Images and text by Garry
Head, Circulating Collections Conservation,
University Libraries Preservation Department
Shown below are the various
types of board and card stock used in our lab.
This acid- and lignin-free
corrugated board maintains a pH of 8.0-9.5 and carries a 3% alkaline
buffer. It is available in two weights, both of which are available in
large (40" x 60") sheet sizes. The heavier (E-Flute) is used for the
construction of corrugated clamshell boxes. The lighter weight board
(B-Flute) works well for enclosures made with the automated boxmaking
machine, and also for the inner structures of built-up boxes.
This is a traditional material
used for binding books. It is available in a variety of thicknesses, and
the board we use most often here is .098" (about 2.5 mm) thick. It is
made of a dense card material, and its stiffness makes it ideal for use
in the casing of books. Like all the board we use, it has grain
This acid-free sheet material
is available in different thicknesses, which are measured in "points".
One point equals .001" (or 1/1000" or one thousandth of an inch). The gauges
we use are 10-point, 20-point, and 40-point. As a reference, the average
business card is normally made from 10- to 15-point stock. The 10-point
folder stock is the one we use the most here in our lab. It is used for
the inner enclosures of wrapper-type enclosures. 20- and 40-point stock
are most often used for the inner enclosures of larger structures such as
portfolio-type enclosures, and sometimes for applications such as the
construction of partitions within enclosures.
Gray/white board is generally
used in making enclosures. It has a somewhat glossy coating and unlike binder's board it is normally used bare rather than covered. It is also much more flexible than binder's board.
Due to these characteristics, it is not suitable to serve as the
boards of new cases for books.
Complete Treatments Manual Table of Contents