Depending on the location, these seals can have a dual purpose. Seals located at the base of the body pillars are mainly designed to isolate the body from water when fording. Auxiliary purpose of these seals is sound insulation, and protection against dust penetration.
The main purpose of the seal around the fuel filler neck is to protect against the ingress of both fuel and water. The auxiliary purpose of this seal is sound insulation, and protection against dust ingress.
The main purpose of the remaining seals is to prevent sound transmission to the passenger compartment through structural elements and through the air.
Another advantage of using foam materials inside the cavities is a significant increase in the rigidity and strength of the body elements, which improve safety in the event of a collision.
These seals are made using an expandable polymer.
Replacing foamed soundproofing seals
Since the heating temperature of parts during painting during repair operations is much lower than during factory painting of a car (the temperature is insufficient for the expansion of the foam), then the repair requires a different technology to restore the foam.
The foamed soundproofing seal must be restored if it is broken during the repair. If access allows (when installing a new seal or when reusing an old one), spray soundproofing foam after painting. If access is not possible, or if the application of foam is not practical due to the nature of the repair, use a suitable flexible polyurethane sealant. Apply it around the seal and corresponding panel (to her) before assembly. In all cases, the application of the foam/sealant must form a seal between the foamed soundproofing seal and the adjoining panel.
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