millboard

He was referring to the value of asbestos millboard as a lining for fireproof cases and deed boxes.

A strong, smooth piece of cardboard called millboard is taken, and the edges rubbed down with glass paper.

Cut a piece of millboard, celluloid, or even thin wood the same size, and upon this paint an attractive design.

These evil results may always be minimized by placing a piece of millboard between the culprit and his victim.

The backing of a flat piece of soft wood with an interleaving of stout paper or, better still, millboard, must not be forgotten.