TPE Constant Velocity Joint Boot Makes SPE Hall of Fame Bid

DN Staff

October 5, 2009

1 Min Read
TPE Constant Velocity Joint Boot Makes SPE Hall of Fame Bid

Every year, the Society of Plastics Engineers picks a particular application to honor in its Hall of Fame. It’s always fun to see what they picked. One of the nominees this year is the use of thermoplastic elastomer in constant-velocity joint (CVJ) boot applications, which was first used 25 years ago by General Motors’ Saginaw Steering Division.

When auto OEMs started designing front-wheel drive vehicles in the 1970s to improve fuel economy, engineers shifted from rubber to TPE for boots to boost  flex fatigue and contaminant resistance.  “Thermoplastic elastomers were a huge step change - all of the sudden the durability was more than doubled so consumers no longer had to deal with boot failure, engineers could now design smaller, more compact, less costly boots, and automakers could worry less about service-life limitations,” says Eric Randa, DuPont Automotive chassis segment manager.

The nomination for Hytrel elastomer states that more than 1 billion boots have been in service without material failure - each surviving 150,000 miles of continuous flexing, pelting and thermal cycling.

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