[NHCOLL-L:4417] RE: FW: Re: Lids for glass jars
Andrew Cabrinovic
a.cabrinovic at nhm.ac.uk
Fri Jul 31 09:02:02 EDT 2009
Hi Andy,
I do understand your situation but I don't think you'll find the price difference quite as great as you think. Dixon have been recently producing a new range of jars which are significantly cheaper than before ; anyway, I have forwarded them your comments and they may wish to provide further information on their glassware.
Best regards,
Andrew.
________________________________
From: Bentley, Andrew Charles [mailto:abentley at ku.edu]
Sent: 31 July 2009 02:57
To: Andrew Cabrinovic; NHCOLL-L at lists.yale.edu
Subject: RE: [NHCOLL-L:4413] FW: Re: Lids for glass jars
Andrew
These are indeed the gold standard of jars for wet collections - if you can afford them. These jars are an order of magnitude more expensive than similar sized jars that we purchase from KOLS containers with polyethylene/polypropylene lids here in the States. And with shipping that price jumps even further beyond our reach.
Wish I could afford them but we are very happy with the jars we are using now - nice variety of sizes from 4oz to 1 gallon and the lids (after about 10 years of use hold up well under exposure to both formaldehyde and alcohol and form a good evaporation proof seal.
Andy
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Andy Bentley
Ichthyology Collection Manager
University of Kansas
Natural History Museum & Biodiversity Research Center
Dyche Hall
1345 Jayhawk Boulevard
Lawrence, KS, 66045-7561
USA
Tel: (785) 864-3863
Fax: (785) 864-5335
Email: ABentley at ku.edu :
: :
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________________________________
From: owner-nhcoll-l at lists.yale.edu on behalf of Andrew Cabrinovic
Sent: Thu 7/30/2009 7:28 AM
To: NHCOLL-L at lists.yale.edu
Subject: [NHCOLL-L:4413] FW: Re: Lids for glass jars
Dear All,
Just a reminder that you can obtain glass jars with glass lids! Surely the most stable option available for long term storage.
We use a company called Dixon Glass that provide us with a great range of ground glass jars, in all sorts of diameters and heights.
I believe they are very happy to supply on an international basis.
Dixon Glass
127-129 Avenue Road
Beckenham
Kent BR3 4RX
U.K.
Contact : Ms D (Debbie) Little
Fax : 020 8 778 1270
Tel : 020 8 778 6458
Email : dixon at dixonglass.co.uk
Home page :
http://www.dixonglass.co.uk/
Best regards,
Andrew.
Mr Andrew Cabrinovic,
Lower Invertebrates Curation Group
Department of Zoology
DC1 - floor 5
The Natural History Museum
Cromwell Road
London SW7 5BD
UK
tel : (+44) (0)20 7 942 6447
fax : (+44) (0)20 7 942 5054
email : adc at nhm.ac.uk
web : http://www.nhm.ac.uk//research-curation/staff- directory/zoology/cv-5528.html <http://www.nhm.ac.uk/research-curation/staff-%20directory/zoology/cv-5528.html>
-----Original Message-----
From: owner-nhcoll-l at lists.yale.edu [mailto:owner-nhcoll-l at lists.yale.edu] On Behalf Of Dirk Neumann
Sent: 30 July 2009 07:40
To: simmons.johne at gmail.com
Cc: patricia.gegick at state.nm.us; NHCOLL-L at lists.yale.edu
Subject: [NHCOLL-L:4412] Re: Lids for glass jars
Depending on the fixation of your specimens, I would be careful with the
resin-lined caps. Like with Bakelite, the problem is not the
preservation fluid, but the fixative formalin (the paraformalin-polymer
Bakelite is corroded by residual formaldehyde dissolving from the
specimens and then evaporating from the preservation fluid). The same is
likely to happen with synthetic resines, e.g. epoxy resine /
polyurethane resine / unsaturated polyester resine, since all of them
are polymerisation-polyaddition or polycondensation products with
chemically instable chemical bonds in the long run .
Same applies for polar plastic polymers like polyvinyl chloride and
plastics with a high amount of softeners; those lids will loose their
softeners quite soon and as a result they will get stiff and brittle.
PE & PP are quite stable against many chemicals, it would be surely the
best option you have.
You may also consider commercial twist-off glasses with metal lids;
normally, there are two types of lids, one for fatty ingredients, one
for sour / acidic (like mixed pickles). The latter ones have a thicker
PE liner inside the lid which prevents the lid from rusting too fast.
Since sizes of most of these lids are ISO-standardised, it should be
possible to replace them the next decades (hopefully). Compared to the
plastic lids in our collection, we didn't have any problems with the
metal lids the last 15 years. The observed problems with the plastic
lids however, is mainly based on the denaturing agent added to our
magazine alcohol, and not on the ethanol itself.
Hope this helps
Dirk
John E Simmons schrieb:
> 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 <mailto: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
> <mailto:patricia.gegick at state.nm.us>
>
>
>
>
> Confidentiality Notice: This e-mail, including all attachments is
> for the sole use of the intended recipient(s) and may contain
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> provided under the New Mexico Inspection of Public Records Act. If
> you are not the intended recipient, please contact the sender and
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>
> --
> John E. Simmons
> Museologica
> 128 E. Burnside Street
> Bellefonte, Pennsylvania 16823-2010
> simmons.johne at gmail.com <mailto:simmons.johne at gmail.com>
> 303-681-5708
> www.museologica.com <http://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 <mailto:jes67 at psu.edu>
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