Polypropylene Foam Energy Absorbers - Repair
File In Section: 10 - BodyBulletin No.: 63-20-02
Date: September, 1996
INFORMATION
Subject:
Repair of Polypropylene Foam Energy Absorbers
Models:
1997 and Prior Passenger Cars Using Polypropylene Foam Energy Absorbers
Some General Motors vehicles use a formed piece of Polypropylene foam as energy absorbers behind fascias. These energy absorbers (EA) are designed to offer a measure of safety in the event of a collision and have been engineered to withstand slight impacts (5 mph or less) with little or no damage. However, in some instances, the EA may crack or even break.
The following information has been developed to offer an alternative to low impact EA replacements. The foam EA can be identified in most cases by the symbol "PP" molded into the surface. Following the procedure will allow the technician to repair an EA and return the vehicle to the original crashworthiness state.
Polypropylene Foam EA Repair Procedure
1. If cracked or broken, make sure all the pieces of the EA are available for the repair.
Important:
If pieces of the EA are missing, the EA must be replaced.
2. Clean the areas to be bonded by brushing off any loose dirt or using soap and water, if necessary.
Notice:
DO NOT USE SOLVENTS TO CLEAN POLYPROPYLENE EA. The use of solvents may result in damage to the EA.
3. Using a 3M POLYGUN TC HOT MELT APPLICATOR GUN* and 3M JETMELT ADHESIVE # 3764*, apply adhesive to the parts by following the instructions for the applicator gun. Ensure complete wet out of the adhesive on the repair surfaces during reassembly of the EA.
Important:
The adhesive has a 40 second "work time" and requires a 2 minute "clamp time". Allow 20 minutes for the adhesive to fully cure.
The "3M Polygun TC Hotmelt Applicator Gun" and "3M Jetmelt Adhesive # 3764" can be obtained by calling DIRECTECH at 1-800-877-9344 or 612-941-2616.
* We believe this source 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 from this firm or for any such items which may be available from other sources.