How to choose between car sound insulation cotton and sound-absorbing cotton

　　Both sound-absorbing cotton and sound-insulating cotton are excellent sound insulation materials. So, what are the differences between sound-absorbing cotton and sound-insulating cotton?

　　The difference between sound-absorbing cotton and sound-insulating cotton

　　Sound-absorbing cotton has a sound-absorbing effect, that is, it converts sound energy into heat energy. Sound insulation materials, on the other hand, block the transmission of sound, but they are prone to sound energy reflection.

　　Good sound-absorbing and sound-insulating materials. For example, if our main purpose is sound insulation, then simply put, we want to "eliminate" the noise. For example, "gradient sound-absorbing cotton", it is a laminated stepped density porous material, the pores inside are interconnected, and after the sound enters, it rubs against the pore walls of the material, energy conversion, and finally achieves the purpose of attenuating sound energy.

　　Directly pasting sound insulation cotton on the glass wall should have a certain effect if the right material is selected. There are two situations where there is no effect: one is that the material itself is ineffective, which is related to the material and structure; if you use gradient sound-absorbing cotton, you will find that it can produce an effect;

　　Another situation is that the regular installation method of sound insulation cotton should be filled in the keel, and then sealed with a board. That is to say, this installation method can maximize the effect. If good materials such as gradient sound-absorbing cotton are used in the direct pasting method, it can be effective, but the sound insulation effect is still different from the keel installation method. Of course, high-impedance sound insulation felt can also be selected, and this material also has a significant sound insulation effect.