KEMIBOND® EP120: High-Performance Structural Adhesive for Motor Magnets and Battery Packs

Section 1: Technical Overview

KEMIBOND EP120 is a two-component, high-performance epoxy structural adhesive engineered for demanding industrial assembly. Specifically formulated for applications requiring extreme bond strength and superior toughness, it offers stable curing at room temperature or accelerated processing via heat.

• Exceptional Bond Strength: Delivers high shear and tensile strength, ensuring structural integrity even under high-speed rotation and centrifugal forces.
• Engineered Toughness: High impact resistance and flexibility designed to absorb vibrations and thermal shock in motor and battery environments.
• Environmental Reliability: Outstanding resistance to aging and chemical media, maintaining performance in harsh operating conditions.
• Optimized Work Life: A 60-minute pot life provides an ample window for precise alignment of complex components.

Section 2: Technical Data Matrix

The following data are typical values based on standard laboratory environments (23±2  °C, 50±5%RH ).

Engineering Selection Insight: With a Dielectric Strength of , EP120 is an ideal choice for Battery Pack (EV/ESS) internals, providing essential electrical insulation. Its 26 MPa shear strength on steel makes it a top-tier solution for securing magnets in high-torque electric motors.

Section 3: Applications & Substrate Compatibility

EP120 is widely utilized in industrial sectors where structural reliability is non-negotiable:

• Electric Motors: Specifically designed for bonding Permanent Magnets (Magnet Steel) to rotors, capable of withstanding magnetic flux impact and high-RPM stress.
• Battery Pack Assembly: Ideal for structural fixing, component bonding, and housing reinforcement within EV and ESS battery modules.
• Versatile Substrates: Excellent adhesion to Metals (Steel, Aluminum), Ceramics, and most Engineering Plastics.

Section 4: Process Engineering Insight

Assembtek’s technical team offers the following strategies for optimizing mass production:

• Mass Production Efficiency: For automated lines, we recommend 2L pails used with automatic meter-mix dispensing systems to ensure consistency and reduce material cost per unit.
• Performance Optimization: While EP120 cures at room temperature, heat-accelerated curing significantly enhances heat resistance and final mechanical properties.
• Cost-Reduction Insight: The high toughness of EP120 reduces stress concentration in vibrating environments, lowering long-term maintenance costs and warranty claims.
• Low-Temperature Handling: Viscosity increases in colder climates. We recommend verifying dispensing parameters or pre-heating the supply system slightly during winter to maintain stable flow rates.

Section 5: Compliance & Quality Assurance

• Structural Stability: Maintains stable physical and electrical properties across a wide temperature range ( −50°C to 150°C).
• Electrical Reliability: Features a high Volume Resistivity of , meeting stringent insulation requirements for power electronics.
• Shelf Life: 12 months when stored in a cool, dry  28℃ place below .

Section 6: Expert FAQ

• Q: How do I ensure maximum bond strength for motor magnets?
• A: Surface preparation is key. Ensure substrates are clean and dry. For cartridge use, always bleed a small amount of adhesive to ensure the 2:1 ratio is balanced before attaching the static mixer.
• Q: Can EP120 bond dissimilar materials like plastic and metal?
• A: Yes. Its inherent toughness allows it to compensate for the different Coefficients of Thermal Expansion (CTE) between metal and plastic, preventing delamination during thermal cycling.
• Q: Will the static mixer clog during production pauses?
• A: Yes. If the pause exceeds the pot life (approx. 60 mins), the adhesive will gel. We recommend purging the mixer periodically or replacing it after extended downtime.

Section 7: Resources & Engineering Support

Empower your structural design with official KEMIBOND EP120 documentation:

📄 [Download KEMIBOND EP120 TDS] 

(Includes detailed curing curves, density charts, and comprehensive mechanical test reports.)

🧪 [Download MSDS / Safety Data Sheet] 

(Safety handling protocols, ventilation requirements, and environmental disposal guidelines.)

👉 [Consult an Assembtek Application Engineer] 

(Our engineers can provide tailored dispensing parameters and substrate testing based on your specific production tact time.)