About TPU timing belt and CPU timing belt performance comparison

Mar.24.2025

TPU timing belt adopts thermoplastic polyurethane (TPU), through the extruder direct extrusion molding, process is relatively simple, the advantage is the production of flexible, applicable to the open belt or splicing into the ring belt, but the splicing may affect the tensile strength, high hardness (Shore 92 degrees or so), rigidity, tensile layer of steel wire or aramid wire rope

CPU timing belt adopts cast polyurethane (CPU), formed by liquid casting method in one time, forming a seamless ring belt, hardness is close to the rubber timing belt (Shore 65 degrees or so), better elasticity, the tensile layer is usually made of nylon cord or Kevlar core line, seamless design makes its tensile strength higher, suitable for high-precision power transmission scenarios.

Performance comparison between TPU timing belts and CPU timing belts
Performance indicators	TPU timing belts	CPU timing belts
abrasion resistance	8 times stronger than rubber for high friction scenarios	Lower abrasion resistance than TPU, but better than ordinary rubber
chemical resistance	Resistant to oil, acid and alkali, suitable for chemical environments	Better chemical resistance, but slightly inferior to TPU
Temperature adaptability	Operating temperature typically -20°C to 80°C	The temperature range is similar to that of TPU, but the performance is more stable under long-term high temperature.
tensile strength	High tensile strength (wire core reinforcement) for high load scenarios	Seamless construction for higher tensile strength, suitable for power transmission
dynamic buckling	Poor, easy to fatigue in reciprocal work	Better for frequent start/stop or vibration scenarios

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