A method of testing giving a graphic display of insulation plastic flow information

Film insulated magnet wires and all plastics, deform, flow away, or even evaporate as a function of heat and pressure. MIL-W-583, its predecessors, several NEMA specifications, and most sales literature describe a cut-through test performed in a well-known manner. Various and numerous burnout tests are also being studied. The tool motor industry has developed burnout tests with actual tools. Unfortunately, with each aforementioned test, a single end point is reached. With this new test, a varying pressure is studied versus a constant temperature, and the resulting data plotted on rectangular co-ordinate. A broader interpretation of plastic flow information is thereby obtained.