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A combination of ground wood pulp and resins pressed into 4×8' sheets, typically 1/8" or 1/4" thick. Hardboard comes in three grades: service, standard, and service-tempered (the best choice for shop use),use). with one smooth face or two,as shown, below. The material often goes by “Masonite,” the brand name used by
one manufacturer.
Another version of this material, known as perforated hardboard (or by the brand name Peg-Board), consists of a 1/4"-thick sheet with 1/8"- or 1/4"-diameter holes drilled at regular intervals. The holes receive hooks that are often used for tool storage.