MagShield™ EPOXYBOND – The new frontier of magnet anchoring in BLDC motors

MagShield™ EPOXYBOND expands Politubes’ range of solutions for the fixing and protection of permanent magnets in surface-mounted brushless (SPM) motors.
This next-generation system combines heat-shrink polyester tubing with an internal coating of thermosetting epoxy resin (Class H – B-Stage), designed to deliver mechanical retention, electrical insulation, environmental protection, and process automation in a single product.

Two construction options available

1. Heat-shrink polyester tube with internal B-Stage epoxy coating.
2. Hybrid tube with heat-shrink polyester + glass fiber reinforcement + internal epoxy coating.

Both configurations ensure secure and uniform magnet fixation, eliminating the risk of micro-cracks and removing the need for costly metal retaining systems.

Integrated process: heat-shrinking + resin activation + bonding

During the manufacturing cycle, a single controlled thermal process allows to:

• Activate the B-Stage epoxy resin, achieving permanent adhesion between tube and rotor.
• Cure the magnet adhesive applied for magnet positioning.
• Shrink the tube, forming a high-strength and dimensionally stable wrap.

This integrated approach shortens process times, standardizes product quality, and improves production efficiency while reducing operational costs.

Technical advantages of MagShield™ EPOXYBOND

• Strong adhesion to the rotor surface thanks to the thermosetting resin layer.
• High mechanical strength and dimensional stability even at temperatures up to 175 °C.
• Effective sealing against moisture, dust, and environmental contaminants.
• No magnetic interference: the magnet’s operational flux remains unaffected.
• Easy integration in automated assembly lines, with shorter cycle times than taping or two-component adhesives.
• Reduced wall thickness, ideal for compact, high-performance motors.
• Simplified removal for maintenance and magnet recovery.

MagShield™ EPOXYBOND is the ideal solution for BLDC motor manufacturers aiming for maximum reliability, automation and performance, while reducing assembly complexity and cost.