Development of rapid track testing procedures

The recent development of new alumina filled, highly track resistant insulating materials has focused attention on the new ASTM "Suggested Method of Test for Dust and Fog Tracking Resistance of Electrical Insulating Materials", which unfortunately requires 200 to 1000 hours to evaluate the better materials of this class. The required long duration of the test has been a serious limitation in the development of improved materials and in the quality control of these materials.