First of all, let me tell you what is sound? Simply speaking, the sound is a kind of wave, which is generated by the vibration of the object. A sound wave is a wave phenomenon that propagates through the medium and can be perceived by the auditory organs of people or animals. This is something that you probably learned in your high school physics class.
Then where is there no sound? Yes, there's no sound in a vacuum. We just need to vacuum our house to insulate the sound. It is just kidding. We're done in a vacuum.
There are many units of sound:
One is Hertz, and Hertz is the frequency of sound. Our human ears can hear sounds between 20 and 20,000 Hertz, and we're most sensitive to sounds between 200 and 800 Hertz. Many animals’ ears are just beyond that. For example, bats can produce and hear sounds higher than 20,000 Hertz, which is not sound anymore, it's ultrasound.
Second, the unit of sound is the dB, which is the decibel. It is the unit of sound intensity, which is the size of the sound. The intensity of the sound can be divided into these categories: between 0 and 40 decibels is quiet and almost imperceptible. 40-60 decibels is a normal sound in a living environment. 60-70 decibels is more noisy, equivalent to walking in the downtown feel. 70-120 decibels is noise and we can't stand it. Anything above 120 would be beyond our reach. That's the decibel value in the tests that we did earlier.
I said so much, then how can our products be soundproof? As we mentioned above, the sound is generated by vibration and propagated by the medium. Our products belong to medium. In theory, the general object has a sound insulation effect, just not so obvious. Our products are mostly rubber products, and rubber is a high elastic polymer material, coupled with the special network structure of our products, with a large number of micropores. When the sound wave enters the product, it causes the air vibration in the micro-hole. Due to the frictional resistance, air resistance, and heat conduction, a considerable part of the sound energy is converted into heat energy, thus playing the role of shock absorption. When the vibration reduces, our sound transmission will be weakened. In this way, our products have played a considerable role in the consumption and absorption of sound transmission. Did you get it?