[NHCOLL-L:4411] Re: Lids for glass jars

[John E Simmons]

What sizes of jars are you looking for lids for?

I don't know what "pulp/vinyl" lids are either, but it might be worth asking
the manufacturer.  It may just be another version of polyvinyl chorlide
lids, which you don't want.

Polyethylene lids are fine if your lighting is UV shielded and you avoid
exposing the lids to sunlight, but the low-density PE lids may allow too
much oxygen permeance.

The "fluoropolymer resin-lined caps" sounds like it is probably a rigid lid
(similar to bakelite). What you want is a lid that is slightly flexible (so
that it will conform to the irregularites of the jar and be more resistant
to backing-off) and a soft enough liner that you can tighten the lid down
sufficiently.  I would avoid the rubber lined caps as the rubber (if real
rubber) will have a very short lifespan.

You might consider asking for samples of the various types of lids.  You can
test the plastic yourself for the presence of chlorides to eliminate the PVC
lids and you can get a better assessment of how well the liners are likely
to hold up.



On Mon, Jul 27, 2009 at 11:12 AM, Gegick, Patricia, DCA <
patricia.gegick at state.nm.us> wrote:

>  Dear List,
>
> I am attempting to purchase glass jars for alcohol storage of freshwater
> gastropods and bivalves.  In reviewing my file on containers, I note the
> following:
>
>         Some museums like TEF lined lids
>         Polystyrene lids are good if not exposed to benzene rings
>         Polyethylene is good if not exposed to UV light
>         “Bakelite” lids are not good
> My mollusk reference suggests polypropylene lids with polyethylene liners
>
> The lid options I have are:
>         Pulp/vinyl (don’t know what a “pulp” lid would be)
>         Solid PE (polyethylene) lids
>         PTFE/LDPE  Poly-tetrafluoroethylene lids with low density
> polyethylene liners
>         Fluoropolymer resin-lined caps
>         Polyvinyl-lined caps
>         Rubber-lined caps
> PTFE-Faced LDPE Foam-lined Caps
>
> Can anyone tell me if the PTFE lids would be appropriate and similar to
> polypropylene lids?  Also what is “resin lined” and will 70-80% alcohol
> affect this?  Thanks.
>
>
> Patricia J. Gegick
> Bioscience Collections Manager
> Department of Collections and Research
> New Mexico Museum of Natural History & Science
> 1801 Mountain Road, NW
> Albuquerque, NM  87104-1375
> Phone:  505.841.2867  Fax: 505.841.2866
> email:  patricia.gegick at state.nm.us
>
>
>
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-- 
John E. Simmons
Museologica
128 E. Burnside Street
Bellefonte, Pennsylvania 16823-2010
simmons.johne at gmail.com
303-681-5708
www.museologica.com
and
Adjunct Curator of Collections
Earth and Mineral Science Museum & Art Gallery
Penn State University
19 Deike Building
University Park, Pennsylvania 16802-2709
jes67 at psu.edu
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