Main indicators affecting the performance of insulating materials
The main indicators affecting the performance of silicone waterproof sealing ring are as follows:
1, insulation resistance and resistivity
Resistance is the reciprocal of electric conductance, and resistivity is the resistance per unit volume. The less conductive a material is, the greater its resistance, and the two are reciprocal. For insulating materials, it is always desirable to have the highest possible resistivity.
2, relative permittivity and dielectric loss Angle tangent
Insulation materials have two purposes: the mutual insulation of the components of the electrical network and the dielectric of the capacitor (energy storage). The former requires small relative dielectric constant, the latter requires large relative dielectric constant, and both require small dielectric loss Angle tangent, especially in high frequency and high pressure application of insulating materials, in order to make the dielectric loss is small, are required to use small dielectric loss Angle tangent of insulating materials.
3, breakdown voltage and electrical strength
In a strong electric field insulation material damage, loss of insulation performance into conductive state, known as breakdown. The voltage at breakdown is called breakdown voltage (dielectric strength). Electrical strength is the ratio of the breakdown voltage under specified conditions to the distance between the two electrodes subjected to the applied voltage, that is, the breakdown voltage per unit thickness. For insulating materials, the higher the breakdown voltage and electrical strength, the better.
4. Tensile strength
Is the maximum tensile stress borne by the specimen in the tensile test. It is the most widely used and representative test for mechanical properties of insulating materials.
5, combustion resistance
The ability of an insulating material to resist burning when it comes into contact with a flame or to prevent further burning when it leaves the flame. With the increasing application of insulation materials, the requirements of its combustion resistance are more important. People improve and improve the combustion resistance of insulation materials through various means. The higher the flammability, the better the safety.
6, arc resistance
The ability of an insulating material to withstand arc action along its surface under specified test conditions. The test uses ac high voltage small current, by high voltage between the two electrodes of the arc action, so that the insulating material surface to form a conductive layer required time to judge the arc resistance of insulating material. The higher the time value, the better the arc resistance.
7, sealing degree
The sealing isolation of oil and water quality is better.