For over 40 years, Politubes has been supporting electric motor manufacturers with a dedicated solution based on thin heat-shrinkable polyester tubing, engineered to reduce rotor noise, improve dynamic balancing, and provide Class II reinforced electrical insulation.

The solution is suitable for universal motors and brushless motors (BLDC and SPM) and is designed to meet the highest requirements in terms of performance, reliability, and certification in the most demanding industrial applications.

Noise and Vibration Reduction Through Rotor Surface Uniformity

Once heat-shrunk onto the rotor, the tubing perfectly conforms to its geometry, providing:

• Complete surface uniformity, achieved by fully covering the rotor slots
• Noise reduction of several decibels, by minimizing air turbulence generated by the slots
• Improved rotor roundness and dynamic balance, key factors for motor performance, efficiency, and service life
• Full protection of the rotor against dust, moisture, and contaminants, preserving structural and functional integrity over time

The result is quieter, smoother, and more reliable operation throughout the entire motor lifecycle.

Certified Electrical Insulation with Minimal Thickness

• Manufactured from low- or medium-shrink polyester heat-shrink tubing
• Wall thicknesses from 0.050 to 0.160 mm, with no interference to the magnetic flux
• High mechanical strength and dielectric insulation up to 4–5 kV
• Thermal class B – F

Regulatory Compliance and International Certifications

The tubing fully complies with IEC 60335-1 requirements for Class II reinforced insulation, enabling simplified certification processes with VDE, UL, and CCC, without the need for costly additional grounding components.

Automation and Production Efficiency

• Fully compatible with automated production lines
• Fast application through immediate heat-shrink processing
• Supplied pre-cut or in continuous reels, reducing setup time, logistics costs, and material waste

Quality, Reliability and Sustainability

Complete rotor coverage enhances resistance to mechanical shocks, corrosion, and thermal cycling, contributing to extended motor service life.

All adhesives used are REACH and RoHS compliant, ensuring safety, long-term stability, and environmental responsibility without compromising the material’s technical performance.