Mass loaded vinyl vs rubber1/16/2023 ![]() ![]() Acoustic foams were first used in the mid 1970's. let us now take a look at some unique, soundproofing materials. The above properties qualify a material as good for soundproofing. The more bends the sound waves have to maneuver, the more momentum they loose. This is a measure of the twists and turns in the material's cell arrangement. Open cell arrangement make better absorbers, while closed cell arrangements make better blockers. The cell size of the material must be smaller than the wave length of the sound it is meant to absorb or block. ![]() The individual cells of the material, have to be adequately small for the material to qualify for soundproofing. Resistivity is dependent on tapers of the sound waves. It is the most important characteristic of sound absorbers. This is the flow resistance to noise per unit thickness of a material. Porosity is an advantage in absorption and a disadvantage in blocking. This property involves the use of intersiticies to alter the energy of the sound waves by expansion, compression and change in the direction of flow resulting in loss of momentum. If the density is too high, the waves get reflected off the material's surface. If the material's density is too low, the sound waves are transmitted through. High enough and sound waves get damped low enough and they get absorbed. For a material to be sound proof it has to fall within a proper density range. It is measure of how packed together, the molecules of a material are. Density is the amount of mass per volume of a substance. Before studying some of these materials, we need to first get an understanding of what properties make these materials unique. There are a few materials that can effectively carry out soundproofing. ![]() One might imagine that soundproofing can be achieved by any material, this is however, far from the case.
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