[Nhcoll-l] Heatsealer

[Anderson, Gretchen]

Hi again Lennart,

We freeze herbarium sheets at -20 C.   Length of time is usually a week or two, just to be sure of the death rate. The sheets are wrapped in two layers of plastic (or two polyethylene trash bags(clear) for the reasons in my last email. We do a single freeze.  A double freeze as you described puts the specimens at greater risk and is no more effective at killing insects. In fact a double freeze can encourage the pest to develop freeze resistance.

Hope this helps.
Gretchen

Sent from my iPhone

On Jan 21, 2021, at 7:52 AM, Anderson, Gretchen <AndersonG at carnegiemnh.org> wrote:

 To add to what Marianna and Rachael said- put 2 layers of plastic over the specimens, if possible. The plastic is there to 1) eliminate stress from change in Relative humidity and the shock of losing moisture in the specimen &2) prevent condensation after on the specimen.

Gretchen Anderson
Conservator
CMNH

Sent from my iPhone

On Jan 21, 2021, at 1:45 AM, Lennart Lennuk <Lennart.Lennuk at loodusmuuseum.ee> wrote:


Hi!

Thank you a lot. This has been great help!

I believe I plan also some low-ogygen treatments. So what kind on heat-sealer to use and does it need 3-phase electricity?

Best!
Lennart

From: Mariana Di Giacomo [mailto:maru.digi at gmail.com]
Sent: Wednesday, January 20, 2021 6:17 PM
To: rachael at amartconservation.com
Cc: Lennart Lennuk <Lennart.Lennuk at loodusmuuseum.ee>; Nhcoll-l at mailman.yale.edu
Subject: Re: [Nhcoll-l] Heatsealer

Hi Lennart,

I have to second Rachael's comments. Make sure you are not leaving any holes while you are doing the taping and the specimens will be well protected before going into the freezer. The difference between freezer and low oxygen in this sense is that in both cases if you see the hole, it's a problem, but microholes are a problem for low-oxygen but not an issue for freezing, so heat sealing is not necessary.

Best,
Mariana

Mariana Di Giacomo, PhD
Natural History Conservator, Yale Peabody Museum
Co-chair, Emerging Professionals Committee, SPNHC
Associate Editor, Collection Forum, SPNHC
Secretary/Communications APOYOnline



El mié, 20 ene 2021 a las 9:52, <rachael at amartconservation.com<mailto:rachael at amartconservation.com>> escribió:
Hello Lennart,
Obviously I cannot speak for anyone else, but the majority of colleagues I know who freeze specimens as a remedial pest measure wrap them in polyethylene plastic that is secured with packing tape rather than sealed with a heat sealer.  I know that some people have investigated which tapes do well in low-temperatures, but I have found that most good quality packing tapes will survive the process and keep the plastic sheeting in place.  This is in contrast, of course, to low-oxygen treatments where a good seal for the barrier films require a heat sealer of some type.
Sincerely,
Rachael


Rachael Perkins Arenstein
A.M. Art Conservation, LLC
Conservation Treatment, Preservation Consulting & Collection Management
Tel: 917-796-1764 (she/her/hers)
www.amartconservation.com<https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.amartconservation.com%2f&c=E,1,g8GJFg2AoaNyTgAIIVIwMCbhBKPjkCbTt54JPmzrTt4PRqFA4Kn3bbJyp5OGZT9tAqKkQ-gooZ0DnIeAyxqovDhtf1mEPYi4omqlPGlNsw,,&typo=1>
rachael at amartconservation.com<mailto:rachael at amartconservation.com>

From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu<mailto:nhcoll-l-bounces at mailman.yale.edu>> On Behalf Of Lennart Lennuk
Sent: Wednesday, January 20, 2021 3:51 AM
To: nhcoll-l at mailman.yale.edu<mailto:nhcoll-l at mailman.yale.edu>
Subject: [Nhcoll-l] Heatsealer

Hello!

What kind of heatsealers you use for sealing stuffed animals before sending them to freezers (getting rid of pests for example)?
Does the heatsealer need three-phase electricity?

Head!
Lennart

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