Sound Dampening

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Automotive Sound Deadening Material
Automotive Sound Deadening Material

Sound Deadening, also known as sound dampening, is a generic term for an assortment of products used to control noise,subwoofer bass tones and/or structural vibration. Noise can be caused by the engine or exhaust, road noise from other vehicles. Sound deadening and sound dampening materials are commonly located in the vehicle's door cavities, and the boot/trunk area of the vehicle. Some of the most common sound deadening materials are; dampers, absorbers, barriers, and composites.


The sheet metal on a vehicle vibrates, essentially turning it into an unwanted speaker, the use of sound dampening helps absorb the structural vibrations. It uses mass loaded vinyl to lower panel resonance buy converting it into low level heat. This material is designed to work with minimal panel coverage, saving time and money.


These products literally absorb airborne sound waves. The sound waves travel through the closed cell foam which slows its progress reducing the overall level in the process. Closed cell foam is a durable and moisture resistant sponge-like material that is commonly used on floors and firewalls. Many companies have begun to market aerosol cans of spray foam to create an absorber. These sprays are often used in places where matting would either be too difficult, or would add too much weight/bulk. Door cavities are the most common application for sprays.


These products form a barrier or wall, blocking the sound waves from passing through. Creating a sound dampening effect. The more dense the barrier, the more effective it is. Lead which commonly used makes an excellent barrier or the mass loaded vinyl offers an inexpensive alternative.


The best results are achieved by using more than one sound deadening material. A composite is simply just using one of the materials above with another one, for example to create a better sound barrier use closed cell foam and mass loaded vinyl together. Most sound deadening materials have an adhesive quality and can be applied by simply pressing it into place with the use of a roller and a heat gun. Spray applications are less common because of the additional installation difficulties.

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