Black Epoxy Coating Ring Ndfeb

Type: Black Epoxy Coating Ring Ndfeb
Samples: Available
OEM Service: Yes
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Product Details

Black Epoxy Coating Ring Ndfeb 

Material: NdFeB 


Shape:Ring / Donut Magnet

Dimensions: Customized


Coating: Nickel-plated (Ni-Cu-Ni)

Magnetization: Axial (Poles on Flat Ends)

Max. working temperature: 80°C / 176°F

Black Epoxy Coating Ring Ndfeb

        Black Epoxy Coating Ring Ndfeb

Bonded NdFeB magnet is made through "compression molding" or "injection molding" of the mixture of quick-quenched NdFeB magnetic powder and bonding agent. Due to its high accuracy in size, the bonded magnet may be formed into magnetic components of relatively complicated shapes. Also, it features single-time molding and multi-pole orientation. The injection-molded magnet has a high mechanical strength and may be molded together with other matching parts.
We have more mold in stock for multipoles radial ring magnets, please feel free to contact us.

Physical and Mechanical Characteristics:


7.4-7.5   g/cm3

Compression   Strength

950   MPa (137,800 psi)

Tensile   Strength

80   MPa (11,600 psi)

Vickers   Hardness (Hv)


Young's   Modulus

160   GPa (23,200 ksi)

Recoil   Permeability

1.05   μrec

Electrical   Resistance (R)

160   μ-ohm-cm

Heat   Capacity

350-500   J/(kg.°C)

Thermal   Expansion Coefficient (0 to 100°C)
  parallel to magnetization direction

5.2   x 10-6 /°C

Thermal   Expansion Coefficient (0 to 100°C)
  perpendicular to magnetization direction

-0.8   x 10-6 /°C

Plating Characteristics:

Plating   Type

Overall   Thickness

Salt   Spray Test

Pressure   Cooker Test

NiCuNi   (Nickel Copper Nickel)

15-21   μm

24   hours

48   hours

NiCu   + Black Nickel

15-21   μm

24   hours

48   hours

NiCuNi   + Epoxy

20-28   μm

48   hours

72   hours

NiCuNi   + Gold

16-23   μm

36   hours

72   hours

NiCuNi   + Silver

16-23   μm

24   hours

48   hours


7-15   μm

12   hours

24   hours

Each individual layer of Nickel and Copper are 5-7 μm thick. The Gold and Silver plating layers are 1-2 μm thick.
Test results shown to allow comparison between plating options. Performance in your application under your specific test conditions may vary. Salt Spray testing conducted with a 5% NaCl solution, at 35°C. Pressure Cooker Test (PCT) conducted at 2 atm, 120°C at 100% RH.

Product Pictures:

Black Epoxy Coating Multi Poles  Ring Ndfeb

Black Epoxy Coating Ring Ndfeb


Application of Neodymium Magnets

Important Note:

Neodymium magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets.  It is highly recommended that when constructing rare earth magnetic assemblies, they are magnetized after assembly.

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