Sound Deadening Thickness, Weight, Adhesion and Cost

Thickness, Weight, Adhesion and Cost

While the dampening material itself (asphalt or butyl rubber) has the biggest impact on performance, the material thickness, weight, adhesion and cost should also be addressed during product selection. All other factors being equal, a thicker automotive sound deadening material will be more effective than a thinner automotive sound deadening material. However, there is a point of diminishing returns with respect to material thickness. A material that is twice as thick isn’t going to have double the acoustic loss factor. Material thicknesses generally vary between 1mm and 2.2mm, with some offerings as thick as 4mm. In going thicker, the weight also increases. Thin 1mm products might come in around 0.25 pound per square foot while a thick 2.2mm products be close to a pound per square foot. On the extreme side, a 4mm product might be close to 1.0 pound per square foot. When the B-Quiet team did their Subaru WRX we used  60 square feet of material on our WRX to get 70-80 percent coverage of sound deadening material . Our weight addition was only 19 pounds which will result in a minimal impact on fuel economy and acceleration performance. In addition to material and thickness, the quality of the adhesive used in the product will influence the products short-term and long-term performance. For a sound deadener to work at maximum efficiency, it needs to have a strong bond to the metal it covers. Wherever the material fails to make a strong bond is where it also fails to make an impact on sound dampening. In the long run, the adhesive must stay strong over time. When removing OEM sound deadener material from a vehicle, it’s very common to find rust forming as adhesion of OEM sound deadeners is often not done correctly from the factory. Ultimately, cost is a factor for any product considerations.  The questions that needs to be asked is, what is my budget and does this fit with what my vehicle will be used for.  While ashfualt deadeners tend to be a more affordable product, they are also thinner, Butyl rubber, is a thicker deadener and tends to perform better.  Either way, you cant go wrong with a  budget friendly deadening option from

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