Epoxy Coated Neodymium Magnets

Technical Specifications

Temperature resistance

• High temperature resistance up to 380°C (temperature resistance of epoxy coating itself)
• Working temperature range: -30 to 200°C (250°C for 1 hour)
• Maximum operating temperature around 150°C

Coating thickness

• Typical coating thickness is around 15-30 microns
• Recommended film thickness: 20 to 200 μm
• Thickness of epoxy coating without Ni-Cu-Ni: approx. 10 microns
• Recommended dry film thickness: 2 mils minimum up to 8 mils total
• Wet film thickness: 8-12 mils, dry film thickness: 8-12 mils

Corrosion resistance

• Almost 100% non-corrosive, as long as the coating is intact
• Salt spray resistance for 72 hours
• Moisture resistance: 49°C at 98% humidity for 500 hours or more

Adhesion and durability

• Excellent adhesion to the magnet surface
• Not shock-resistant, may crumble or crack under impact
• Tensile hardness (pencil method): 6H

Color options

• Most common color is black
• Other colors like gray, red, and white are available upon request

Application methods

• Can be applied through dipping, spraying, or brushing
• Electrophoretic deposition provides superior uniformity and surface leveling

Electrical properties

• Epoxy is non-conductive, providing electrical insulation to the magnet
• Volume resistivity: 3.2×10^16 to 5.6×10^15 Ω-cm

Chemical resistance

• Resistant to solvents, chemicals, road salt, battery acid, gasoline, and diesel fuel