Key indicators of the performance of the insulation material

1, the insulation resistance and resistivity
The resistance is the reciprocal of the conductance, resistivity is the resistance per unit volume. The smaller the material is conductive, the greater the resistance, both the reciprocal resistivity of insulating materials always want the highest possible.
2, the relative dielectric constant and dielectric loss tangent
Insulating material for two purposes: electrically insulated from each other and the capacitor of each member of the network medium (energy storage). The former requires a relatively small dielectric constant, which requires a relatively large dielectric constant, and both require the dielectric loss tangent is small, the application of an insulating material, especially in high-frequency and high-pressure, so that a small dielectric loss, all require the dielectric loss tangent of the insulating material.
3, the breakdown voltage and electric strength
Failure occurs in the insulating material under a strong electric field into a conductive state and loses its insulating properties, known as breakdown. The breakdown voltage is called the breakdown voltage (dielectric strength). The electrical strength is the quotient of the externally applied voltage and withstand voltage breakdown occurs under specified conditions, the distance between the two electrodes, that is the unit thickness to withstand the breakdown voltage. For the insulating material, generally the breakdown voltage, the value of the electrical strength of the higher the better.
4, the tensile strength
Is the maximum tensile stress in the tensile test, the sample bear. It is the most widely insulating material mechanical testing, the most representative test.
5 Burning Resistance
Insulating materials to resist burning flame contact or leave the flame to prevent the ability to continue to burn. As the insulating materials applications growing, its resistance to flammability requirements are even more important, through various means, to improve and enhance the flammability resistance of the insulation material. Burning Resistance is the higher, the better its safety.
6, arc resistance
Under the specified test conditions, the insulating material withstand along its role in the ability of the surface of the arc. AC high voltage test using a small current by the role of high-pressure arc generated between the two electrodes, so that the surface of the insulating material forming a conductive layer the time required to determine the arc resistance of the insulating material. The time values​​, the greater the arc resistance better.
7, the degree of sealing
Sealed isolation of the oil, the water quality is better.