Definitions for "Mat board"
Rigid mount board lined with a plain or decorated paper.
A heavy fiber, paper like board used to protect artwork. It enhances and showcases the subject being framed and should be of archival quality, acid free.
A colored paperboard material used to create a transition from the picture to the frame. Our Bainbridge mat board, which is 4-ply and 1/16" thick, is available in two collections: Papermat, which is used for general frame where a 100% acid free material is not needed, and Alphamat, our 100% acid free material for conservation framing. A full sheet of mat board is 32"x40".