● Conductor resistance. Conductor resistance test instrument was used to measure and then the values at 20℃ were compared.
● Insulation breakdown voltage. Twist two strands of copper enameled wire and apply a voltage between their conductors to judge by the damage voltage of the paint film. The performance is analyzed and judged through two tests of normal and cold breakdown voltage.
● Film continuity (pinhole). Check paint film pores with a certain length of test material. The project is tested by a high-pressure paint film continuity tester.
● Flexibility (flexibility). When winding or elongating, whether the paint film is cracked or pinhole is determined.
● Tightness. Through the rapid tensile test, the paint film should be cracked during rapid tensile.
● Wear resistance. When the paint film is abraded by an abrasion tester, it is abraded to the number of times the conductor is seen or the abrasion damage value, and the performance is carried out by a scratch-resistant paint tester.
● Aging resistance. When heating under specified conditions, whether pinholes or insulation failure voltage values are generated in the paint film shall be analyzed.
● Softening resistance. The crossed copper enameled wire is heated under specified conditions, and after being electrified, the temperature value with or without short circuit or occurrence of short circuit is determined. Or twist two strands of copper enameled wires and heat them under specified conditions, depending on whether the paint film is abnormal.
● Thermal shock resistance. When stretching or winding, heat under specified conditions, depending on whether the paint film is cracked.
● Solvent resistance, chemical resistance and oil resistance. When immersed in solvent, medicine or insulating oil, the state of paint film shall be expressed by nail method or pencil method.
● Direct weldability. According to the specified conditions of temperature and solder, depending on whether the solder is evenly attached.
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