[Nhcoll-l] borosilicate glass

Wed Oct 28 08:10:54 EDT 2015

Hello Heidi,

stoelzle oberglass has a branch in North America if I am not completely 
wrong. They produce high quality ground stopper jars, but available 
sizes are limited and designed to hold larger specimens instead of small.

There are different qualities of soda-lime glass; for example, most 
glass containers used in chemical laboratories are soda-lime and inert, 
because of a special coating of the glass surface. This glass quality is 
called "neutral glass" sometimes (e.g. used for pharmaceutical jars 
which are also available as clear glass).

Uncoated soda-lime glass has the problem that dissolving ions create a 
highly reactive (basic) surface which could harm specimens. But this is 
rather an issue of specimen size in relation to contact surface, e.g. 
dozens of small insects sitting in a small soda-lime tube have a large 
contact surface, while a big trout in a large soda-lime jar has a 
comparatively small contact surface.

In terms of long term stability, ground-stopper borosilicate jars are 
surely more durable than borosilicate twist-off jars; the lid of the 
latter will likely fail before the glass starts to corrode.

Regarding DNA-storage in small glass tube, I have no personal 
experience, but would definitely choose a certified high quality tube. 
Problem here again is the lid; I have tested some PE-tubes with 
different lids (inner thread /outer thread, silicon caulking or not, 
etc.) and many failed. As far as I know, there are no studies on the 
effects of softeners (plastic tubes) or ions (glass tubes) leaching and 
(negatively) affecting DNA quality.

Hope this helps,
Dirk

Am 27.10.2015 um 22:52 schrieb Gartner, Heidi RBCM:EX:
>
> Hello All!
>
> I am looking to source some storage jars for our fluid preserved 
> invertebrate collection at the RBCM.  I understand that borosilicate 
> glass is optimal for use in museum work as it can withstand greater 
> physical, chemical, and temperature stress.  However, I am having 
> difficulties sourcing borosilicate jars in the sizes I need.  It seems 
> most jars sold are either flint or soda-lime glass.  So I am hoping 
> the group can help answer the following questions:
>
> ·Do you have a good supplier in North America for a wide range of 
> borosilicate jar sizes?
>
> ·What are the long term effects of using flint or soda-lime glass?  
> (e.g. Greater risk to general handling? Any chemical reactions that 
> may affect DNA work?)
>
> Thank you for your time,
>
> *______________________________________________________________________________________________*
>
> *Heidi Gartner *Collection Manager, Invertebrates  |  Collections, 
> Knowledge and Engagement
>
>
> 675 Belleville Street, Victoria, BC Canada V8W 9W2
> T 250 387-2932
> HGartner at royalbcmuseum.bc.ca <mailto:HGartner at royalbcmuseum.bc.ca>| 
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-- 
Dirk Neumann

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---------

Dirk Neumann

Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de

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The Bavarian State Collection of Zoology
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