Here is some more information from previous conservation list posting with
respect to Mylar Type D being discontinued by Dupont and some sources and
substitutes for it.
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Date: 20 Jun 2001
From: Bill Minter <[log in to unmask]>
Subject: DuPont Mylar Type D

Polyester Film for Encapsulation has been going through some major
changes within the past few years. A few years ago the ICI Melinex
line of film was purchased by the DuPont Corporation. I thought that
the Melinex line would be dropped. However, Melinex Type 516 has
lived on at DuPont. Now, there is new information from DuPont, that
Mylar Type D will be discontinued as of September 2001. Mylar Type D
had been developed for the Graphic Arts Industry. They are now using
computers for most of their work so there is little call for Mylar
D.

According to DuPont, converters/our suppliers have been alerted to
the discontinuation of Mylar D and they have "developed a game
plan". Melinex Type 516 and another similar film, 456, should be
readily available for use in preservation. Those of you who use
DuPont Mylar Type D should contact your supplier for new
information.

I will try to gather more information as it comes available.

Bill Minter
William Minter Bookbinding and Conservation, Inc.
4364 Woodbury Pike
Woodbury, PA   16695
814-793-4020
Fax: 814-793-4045

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Date: 21 Nov 2001
From: Mark Vine <[log in to unmask]>
Subject: Substitute for Mylar Type D

I read with interest the comments of Randy Silverman about a
replacement for Mylar Type "D" due to its apparent demise.

Here in England we secured very many tonnes of "D' grade earlier in
the year for future use along with ICI/Dupont's grade '516' in both
75 and 100 micron (3 and 4 mil).

As far as I am aware our opposite number in Springfield, Virginia
(telephone Kathy on 800-634-6932) have excellent stocks of these and
other Dupont archival quality thicknesses for future business.

Mark Vine
Conservation Resources (UK) Ltd
Fax: +44 1865 747035
+44 1865 747755

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Iona McCraith
Archives Association of Ontario
Preservation Consultant
Bethany, Ontario
Tel: (705) 277-1309
Fax: (705) 277-2091
e-mail: [log in to unmask]