ASTM D229Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation
ASTM D229 is a test method, which provides useful engineering information for evaluating the mechanical behaviour of rigid electrical insulation at elevated temperature. Rigid electrical insulation is generally used as terminal boards, spacers, voltage barriers, and circuit boards. When the proper exposure and test temperatures are chosen, depending on the material and end-use operating temperature, use the test method as one means of indicating relative thermal degradation of rigid insulating materials.
Before conducting ASTM D229, it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.