Epoxy Coated Neodymium Magnet Strong Rectangular,Disc Or Custom Shape Epoxy Coating Black Magnet


1. Material: Sintered neodymium magnet
2. Shape: Disc,Block,Arc and All Shapes
3. Dimensions: As required /Customized
4. Grade: N35,N38,N40,N42,N45,N48,N50,N52,N55 (N,M,H,SH,UH,EH,AH)
5. Coating: Epoxy or NiCu+Epoxy
6. Magnetized: Axial,Diametrical,Through Thickness and etc
7. Max working Temp.: 80℃-220℃
8. Tolerance: +/-0.05mm or +/-0.1mm


Sintered NdFeB magnets greatly expand the applications of permanent magnets.They are widely used in the fields of transportation,energy,communications,home appliances,machinery and medical equipment and have become indispensible function materials in manufacturing and daily life.

Epoxy coated neodymium magnet has great corrosion resistance,NiCu+Epoxy coating is excellent as a barrier for humid environment. 

Available sizes and tolerance of sintered neodymium magnet
Relying on experienced production team and strong maching capability,most sizes of neodymium magnet can be produced with very high quality,and the tolerance can be controlled within +/-0.05mm or +/-0.1mm.

Round/disc neodymium magnet

Magnetization Orientation Diameter Thickness
Axial Mangetized OD  240mm  80mm
Diametrical Magnetized OD  80mm  60mm


Block neodymium magnet

Length Width Thickness
1mm     240mm 1mm   100mm 1mm ≦  80mm


Ring neodymium Magnet

Magnetization Orientation Outer Diameter Inner Diameter Thickness
Axial Mangetized OD 240mm ID  1 T 80mm
Diametrical Magnetized OD 80mm ID  1 T 60mm


Different grade of sintered neodymium magnet
Basis on different temperature resistrance,the neodymium magnet are divided into N,M,H,SH,UH,EH,AH series,and the corresponding maximum operating temperature is 80℃,100℃,120℃,150℃,180℃,200℃,220℃.

In the same serires,the higher the grade of NdFeB magnet,the more magnetism it is.For example,in N series,N52 grade have more magnetic power than N35 grade,and the N55 grade is the strongest one.

For initial projects,we are happy to provide magnetic technology support and made magnet samples according to your requirements for prototyping or testing needs.

Check the grade/properities of sintered neodymium magnet.

Surface treatment of sintered neodymium magnet
For general use,zinc and nickel plating are most common,and the salt spray test can reach 24 hours to 48 hours.
Epoxy or NiCu+Epoxy Coating have a better corrosion resistance,the salt spray test can reach 72 hours.

Coating Type Thickness Clors Resistance
PCT/HAST SST Temp.& Humi.
Zn (White Zn) ≥5 μm Bright Blue —— ★★ ★★★
Zn (Color-plated Zn) ≥5 μm Shining Color —— ★★★ ★★★★
Ni+Cu+N ≥15 μm Silver ★★★ ★★★★ ★★★★★
Ni+Cu+Ni+Cr ≥15 μm Silver ★★★★ ★★★★ ★★★★★
Ni+Cu+Ni+Sn ≥15 μm Silver ★★★★ ★★★★ ★★★★★
Chemic Ni ≥5 μm Silver ★★★★ ★★★★★ ★★★★★
Epoxy ≥12 μm Black ★★★ ★★★★★ ★★★★★
NiCu+Epoxy ≥15 μm Black ★★★ ★★★★★ ★★★★★
Passivated ≤2 μm Silver Grey —— —— ★★★
Phosphated ≤2 μm Silver Grey —— —— ★★★

Magnetization orientation of neodymium magnet









Axial Magnet Diametrical Magnetized Axial Magnetized Diametrical Magnetized




Axial Magnetized
Diametrical Magnetized Axial Magnetized (N-S) Axial Magneized (S-N)




Through Thickness Through Width Through Length Diametrical Magnetized




Diametrical Magnetized
 (N-S)
Diametrical Magnetized
 (S-N)
Through Thickness Through Width




Radial Magnetized
2 Poles

Radial Magnetiezd
8 poles

Radial Magnetized Skewed
8 Poles


Axial Magnetized





Silimar Products Show
Mechanical Physical Property Of Sintered NdFeB Magnet
 Parameter Unit Reference Value
 Vickers hardness Hv ≥550
 Density g/cm3 ≥7.50
 μr Recal Penmeability 1.05
 Tc Curie point 312~380
 Specific resistance μΩ·cm 150
 Bending strength MPa 250
 Compressive strength MPa 1000~1100
 Compressive strength Thermal expansion ℃-1 - (1~3)×10-6K
(⊥Thermal expansion) (⊥)
 Compressive strength Thermal expansion ℃-1 (34)×106K
(∥Thermal expansion) (∥)


Demagnetization Curves Of Sintered NdFeb Magnet (B-H Curves)



N52 N50M


N48SH N45UH


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E-mail:LZ@junhuimagnet.com

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