Acoustic insulation with foaming material (Freelander 2)

Expanding foam sound deadening seals are used in various hidden cavities of the car body to improve the performance of the car. This seal is applied during the production of the car and expands during the painting of the body, increasing the volume by about 10 times. Sound deadening seals are placed so that they impede the propagation of sound through a given element of the structure and reflect sound traveling through the air.

Depending on their location, these seals can have a dual purpose. Seals located at the base of the body pillars are primarily designed to isolate the body from water when fording. An additional 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 penetration of both fuel and water. The auxiliary purpose of this seal is sound insulation and protection against dust penetration.

The main purpose of the remaining seals is to prevent the transmission of sound into the passenger compartment through structural elements and through the air.

Another advantage of using foaming materials inside cavities is a significant increase in the rigidity and strength of body elements, improving safety in the event of a collision.

These seals are made using foaming polymer.

Replacing foam soundproofing seals

Since the heating temperature of parts during painting during repair operations is significantly lower than during factory painting of a car (the temperature is insufficient for the foam to expand), then during repairs a different technology is required to restore the foam.

The foam sound insulation seal must be restored if it is damaged during repairs. If access permits (whether installing a new seal or reusing an old one), spray the sound insulation foam after applying the paint coat. If access is not possible, or if the nature of the repair makes it impractical to apply foam, use a suitable flexible polyurethane sealant. Apply this around the seal and the relevant panel(s) before assembly. In all cases, the foam/sealant should form a seal between the foam sound insulation seal and the adjoining panel.