Insulation sheets undergo polarization, electrical conduction, dielectric heating, and breakdown under the influence of an electric field. While enduring the electric field's effects, they also have to withstand mechanical and chemical influences, among others. Over time, aging phenomena may occur during prolonged operation. Therefore, many failures of electrical products often occur in the insulation section.

Dielectric aging refers to the gradual deterioration of the electrical and mechanical properties of dielectrics over time during long-term operation. Its main aging forms include electrical aging, thermal aging, and environmental aging, among others.

Electrical aging. Commonly found in high-voltage electrical equipment, the primary cause is the local discharge of insulating sheets under high-voltage conditions.

2. Thermal aging, commonly found in low-voltage electrical appliances, involves the oxidation, cracking, and deterioration of the internal components of insulating sheets under the influence of temperature. This leads to hydrolysis reactions with water, gradually causing the loss of insulating properties.

3. Environmental Aging, also known as atmospheric aging, refers to a chemical aging caused by pollution, triggered by factors such as ultraviolet rays, ozone, salt fog, and acidity/alkalinity. Among them, ultraviolet rays are the primary factor, while ozone is generated by the corona discharge or local discharge from electrical equipment.

Insulation sheets typically lose their insulating properties irreversibly upon aging. Engineering commonly employs the following methods to prevent the aging of insulation sheets.

During the insulation sheet manufacturing process, anti-aging agents are added.

2. Outdoor insulation sheets can be enhanced with UV absorbents or use interlayers to block sunlight.

Insulating sheets for humid regions can be treated with a mold inhibitor.

Enhance local antistatic corona and partial discharge protection measures for electrical equipment.