[Nhcoll-l] Question about jar grease in fluid collections

[Neisskenwirth, Fabian]

Dear Esther,

Sorry for the late answer.

It seems that there is no real study about the effects of Vaseline sealing’s… It all comes from experience. So here I can share mine.

For the projects I was working on in Bern (about 4000 Jars) I used the Vaseline you asked about, its  medical quality, like Joachim suggested.

I use heated stoppers to close the jars (at around 70-90 °C, depending on the size), so after cooling down they build up a little vacuum in the jar that helps for a much better sealing. The Vaseline spreads evenly on all the surface of the grounding on the stopper so it’s very easy to see if its seal is tight. If the stopper is not fitting, don’t use it… it’s never going to make a good seal, specially on old Jars.

This is why I don’t use Alrisol, it does not spread with heat, and yes, it is pretty expensive. But if you close the jars without heat it makes a great sealing, like Dirk said. And has a much better adhesion that pure Vaseline, finally it was developed exactly for this purpose.

So I would rather point out that it depends on the sealing method you are using.

Hope this helps you.


Greeting from Essen,


--
Fabian Neisskenwirth
Naturwissentschaftlicher Präparator
MA Student Restaurierung und Konservierung von Kulturgut

+49 (0) 201 24681 470
Stiftung Ruhr Museum
Fritz-Schupp-Allee 15
45141 Essen
www.ruhrmuseum.de<http://www.ruhrmuseum.de>

Von: Nhcoll-l [mailto:nhcoll-l-bounces at mailman.yale.edu] Im Auftrag von Esther Dondorp
Gesendet: Donnerstag, 27. Februar 2020 15:32
An: nhcoll-l at mailman.yale.edu
Betreff: [Nhcoll-l] Question about jar grease in fluid collections

Dear all,

Just a short question - we always use vaseline to seal gound jar stoppers, now that we cannot use our old supplier anymore the support department ordered the commercial vaseline petroleum jelly like this<https://www.drogisterij.net/verzorging/lichaamsverzorging/lichaamsverzorging-verzorging/creme/vaseline-petroleum-jelly-original-42182634?partnercode=222&gclid=EAIaIQobChMIiOnM3_fx5wIVWeN3Ch1X_wOHEAQYASABEgJTI_D_BwE> one. I was wondering if we can use it or that it has additional additives that can effect the balance inside the jar. Is there an acid free or other alternative? Wondering what other people use!

Many thanks,




Esther Dondorp
Senior Collectiebeheerder
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