[Nhcoll-l] [External] Re: Putty For Sealing Jars

Wed Jan 11 18:09:48 EST 2023

The grinding using carborundum 120grit on a lapping plate works well for uneven surfaces and for grinding out spalls in the surface of the jar top
Ensure that you mix the grit with water to make a grinding paste 

With all good wishes, Simon Moore. 
Sent from my iPhone

> On 11 Jan 2023, at 19:29, Dirk Neumann <d.neumann at leibniz-lib.de> wrote:
> 
> 
> You can grind this down, even dry, but I would be very careful with historic cylinders for two reasons (see Simon Moore doing this in John Simmon's Comprehensive Fluid Preservation book)
> 
> Depending on how the annealing and cooling temperature, there might be a a lot of tension inside the glass that could cause chipping or even cracking (especially if the glass shows signs of glass disease, i.e small hardly visible micro-cracks and fissures). Also, depending on how evenly the glass melt was blown free-hand or into the cast, the cylinder walls may be less then a millimetre especially around the jar neck. Tilting during grinding could lead to unwanted result or even injury.
> 
> When still in Munich, we gave the jars to a town-based company that did the grinding of even surface for us for small money. We also used this option to cut cracked historic battery jars short to just below the lower limit of the crack (shark cylinder converted into perfect container for starfish).
> 
> With best wishes
> Dirk
> 
> 
> 
>> Am 11.01.2023 um 16:45 schrieb Tacker, Christopher:
>> If you choose to grind them flat, the quickest and most aggressive way to do it is 120 grit on a glass plate. I even got lucky at the glass business - they had unclaimed thick glass that they just gave me. This is also fairly cheap in terms of supplies and time.
>> 
>> You could even get some wet/dry sandpaper at a hardware store. 
>> 
>> Chris Tacker, Ph.D., P.G.
>> Research Curator of Geology
>> North Carolina Museum of Natural Sciences
>> 11 West Jones St. | Raleigh, NC  27601
>> 
>> Emails to and from this address are subject to NC Public Records Law and may be disclosed to third parties.
>> From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> on behalf of Robert Waller <rw at protectheritage.com>
>> Sent: Wednesday, January 11, 2023 10:32:06 AM
>> To: James Maclaine <j.maclaine at nhm.ac.uk>; nhcoll-l at mailman.yale.edu <nhcoll-l at mailman.yale.edu>
>> Subject: [External] Re: [Nhcoll-l] Putty For Sealing Jars
>>  
>> CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam.
>> 
>> Hi James,
>> Not a complete answer, but something you might want to check on. Your mineralogy or geology prep labs might have equipment for grinding perfectly flat surfaces (for them, in advance of polishing). If so, they could quickly and easily grind your jar tops flat for you. If they don’t have the equipment then they may be able to point you to someone who does. A vibrating lap (https://kingsleynorth.com/16-inch-covington-vibrating-lap.html) might be ideal but even a rotating flat lap (https://arrowheadlapidarysupply.com/products/18-rotating-disc-flat-lap-model-18rl/2695/) would serve.
>> Whatever you choose to seal with, the a perfectly flat jar top is certain to improve the seal.
>> Rob
>> From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> On Behalf Of James Maclaine
>> Sent: Wednesday, January 11, 2023 7:09 AM
>> To: nhcoll-l at mailman.yale.edu
>> Subject: [Nhcoll-l] Putty For Sealing Jars
>>  
>> Dear all,
>>  
>> Happy New Year!
>>  
>> Hope someone can help with a large jar sealing question.  In the past we have used a kind of putty (made by Arboseal) to seal flat glass plates to the top of some of our largest jars and containers.  This was especially useful in the case of some of the older jars where the top is not completely flat and the putty could fill in the gaps.  It isn’t an ideal solution (and makes opening the jar a bit of a chore) and in some cases the putty has hardened and cracked but on the whole it has fairly effectively slowed down evaporation over several decades.   
>>  
>> However, in the cases where the old putty has to be replaced I can no longer find the same brand for sale online, so can anyone tell me where I can purchase something similar and reliable that I could use for this?  Or ideally, let me know of a better way of sealing a flat lid on an uneven jar top (please don’t suggest stretching parafilm over it!). 
>>  
>> As these are large containers for specimens that would be difficult to find alternative storage for (see attached), I’d like to keep using them if possible.  They would also be prohibitively expensive to replace.
>>  
>> Any suggestions would be much appreciated.
>>  
>> Cheers,
>>  
>> James
>>  
>>  
>>  
>> 
>> 
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> 
> -- 
> ****
>  
> Dirk Neumann
> Collection Manager, Hamburg
>  
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> -- 
> Stiftung Leibniz-Institut zur Analyse des Biodiversitätswandels
> Postanschrift: Adenauerallee 127, 53113 Bonn, Germany
> 
> Stiftung des öffentlichen Rechts;
> Generaldirektion: Prof. Dr. Bernhard Misof (Generaldirektor), Adrian Grüter (Kaufm. Geschäftsführer)
> Sitz der Stiftung: Adenauerallee 160 in Bonn
> Vorsitzender des Stiftungsrates: Dr. Michael Wappelhorst
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> _______________________________________________
> NHCOLL-L is brought to you by the Society for the Preservation of
> Natural History Collections (SPNHC), an international society whose
> mission is to improve the preservation, conservation and management of
> natural history collections to ensure their continuing value to
> society. See http://www.spnhc.org for membership information.
> Advertising on NH-COLL-L is inappropriate.
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