Essential Performance Characteristics of Non-metallic Parts Insulation Materials in Electrical Appliances

The improvement of people’s living standards has made various electrical appliances more and more widely used. In order to avoid short circuit, electric leakage and electric shock when the current in the electrical appliance is in contact wit……

The improvement of people’s living standards has made various electrical appliances more and more widely used. In order to avoid short circuit, electric leakage and electric shock when the current in the electrical appliance is in contact with the human body during use, some current carrying conductors in the electrical appliance are required to insulation. Then we need insulation materials.

With a variety of insulation materials, the conductive parts can be isolated from the outside to ensure that the internal current of the appliance does not leak. Of course, the insulating materials in the electrical appliances are also required to meet some performance requirements, such as dielectric properties, mechanical strength, heat resistance, and moisture absorption properties.

The dielectric properties are the evaluation of the insulation quality and the stability of the internal molecular structure of the insulating material under the application of external voltage. The insulation resistance, the withstand voltage, the leakage current, and the arc resistance are all concrete manifestations of dielectric properties. The insulation resistance is the most basic indicator to measure the quality of the insulation. Generally, the insulation material has a large insulation resistance, so its conductivity is very weak and the current can hardly pass.

In household electrical appliances, non-metallic parts composed of insulating materials and their structures have a certain mechanical strength and can withstand one or several forms of mechanical load, including stretching, bending, heavy pressure, vibration, and tightness,  squeeze, mechanical shock, etc.

Since the electric appliance will generate heat during the energization process, the temperature will rise, so that various non-metallic parts will have different degrees of change, so the insulating material is required to have a certain resistance to thermal change. In addition, the insulating material used for non-metallic parts has many capillary pores and more or less cracks, which are easily penetrated by water molecules.

Since the moisture infiltrated in the insulating material causes the dielectric properties to be lowered, these insulating materials must have strong moisture resistance to avoid moisture inhalation, thereby ensuring the stability of the dielectric properties of the material and protecting the electrical appliance.

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