1.1 This test method provides a procedure for evaluating thermal endurance of coating powders by determining the length of aging time at selected elevated temperatures required to achieve dielectric breakdown at room temperature at a pre-determined proof voltage. Thermal endurance is expressed in terms of a temperature index. 1.2 This test method is applicable to insulating powders used over a substrate material of steel.
The purpose of this document is to provide a method for determining the thermal endurance of coating powders applied over a copper or aluminum substrate material. There is no ASTM method addressing this type of test or this type of rating, which is commonly needed and used within the industry.
Keywordspowder coating; dielectric breakdown voltage; temperature index; thermal endurance; integral bus bar; thermal endurance graph; thermal life; thermal life curve
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as D7895/D7895M-2014 and Pending Publication