[NHCOLL-L:5628] RE: Gaskets for wet collection vats

Mon Sep 5 05:01:24 EDT 2011

Hi all,

eben though I don't know the exact design of the steel tanks Andy 
suggested, the colleagues in Berlin invented steel tanks for their large 
specimens when rebuilding their alcohol collections. Basically, these 
are steel tanks as used for catering in factory canteens. Inside the lid 
there is a steel rim which leads condensing evaporates back into the 
container to prevent direct contact of the condensing evaporates with 
the gasket. The gasket (don't know exact material or composition, sorry) 
is on the outside of the container, which closes hermetically. All 
together a very nice design, but not cheap ...

However (and depending on the denaturing agent) fibreglass will not be 
resistant against alcohols in the long run and tend to crack sooner or 
later.

Sealing crumbeling gaskets of  Le-Perfait glass with vacuum grease (no 
silicon grease ...) works, but these are smaller of course then your 
vats and are not closed with bolts. Perhaps worth trying if you have 
high quality grease (not soft white which attracts alcohol evaporates 
then swells and starts runing)

Sorry,  only a further contributions and ideas which offers no direct help.

All the best
Dirk

Am 02.09.2011 21:00, schrieb Bentley, Andrew Charles:
>
> Moretta
>
> We recently went through a major tank overhaul here at KU and I 
> contacted both Delta Designs and Steel Fixtures in Topeka -- we use 
> stainless steel tanks manufactured by them.  Bruce Danielson from 
> Delta sent me a replacement gasket for our tanks that is a 3M product 
> (do not know the name) which is sticky backed.  We have not had any of 
> these in long enough to know if they are a viable replacement i.e. 
> whether they hold up any better to alcohol or oils than the original, 
> but it may be worth contacting him to see what it the product is.  
> Maybe you could then contact 3M to find out the properties of the 
> material and whether it would hold up or if they have anything that 
> would.  I would have done this myself when I first got them but this 
> got pushed onto the back burner like so many other things.
>
> Bruce's email address is bdanielson at deltadesignsltd.com 
> <mailto:bdanielson at deltadesignsltd.com>.
>
> Andy
>
>     A  :             A  :             A  :
>  }<(((_°>.,.,.,.}<(((_°>.,.,.,.}<)))_°>
>     V                V                V
>  Andy Bentley
>  Ichthyology Collection Manager
>  University of Kansas
>  Natural History Museum & 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>        :
>                            :                 :
>     A  :             A  :             A  :
>  }<(((_°>.,.,.,.}<(((_°>.,.,.,.}<)))_°>
>     V                V                V
>
> *From:* owner-nhcoll-l at lists.yale.edu 
> [mailto:owner-nhcoll-l at lists.yale.edu] *On Behalf Of *Frederick, 
> Moretta RBCM:EX
> *Sent:* Friday, September 02, 2011 1:02 PM
> *To:* 'NHCOLL-L at LISTS.YALE.EDU'
> *Subject:* [NHCOLL-L:5619] Gaskets for wet collection vats
>
> I need to find a replacement for the gaskets lining the lids of our 
> fluid storage vats, and am interested in hearing what materials others 
> are using to seal their large storage containers, as well as 
> suggestions for suppliers in North America.
>
> We are looking to seal two types of vats, both of which are used to 
> store fish or invertebrate specimens in ethanol or isopropanol.  The 
> vats are not opened often (~2-10 times a year), and the material used 
> will need to prevent evaporation as well as hold up well against 
> alcohol fumes and fish oil.  Ideally, we would like to find something 
> with a peel and stick side so it can be attached directly to the lid.
>
> Our larger vats (4'x6') are fiberglass with flat mating lips, held 
> closed with through bolts every 12" or so.
>
> Our smaller vats are HDPE, about 3'x4' with a gravity sealed lid that 
> slips over the vat and has a groove in it to hold the gasket. We are 
> hoping to create a tighter seal on these vats with strapping. The 
> groove is about 1/2" in diameter and previous gaskets were simply 
> stuffed into this space with no adhesive.  We have found however that 
> over time these gaskets slip out, falling into the vat, so we are 
> hoping to find something that we can adhere inside the groove.
>
> Thanks for any advice you can give me!
>
> Cheers,
>
> Moretta
>
> *______________________________________________________________________________________________*
>
> *Moretta Frederick * Collections Manager, Invertebrates, Fish, 
> Amphibians, Reptiles  |  Natural History
> Description: https://sales.royalbcmuseum.bc.ca/logo.jpg
> 675 Belleville Street, Victoria, BC Canada V8W 9W2
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-- 
Dirk Neumann

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

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---------

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

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