Kelli,
I am not aware of a standard. Choose based upon what you want to
accomplish. As per a previous response, generally choose thicker when more
strength is needed. Also choose thicker when you want to isolate the object
inside more thoroughly form the exterior environment. The thicker the bag,
the more time required for permeation in or out of the bag. For purposes of
this discussion, it can be considered to be a linear relationship - twice
the thickness is twice the time for permeation. Permeation includes
moisture, so the thicker the bag, the more slowly the interior moisture
level will change in relationship to that outside the bag. Thus, thick bags
will better moderate daily or weekly environmental fluctuations than thin
ones, and will slow the effect of pollutant intrusion from the exterior.
However, if pollutants arise inside the bag from the object itself, they
will be dissipated to the exterior more slowly in a thick bag.
Marc
American Conservation Consortium, Ltd.
4 Rockville Road
Broad Brook, CT 06016
www.conservator.com
860-386-6058
*Collections Preservation Consultation
*Conservation Assessments & Surveys
*Low-Tech Environmental Control
*Moisture Management Solutions
*Collections in Historic Structures
*Collections Care Grant Preparation
*Conservation Treatment of:
Furniture
Painted Wood
Horse-Drawn Vehicles
Architectural Interiors
Marc A. Williams, President
MS in Art Conservation, Winterthur Museum Program
Former Chief Wooden Object Conservator, Smithsonian Institution
Fellow, American Institute for Conservation (AIC)
----- Original Message -----
From: "Kelli Bacon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 13, 2007 4:27 PM
Subject: -- Spam --[MUSEUM-L] artifact bag thickness
> For my second question of the day, when bagging artifacts (of any kind)
> for
> storage, is there a museum standard for the thickness of the bag? 2mm,
> 3mm,
> 4mm, etc.? Thanks again for any responses.
>
> Kelli
>
> *********************************
> Kelli Bacon
> Nebraska State Historical Society
> 1500 R St.
> PO Box 82554
> Lincoln NE 68501-2554
> 402-471-4766
> [log in to unmask]
> www.nebraskahistory.org
>
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