[Nhcoll-l] Supplier for silicone based gaskets for (herpetology) specimen jars
Fabian Neisskenwirth
info at naturhistorische-konservierung.de
Thu Feb 3 07:53:10 EST 2022
Dear Stevie,
I would recommend you to ask some plastics or rubber manufacturing
company if they can cut you a big batch with specific sizes. When I
worked in the Ruhr Museum in Essen I ordered a little batch of 150
gaskets made of fluorine rubber which is very resistant to both ethanol
an formaldehyde fumes (see attachment). The nice thing about letting
them be made by the company was that I could customize the size, the
material and all necessary characteristics. Usually the plastics come as
long rolls in different strengths, so the rubber manufacturer just cut
the rings out of the rubber "sheet". Ask some rubber manufacturers about
companies that could help, that's how I got through.
About the material:
There is a wide span of materials which are much better that silicone if
you want to contain ethanol. Silicone is permeable to ethanol. If you
are topping-up regularly, it should work fine, but the ethanol will
evaporate with time. Rubbers like EPDM or the Buna-O (which is NBR) that
Andy talked about are much more suitable for ethanol. The problem with
fluorine rubber (beside its price) is that it is very hard (arround
70-75° Shore) so its not very elastic, still it has worked out very well.
To Tonya´s question:
The same counts for the liners, silicone is in this case very resistant
to formaldehyde fumes, but I have not seen pure silicone cap liners
anywhere and it will let ethanol escape at some point. The GLS 80 jars
from Duran have a new special cap with a silicone/PTFE coated liners
that work incredibly good, but they only fit on that jars:
https://www.dwk.com/duran-pure-gls-80-screw-cap
Since Duran makes very good borosilicate jars, I would strongly
recommend to have this in mind. At a certain amount, it would be
possible to manufacture some batch of jars without any filling markers.
As I was informed 3 years ago.
Hope this helps, all best to both of you!
Am 03.02.22 um 03:10 schrieb Haff, Tonya (NCMI, Crace):
>
> Hi all,
>
> On this topic, I am wondering if any of you have used silicone liners
> for jars containing specimens in ETOH/formalin? I know that silicone
> holds up better over time than rubber, but is it preferred over PTFE
> or F217, if given the choice?
>
> Cheers,
>
> Tonya
>
> *From:*Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> *On Behalf Of
> *Bentley, Andrew Charles
> *Sent:* Thursday, 3 February 2022 10:41 AM
> *To:* Kennedy-Gold, Stevie <Kennedy-GoldS at CarnegieMnh.Org>;
> nhcoll-l at mailman.yale.edu
> *Subject:* Re: [Nhcoll-l] Supplier for silicone based gaskets for
> (herpetology) specimen jars
>
> Stevie
>
> We have been using buna-n durometer gaskets for our Le Parfait and
> other gasketed jars for some time now. We order from Manufactured
> Rubber Products in Philadelphia (not sure if this is the same company
> you referenced) but must admit that we have not ordered in some time
> (we still have a large supply of various sizes). We use these to
> replace the regular red rubber gaskets that do not hold up under
> alcohol conditions. They function great even though we are slowly but
> surely moving away from gasketed jars to jars purchased from O’Berk -
> https://www.oberk.com/containers/glass/glass-jar. We order 8oz, 16oz,
> 32oz, 64oz, half gallon and gallon jars with
> polypropylene/polyethylene lids as attached.
>
> Hope that helps. Happy to answer any further questions.
>
> Andy
>
> A : A : A :
>
> }<(((_°>.,.,.,.}<(((_°>.,.,.,.}<)))_°>
>
> V V V
>
> Andy Bentley
>
> Ichthyology Collection Manager
>
> University of Kansas
>
> Biodiversity Institute
>
> Dyche Hall
>
> 1345 Jayhawk Boulevard
>
> Lawrence, KS, 66045-7561
>
> USA
>
> Tel: (785) 864-3863
>
> Fax: (785) 864-5335
>
> Email: abentley at ku.edu <mailto:abentley at ku.edu>
>
> http://ichthyology.biodiversity.ku.edu
> <http://ichthyology.biodiversity.ku.edu/>
>
> A : A : A :
>
> }<(((_°>.,.,.,.}<(((_°>.,.,.,.}<)))_°>
>
> V V V
>
> *From: *Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> on behalf of
> "Kennedy-Gold, Stevie" <Kennedy-GoldS at CarnegieMnh.Org>
> *Date: *Wednesday, February 2, 2022 at 3:47 PM
> *To: *"nhcoll-l at mailman.yale.edu" <nhcoll-l at mailman.yale.edu>
> *Subject: *[Nhcoll-l] Supplier for silicone based gaskets for
> (herpetology) specimen jars
>
> Hello all,
>
> The herpetology section is looking for a reliable supplier for
> silicone based gaskets. We use various sized glass Le Parfait jars to
> house our wet (70% ethanol) specimens. We previously purchased from
> Philly Rubber, but I have not received any replies to my recent
> inquiries. I would be extremely grateful for any recommendations for
> reasonably priced, reliable gasket suppliers!
>
> Thank you in advance! Responses can also be sent off-list.
>
> Stevie
>
> *//*
>
> *Stevie Kennedy-Gold*(she/her/hers)
>
> Collection Manager of Section of Amphibians and Reptiles
>
> Carnegie Museum of Natural History
>
> 4400 Forbes Ave.
>
> Pittsburgh, PA 15213
>
> Phone: (412) 353-4690
>
> Email: kennedy-golds at carnegiemnh.org//
>
> Due to the ongoing COVID-19 pandemic, the section has limited
> personnel available working onsite. As such, *only* return loans with
> prior notification. Thank you for your cooperation, and apologies for
> any inconvenience.
>
>
>
>
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