board(redirected from arm board)
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a usually rectangular plate of a specific size made from an electrically insulating material that is used in electrical and electronic apparatus as a base for the positioning and mechanical attachment of electrical and electronic components. It may also be used for the application of printed components and for the electrical interconnection of the components by means of wire or printed circuits.
Boards must provide the best possible characteristics for mechanical and electrical strength, stability of geometric dimensions and electrical parameters, resistance to climatic and mechanical influences, and ease of machining. These requirements vary depending on the intended use of the board, the operating conditions, and the arrangement of components. Materials usually used for boards include laminated plastics (electrical Micarta, textolite, and fiberglass laminate), phenol plastics, fluoroplastics, and molding materials of the AG-4 type.