped specimens but the current lids are 
> thin metal ones which are corroding badly. My previous source for lids 
> was Carolina Biological Supplies but their maximum size of lid is 
> 120mm diameter and I need ones of 130mm diameter.
>
> Can anyone suggest a supplier, preferably in the western hemisphere?
>
> Cheers,
>
> Mike
>
> *Mr. Mike G. Rutherford*
> Curator of the University of the West Indies Zoology Museum (UWIZM)
> Department of Life Sciences
> *The University of The West Indies
> St. Augustine Campus*
>
> *Trinidad & Tobago, W.I.*
> T: (Office) 868-662-2002 ext 82231
> T: (Mobile) 868-329-8401
>
> E: mike.rutherford at sta.uwi.edu <mailto:mike.rutherford at sta.uwi.edu>
>
> S: mike.g.rutherford
>
>
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-- 
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-Storage
Münchhausenstr. 21
81247 München

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

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Bavarian Natural History Collections
The Bavarian State Collection of Zoology
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