PU molded timing belts

Keiper PU molded timing belts (form belts), which are cast in special molds, are made of abrasion-resistant polyurethane and high-strength steel cords (or aramid cords). The cast PU timing belt is an exact replica of its mold. Consequently, high pitch accuracy along the entire length of the belt is realized. They are particularly well suited for smooth running and high speeds. By combining high-quality materials and this modern production method, the resulting timing belts exhibit supreme mechanical, chemical and physical properties.

Mechanical properties:

  • Low longitudinal tolerance
  • Longitudinal stability, negligible elongation
  • Form-fit, synchronous running
  • Low noise
  • High abrasion resistance
  • Maintenance-free
  • High flexibility
  • Positional accuracy, isogonic
  • Crossed application possible
  • Steel cords with flexural fatigue strength and limited extensibility
  • Small space requirements
  • Favorable performance-weight ratio
  • Low bearing load with optimal tension
  • Large transmission ratios possible
  • High efficiency up to 98%

Chemical properties:

  • Good ageing resistance
  • Operating temperature range from -30°C to +80°C
  • Resistant to simple oils, greases and gasoline
  • Limited resistance to many acids and alkaline solutions


  • All types of drives
  • Office machines
  • Textile machines
  • Wood-processing machines
  • Machine tools
  • Printing machines
  • Pumps
  • Compressors
  • Construction machines


KEIPER_PU molded timing belts endless.pdf