Several common acoustic materials
Acoustic materials (mainly sound-absorbing materials), involving all aspects of life, in the United States, only 1% of acoustic materials used in the field of music recording, more for residential, hotel, restaurant, office buildings, stadiums and other construction. Domestic acoustic materials are commonly found in the following categories:
The first one is a sponge soft bag: this material has a very high risk factor. This material is used in KTV and hotel ceilings. This is a flammable product that can only eliminate echo and cannot be used as soundproofing material. "This thing is the soft bag we often say. Filling the sponge, so the fire can not be flame retardant, but the combustion."
The second type is a polyester fiber sound absorbing panel: this material can be made into various colors, very beautiful and easy to install, but its advantages are limited to this, and it has no effect on sound.
The third type is wooden sound-absorbing panels: many companies have visited abroad and saw that the wooden sound-absorbing materials of people's households are very beautiful, so they come back to study, and they also cover the wood when they are decorated. In fact, the sound-absorbing material of this surface wood, the real sound effect is the sound-absorbing cavity behind it. Domestic companies follow the example of the surface of the wood, there is no cavity behind, of course, there is no sound absorption. With the passage of time and changes in the surrounding environment, the wooden sound absorbing panels are easily deformed and the water repellency is also poor.
The fourth type is glass wool: glass wool refers to a chain silicate which exists in the form of fibers in nature. Fibers that are invisible to the naked eye float in the air. Long-term inhalation can cause hydatidosis. The body can not absorb it and can not be excreted. It is harmful to the respiratory system and even induces lung cancer and lung abscess. In addition, it also hurts the skin and eyes. People who are exposed to glass wool are also susceptible to contact dermatitis, conjunctivitis, keratitis, and the like. Many developed countries have imposed strict restrictions on the use of glass wool.
The fifth type is foamed aluminum: foamed aluminum, also known as foamed aluminum, foamed aluminum has excellent physical properties, chemical properties and mechanical properties as well as recyclability. It is a material that is light, non-combustible and does not generate harmful gases. , absorb reverberation and more. The foamed aluminum has stable performance. As time goes by, the sound absorption effect will not decrease. Putai's foamed aluminum is treated with oxidation resistance and has a longer service life. It is made of high-purity aluminum as a raw material and can be permanently recycled.
What kind of acoustic material is called?
Good acoustic materials should be able to withstand the detection of three indicators.
First, the noise floor (background noise);
Second, the frequency response curve;
Third, the reverberation time.