IEC Ball Pressure Temperature (BP)球壓力溫度 - in accordance with IEC 695-10-2, is expressed as the temperature (in degrees C) where a 5mm diameter ball causes a 2mm diameter or less impression on the material surface.

The above characteristics and dielectric strength, volume resistivity and other electrical and mechanical properties may be determined by means of the applicable ASTM and/or UL specification in the Underwriters Laboratories Inc. Standard for Polymeric Materials-Short Term Property Evaluations, UL746A. In addition to minimum electrical and ignition test levels, materials which are used in applications involving support or contact with current-carrying parts are also required to display a minimum stability (heat distortion, moisture resistance, dimensional stability and mold stress) performance level, as described in the Underwriters Laboratories Inc. Standard for Polymeric Materials-Use in Electrical Equipment Evaluations, UL746C.

To determine compliance of a material for a specific application, the test values generated for that material should be compared with the minimum performance level established for that application as outlined in the product standard.