1. Higher insulation resistance and resistivity: Resistance is the reciprocal of conductance and resistivity is the resistance per unit volume. The smaller the conductivity of the material is, the greater its resistance is. The reciprocal relationship between them is always expected to be as high as possible for insulating materials.

2. Smaller relative dielectric constant and dielectric loss tangent: There are two applications of insulating materials: mutual insulation of various parts of the network and dielectric (energy storage) of capacitors. The former requires a relatively small dielectric constant, while the latter requires a relatively large dielectric constant. Both require a small dielectric loss tangent, especially for insulating materials used at high frequencies and high pressures. In order to reduce dielectric loss, a small dielectric loss tangent is required.

3. Sufficiently high breakdown voltage and electrical strength: under a strong electric field, the insulating material is damaged and the insulation property is lost and becomes conductive, which is called breakdown. The breakdown voltage is called the breakdown voltage (dielectric strength). Electrical strength is the quotient of the distance between the voltage and the two electrodes withstanding applied voltage when breakdown occurs under specified conditions, that is, the breakdown voltage withstanding per unit thickness. For insulating materials, the higher the breakdown voltage and electrical strength, the better.

4. Good Tensile Strength: It is the maximum tensile stress that the specimen bears in the tensile test. It is the most widely used and representative test of mechanical properties of insulating materials.

5. Strong combustibility: refers to the ability of insulating materials to resist combustion when contacting flame or to prevent continued combustion when leaving flame. With the increasing application of insulating materials, it is more important to require their combustibility. People improve and improve the combustibility of insulating materials by various means. The higher the combustion resistance, the better the safety.

6. It has excellent arc resistance: under the specified test conditions, the insulating material can withstand the arc action along its surface. In the test, the arc resistance of insulating materials is judged by the time required for the formation of conductive layer on the surface of insulating materials through the arc action between the two electrodes under AC high voltage and small current. The greater the time value, the better the arc resistance.

7. Better sealing: better sealing isolation for oil and water quality.