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Pebax® Elastomers Offer Outstanding Energy Return for Optimal Power Transmission

Hysteresis is defined as the energy lost during a cyclic mechanical stress of a material and is a function of the modulus and the loss factor, tan ∂.

The tailored molecular microstructure of Pebax® resins contributes to lower hysteresis and tan ∂ when compared to other commonly used thermoplastic elastomers. The combination of this property (over a wide temperature range) as well as tremendous toughness, light weight and ease of processability make Pebax® resins powerful candidates for highly efficient power transmission belts, pulleys and silent gears.

Flexural modulus (MPa) vs. Temperature

This graph represents the modulus of rigidity (MPa) versus the temperature (°C) for different materials. There are three curves, each one represents a material: TPU, COPE and Pebax TPE.  We can see that Pebax TPE has a less modulus of rigidity than TPU or COPE. The curve is almost straight. At -40°C, the flexural modulus is 200 MPa for Pebax TPE. For the other materials: COPE and TPU, the flexural modulus is higher than for Pebax TPE: at -40°C, the flexural modulus is 400 MPa for the COPE and for the TPU the flexural modulus is approximately 580 MPa.

Energy Loss Factor (ELF)

This graph represents the energy loss factor (ELF) according to the elongation and the load for different materials: TPU and Pebax TPE compared to theoretical material with ELF=0.  We can see that the Energy Loss Factor for the Pebax TPE is weak. It is between 0.1-0.2 for PEBAX TPE. As for the TPU, the Energy Loss Factor is higher, between 0.4-0.5.

Pebax® Elastomers in Power Transmission Belts and Gears

Pebax® Elastomers Main Properties Applications Pebax® Solutions
Low hysteresis Low energy dissipated and heat build-up
High level of power transmitted
Belting/ Silent gears Pebax® 33 series: 25 to 55 ShD grades
Excellent flex fatigue and resistance Low relaxation Belting/ Silent gears Pebax® 33 series: 40 to 70 ShD grades
Creep resistance Pebax® 33 series: 25 to 55 ShD grades
Low vibration and noise
Low density
Belting/ Silent gears Pebax® 33 series
Ease of processing Easy and strong splicing Belting Pebax® 33 series
Very precise injection molding of small parts Silent gears
Chemical resistance Belting/ Silent gears Pebax® 33 series: 40 to 70 ShD grades
Dimensional stability Low shrinkage 
Low water, oil and grease absorption
Silent gears Pebax® 33 series: 40 to 70 ShD grades
Wear resistance
Low coefficient of friction
Silent gears Pebax® 33 series: 60 to 70 ShD grades

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