What is the sponge inside the tire?

[VanElle]

The sponge inside the tire is called "internal soundproofing foam." Its functions are as follows: 1. Noise isolation: It blocks external sounds to achieve the effect, such as noise from passing vehicles nearby. It minimizes sound reflection and reduces noise transmission to the ears by converting sound energy into heat through friction with the air in the material when sound waves enter. Its primary role is to absorb and reduce noise generated by internal vibrations. 2. Temperature isolation: It can block temperature transfer. The sponge helps maintain the cool air inside the tire from being affected by the heat from the engine compartment, thereby preserving the air conditioning effect.