1. Combustion resistance refers to the ability of insulating materials to resist burning when in contact with flames or to prevent continued burning when away from flames. With the increasing application of insulating materials, the requirements for their combustion resistance are becoming more important. People use various means to improve and enhance the combustion resistance of insulating materials. The higher the combustion resistance, the better its safety.

2. Arc resistance refers to the ability of insulating materials to withstand arcing along their surface under specified test conditions. During the test, AC high voltage and low current are used to generate an arc between two electrodes. The time required to form a conductive layer on the surface of the insulating material is used to judge the arc resistance of the insulating material. The longer the time value, the better the arc resistance. 

3. The sealing degree is better for oil and water sealing and isolation.

4. Breakdown voltage and electrical strength When an insulating material is damaged under a strong electric field, it loses its insulation properties and becomes conductive, which is called breakdown. The voltage at the time of breakdown is called breakdown voltage (dielectric strength). The electrical strength is the quotient of the voltage when breakdown occurs under specified conditions and the distance between the two electrodes that bear the external voltage, that is, the breakdown voltage per unit thickness. For insulating materials, the higher the breakdown voltage and electrical strength, the better.

5. Tensile strength is the maximum tensile stress that a specimen withstands during a tensile test. It is the most widely used and representative test for mechanical properties of insulating materials.

6. Insulation resistance and resistivity Resistance is the reciprocal of conductivity, and resistivity is the resistance per unit volume. The less conductive a material is, the greater its resistance is, and the two are in a reciprocal relationship. For insulating materials, it is always hoped that the resistivity is as high as possible. 

7. Relative dielectric constant and dielectric loss tangent: mutual insulation of various components of the electrical network and dielectric (energy storage) of capacitors. The former requires a small relative dielectric constant, the latter requires a large relative dielectric constant, and both require a small dielectric loss tangent, especially for insulating materials used at high frequencies and high voltages. In order to reduce dielectric loss, insulating materials with small dielectric loss tangent are required.