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Friday, June 1 • 3:30pm - 4:00pm
27. (Research and Technical Studies) The Permeation of Vapors through Polyethylene terephthalate (PET) films

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Polyethylene terephthalate (PET) films, aka Mylar® or Melinex®, are widely used materials within conservation. One of the most common uses of these films is for encapsulation. Our studies have shown that water can permeate through the PET whereas formic acid vapor permeates at a much slower rate and acetic acid vapor permeates even more slowly, if at all. The rate of permeation is dependent upon the molecular diameter of the vapor. The varying rates of penetration have a two-fold impact. One, they can act as a protecting layer against some hazardous volatile compounds within polluted environments. Two, they can trap hazardous volatile compounds within enclosures, creating a microenvironment which maybe hazardous to cultural heritage objects.The data suggests that deacidification should be performed prior to encapsulation.

Speakers
avatar for Patricia McGuiggan

Patricia McGuiggan

Research Professor, Department of Materials Science and Engineering, Johns Hopkins University
Dr. McGuiggan obtained her Ph.D. in Chemical Engineering from the University of Minnesota. During her Ph.D., she was a research scholar in the Applied Mathematics Department at the Australian National University working with Richard Pashley. She spent 3 years as a postdoctoral fellow... Read More →

Co-Authors
avatar for Andrea Hall

Andrea Hall

Senior Research Specialist, Heritage Science for Conservation, Department of Conservation and Preservation, Sheridan Libraries and Museums, Johns Hopkins University
Andrea Hall is Senior Research Specialist at Heritage Science for Conservation in the Department of Conservation and Preservation at Johns Hopkins University where she is working on physical property testing of heritage materials, environmental monitoring, studying conservation testing... Read More →
avatar for Molly K. McGath

Molly K. McGath

Analytical Chemist, The Mariners' Museum and Park
Dr. Molly K. McGath is the Analytical Chemist at the Mariners Museum and Park with research focused on studying the deterioration of metals and organics from the marine environment, environmental monitoring, evaluation of past and current conservation treatments and methods, and the... Read More →
avatar for Bill Minter

Bill Minter

Senior Book Conservator, Pennsylvania State University Library
William “Bill” Minter is currently senior book conservator for The Pennsylvania State University Libraries. Previously, he worked with the post-doctoral fellows in the Heritage Science for Conservation group at Johns Hopkins University. And during this time, he has maintained... Read More →

Friday June 1, 2018 3:30pm - 4:00pm
Texas Ballroom (Foyer outside Ballrooms - Poster Session) Marriott Marquis Houston

Attendees (47)