Polymers, Elastomers and Two-Component Foams Seal, Reduce Noise Vibration and Harshness, Reduce Vehicle Weight, and Provide Easy Application
In all cases where sealants are needed, it is critical that the cavity be completely sealed. Significant acoustical and sealing effectiveness can be lost with even a small leak in the seal. A typical four-door car can have 10 different body-cavity areas that need sealants, where an SUV or minivan can have 16 to 20.
Generally, there are three options for sealing cavities: stuffer bags, baffles and foam. Stuffer bags are made up of a polyethylene bag that contains a soft foam block that is literally stuffed into the body cavity during the final assembly. These are a low-cost option for sealing the cavity but do not provide a 100% seal. Because the block must be stuffed into the cavity, it does not fill all the small crevices of the cavity, nor can it be placed in all cavities, since after the space frame is welded together, not all cavities are accessible.