This specification details the requirements of waterborne, sprayable sound damper (Liquid Applied Sound Damper (LASD)). The purpose of this material is to reduce vehicle metal noise vibrations excited by engine, tires, transmission and stone impingement. The material is applied in the Paint Shop after electrocoat and must be capable of robotic application. 

Material Description. 

The material must be a smooth and homogeneous mixture that contains no lumps, air, unmixed particles or foreign materials.

The material must be capable of being dispensed with approved production pumping and application equipment. 

The material must not exhibit a noxious odor or adversely affect personnel handling it at any time.

The material must not contain corrosion-causing ingredients.

This bakeable material must adhere to all GM globally approved production electrocoats. 

The material must be compatible with electrocoat, sealer, primer surfacer, topcoat and interior component systems. 

Symbols. Not applicable. 

Typical Applications.

The material reduces resonant vehicle vibration of metal panels by adding damping to selected areas. The material can be applied to typical acoustical hot spots, such as the floor pan, toe pan or rear cargo/trunk floors. Where material rheology and vehicle build conditions allow, the material may also be used on the plenum, door panels and roof panels.