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Technical Information Noise pollution is becoming an increasingly serious problem due to more traffic congestion, new kinds of recreational vehicles and boats, more mechanization and industrialization, as well as larger, faster, and more powerful vehicles. It is well known that noise is emitted from a resonating structure, such as the noise resulting from striking a cymbal. The amount of noise can be drastically reduced by applying a layer of vibration damping compound to the surface of the resonating structure. The vibration damping compound causes the vibrational energy to be converted to heat energy. If this is accomplished, the need to absorb and attenuate airborne noise with sound absorption and barrier materials is greatly reduced. Materials which combat noise pollution are called damping agents. Extensional damping is a commonly used form of damping that includes the adhesion of the damping agent directly to the substrate. The vibration of metal panels, housings, and enclosures is a common source of high-intensity noise optimally treated with extensional damping. Reduction of resonant vibrational energy and consequently the noise can efficiently and economically be achieved by the use of StealhKote to convert vibrational energy to heat energy resulting in the following benefits:
Effect of noise on Humans The human ear hears sounds between 10 and 200 dB. Sound is not a linear measurement, it is a logarithmic. When we hear a difference in sound, we may perceive it to be twice as loud, when in reality it is not. It is thousands of times louder. For example, internal car noise averages 80 dB, where as a jet engine at full power produces 160dB of sound pressure level. Obviously, a jet is more than twice as loud as the inside of your car. A 3dB reduction in sound level pressure requires that 50% of the sound energy be removed or eliminated. A 10dB reduction, which only halves the apparent loudness, requires that 90% of the sound energy be removed. Therefore, to achieve large amounts of noise reduction, it is necessary to remove enormous portions of the total noise. Repeated exposure to high noise levels for long periods of time will result in reduction of productivity, hearing loss, mental illness, and even death. North American industrial standards have established 85dB as the maximum sound level for 8 hours of continuous exposure in a working environment. Higher sound pressure levels require shorter work days with full compensation. The American Walsh-Healy regulation provides the following exposure limits:
Containing sound is a major problem for which there are not many obvious remedies. Sound initiated in one room will excite the walls around it, this in turn will excited the air beside it on the other side of the wall, in fact transferring the noise to the adjoining room. The prevention of this is not accomplished by absorbing air born noise in the room where the noise is initiated, but by stopping the vibration of the wall around it. This is referred to as Transmission loss or "TL". StealthKote is able to perform exceptionally well in sound transmission loss with out adding huge amounts of weight or mass as has been the standard approach for decades. Instead of adding extra sheets of drywall, or 1lb. per sq. foot lead or barium barriers, StealthKote can be applied at the rate of .4 lbs per square foot and perform comperably.
The effect of leaks through or around barriers: Any holes or openings either through the barrier or at its perimeter will provide a path for sound to escape. If air can get through, sound will. Even a tiny hole can seriously reduce the performance of a barrier. A 1 sq in. opening can transmit as much sound energy as a 100 sq ft wall. With a liquid damping system, there is no opening, or cracks, you can create an effective sealed noise prevention system. Safety Data Flammability & Smoke Tests
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