1. Material aging: Over time, the material of the mat may age, causing changes in its physical and chemical properties, which will affect the material's conductive properties.

2. Contamination and wear: Contamination and wear on the surface of the mat will hinder the flow of charge and reduce its antistatic effect.

3. Environmental factors: Extreme temperature and humidity conditions will accelerate the aging process of the material, thereby affecting the antistatic performance.

4. Frequency of use: Mats that are frequently used and exposed to the working environment may lose their antistatic properties more quickly.

To ensure the effectiveness of the antistatic mat, it is recommended to perform performance testing regularly and maintain or replace it as needed. For example, the surface resistance test can be used to monitor whether the anti-static performance of the table mat is within the acceptable range. If the test results show that the performance has deteriorated, appropriate measures should be taken in time.