phase box

n. (also phased box) a simple, relatively inexpensive box designed to protect books, scrapbooks, albums, and similar items


The concept of the phase box, or phased box, came from the Library of Congress’s “phased” approach to preservation in the early 1970s under the leadership of Peter Waters. Don Etherington designed a temporary wrapper for books in need of conservation. A phase box is typically a four-flap enclosure in which the boards are creased so that they can be wrapped around the book and are held together with string or hook-and-loop fasteners. Such enclosures were originally envisioned to provide temporary protection but are now often used permanently to stabilize materials that will not receive conservation work.