Content .. 2686 2687 2688 2689 ..
Chevrolet Silverado / GMC Sierra. Manual - part 2688
Look for the SAE code stamped into the part.
Code Found
Match the code to those in the plastic identification chart to determine whether the plastic is thermoplastic or
thermoset plastic, and whether the plastic is rigid or flexible. Refer to Plastic Identification and Refinishing
Systems.
No Code Found
Perform one or both of the following tests to determine if the part is thermoplastic polyolefin or thermoset non-
polyolefin.
Float Test
1. Cut a shaving of plastic from the back of the part.
The shaving should be free of mold release agents and paint.
2. Place the shaving in a container of water.
Thermoplastic polyolefin floats.
Thermoset non-polyolefin sinks.
Abrasion Test
Sand a spot near the damaged area with Grade 36 Roloc Disc.
Thermoplastic polyolefin material melts or frays when sanded.
Thermoset non-polyolefin material sands cleanly.
Thermoplastic and thermoset plastics can be either rigid or flexible. Thermoplastic plastic parts are best repaired
with a hot iron plastic material-feed welder, but are usually replaced. Thermoset plastic can be repaired with
epoxy or other more rigid 2 package repair material.
For rigid thermoset repair materials, refer to Rigid Plastic Part Repair Materials.
For flexible thermoset repair materials, refer to Flexible Plastic Part Repair Materials.
For general repair instructions, refer to General Plastic Repair.
PLASTIC IDENTIFICATION AND REFINISHING SYSTEMS
CAUTION: Do NOT use a plastic burn test to distinguish the type of plastic. The burn
test produces vapors which are harmful.
Identifying
Symbol - Old
Chemical
Composition or
Plastic Family
Typical Area(s)
Where Part is
Examples of
Common/Trade
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Plastic Panel Information and Repair - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Microsoft
Friday, August 21, 2009 2:22:25 PM
Page 5
© 2005 Mitchell Repair Information Company, LLC.