HOLIDAY TESTING

This test method describes the procedure for determining holidays in epoxy coatings on ferrous materials. This method uses an electrical current that flows through a low resistance path and triggers an alarm (buzzer) when a holiday is detected. Holidays are defined as pinholes and voids in non-conductive coatings that allow current to pass through the protective coating to the metal base material. These discontinuities may not be visible to a person with normal or corrected vision