What is the lifespan of a seat belt?

[Costa]

The lifespan is generally around 5 years. Car seat belts are devices installed in vehicles to ensure the safety of passengers and drivers by reducing injuries during severe collisions. Modern cars travel at high speeds, and in the event of a collision, passengers' bodies continue to move forward due to inertia, potentially hitting the interior of the car or even shattering the windshield and being thrown out of the window. Additional details are as follows: 1. Lifespan of the internal retractor spring: This mainly refers to the lifespan of the seat belt's internal retractor spring. After 3 years, the seat belt may suddenly fail and become ineffective. 2. Optimal performance period of the seat belt retractor: The first 3 years are when the seat belt retractor performs at its best. After that, it begins to age more rapidly. 3. Checking if the seat belt has become looser: Another sign is that when you pull the seat belt sharply, it may not lock promptly, resulting in excessive slack and failing to restrain the body during emergency braking. At this point, the seat belt has effectively reached the end of its lifespan.