New Hytrel grade for CVJ inboard boots

Introduced in 1984 for automotive constant velocity joint (CVJ) outboard boots, Hytrel TPC-ET is a standard material for the production of these parts. Now DuPont has developed Hytrel HTR8745 BK320, a new grade for blow moulding of CVJ inboard boots.

The new grade is said to provide multiple benefits that include:

  • Improved processing (press blow molding, injection blow molding) with low die swell and better parison stability
  • Good thermal resistance up to 140 °C
  • Flex-fatigue resistance for long boot life
  • Abrasion resistance for high-angle installation with compact boot designs
  • Tear resistance for protection from road debris
  • Stiffness to resist ballooning
  • Low grease permeation for extended joint life

The Hytrel brand belongs to DuPont Transportation & Advanced Polymers, a newly formed business segment within DowDuPont’s Specialty Products Division.