The resistive material is used as a heat source, and the outer layer is covered with a soft insulating material, and the metal shield layer is coated on the outer layer. There are two kinds of metal shielding materials, tinned copper wire or 316 stainless steel wire, which are used for manufacturing various household appliances. Heating element for heating.

Function and application
 
When the rated voltage is applied to the heating wire, the heating wire generates heat. Under the compatibility and influence of the external heat dissipation conditions, the temperature will be balanced within a certain range. It is used to manufacture electric heating elements of various shapes and is widely used in household appliances such as refrigerators, freezers, air conditioners, water dispensers, rice cookers and the like.
 
Variety
 
According to the insulating material, the heating wire can be a P5-resistant heating wire, a PVC heating wire, a silicone rubber heating wire, and the like. According to the power area, it can be divided into two types of heating lines: single power and multi power. 
 
The PS-resistant heating wire is a non-toxic heating wire. It is especially suitable for occasions where direct contact with food is required. Its heat resistance is low and can only be used in low-power applications. Generally, it does not exceed 8W/m, and the long-term working temperature is from 25℃ to 60℃. 

The covered material of the 105 °C heating wire meets the PVC/E grade in the GB5023 (1EC227) standard and has good heat resistance. It is a commonly used heating wire with an average power density of less than 12 W/m and a use temperature of -25 °C～70 ° C. Widely used in refrigerators, air conditioners, etc. as anti-dew heating lines.

Silicone rubber heating wire has excellent heat resistance and is widely used in refrigerators, refrigerators and other defrosters. The average power density is generally below 40 W/m. In a low-temperature environment with good heat dissipation, the power density can reach 50 W/m, and the use temperature is -60 °C - 155 °C.