For 1990-2009 cars

# Info - Expandable Acoustic Foam (Two Component Sound Dampener) Usage with Collision Damage Repairs

Subject: | Expandable Acoustic Foam (Two Component Sound Dampener) Usage with Collision Damage Repairs

Models: | 2003 and Prior Passenger Cars and Light Duty Trucks

| 2003 HUMMER H2

When performing collision repairs or replacing some components on most GM model vehicles, it is important that the foam blocking material used for noise, water and dust control be replaced as well.

This foam material is packaged as a two component material. This material is applicable for replacement of the original production material, since both are a "closed cell material" and are not water absorbent.

TYPICAL LOCATIONS for this material are indicated on the illustrations below. SPECIFIC FOAM LOCATION WILL BE PROVIDED IN GM SERVICE MANUALS IN THE NEAR FUTURE.

### Two Component Material

This material has more of an industrial application, but can be obtained (from the sources listed below) in various quantities useful for collision repairs.

It is especially useful when filling "blind" areas (areas that can't be seen) that require the expansion of the material to ensure sealing.

Our experiments indicate the following information:

Important: Do not use more than was needed for production applications.

• | Over application of this material in some areas of the vehicle may change performance characteristics and is not recommended.

• | It is recommended that a small amount be applied into a disposable container to become familiar with the rate of discharge and ensure proper mixing of both material parts.

Contact the following sources for information on sales and distribution.

• | For larger jobs (rocker box):

- | *"FROTH PAK" 12 KIT, Insta-Foam Products, Inc., Disturbed by Essex Arg.

- | Contact 1-800-246-4405, ext.11, (in Canada, contact Dow Chemicals at 1-800-366-4740).

• | For smaller jobs (A pillar):

- | *3M® Corporation, Flexible Foam 0.201L (6.8 oz), P/N 8463.

- | In U.S., call 1-800-521-8100, ext 5165 (in Canada, 1-800-364-3577).

- | *Kent Automotive, Urefoam Expandable 0.050L (1.7 oz), P/N 10630, or 0.296L (10 oz), P/N 10601.

- | In U.S., call 1-800-654-6333 (in Canada, 1-800-563-1717).

*We believe these sources and their products to be reliable. There may be additional manufacturers of such products. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or equipment from these firms or for any such items which may be available from other sources.

Important: As always, follow the manufacturer's recommendations for application and safety.

#### Typical Foam Installation Areas (Cars)

#### Typical Foam Installation Areas (Trucks)