Neodymium Magnets

Introduced in 1983, the Sintered Neodymium Iron Boron (NdFeB) magnet stands as a remarkable innovation primarily composed of neodymium, iron, and boron. Its intrinsic coercivity far surpasses that of ferrite by a remarkable margin of 5-10 times, and exceeds aluminum-nickel-cobalt by a remarkable margin of 6-10 times. Remarkably, it boasts a maximum energy product that is a staggering 5-15 times greater than ferrite, firmly establishing it as the pinnacle of contemporary magnetic materials. In comparison with conventional magnetic materials, it not only exhibits exceptional magnetic properties but also stands out for its remarkable cost-effectiveness, thereby unlocking an extensive array of possibilities for magnetic material applications.


Product Detail

Product Tags

Physical Properties

Br Temperature Coefficient

-0.095~-0.105%/°C

Density

7.3-7.5g/cm3

Curie Temperature

310-340°C

Coercivity Temperature Coefficient

-0.45~-0.60%/°C

Vickers-hardness

600HV

Electrical Resistivity

114μΩ·cm

 Across Transfiguration Coefficient

0.24

Break Strength

8.0Kgf/mm2

Bending Strength

25kgf/mm2

Thermal Expansion Coefficient

4x10-6/°C

Specific Heat

0.12Kcal/Kg

Stiffness

0.64N/m2

The Conduction Coefficient

7.7kcal/[m.h. °C]

Young's Modulus

1.6x1011N/m2

Compressibility

9.8x10-12m2/N

Surface Treatment

Coating

Thickness

(μm)

Color

SST

(hrs)

PCT/HAST

(hrs)

Operation Temperature (°C)

Corrosive Resistance

Application

Zn

4-15

Bright blue

24

≤160

Good

Suitable for working conditions with low corrosive and humidity requirements.

Ni-Cu-Ni

5-20

Bright silver

48

48

≤200

Excellent

Most regular used multi-layer coating.

Electroless Ni

5-20

Dark silver

72

48

≤200

Excellent performance with uniform appearance.

Suitable for working conditions with high corrosive and humidity requirements.

Ni-Cu-Ni-Au

5-20

Golden

72

96

≤200

Good

Suitable for parts that placed into the high reliable electronic equipments or decoration.

Ni-Cu-Ni-Ag

5-20

Silver

72

96

≤160

Good

Suitable for parts that may be welded or placed into the electric equipment.

Ni-Cu-Ni-Sn

5-20

Silver

72

96

≤200

Excellent

Suitable for parts that may be welded or placed into electric equipment.

Passivation

1-3

Dark grey

≤200

Poor

Temporary protection.

Aluminum

2-15

Bright silver

240

168

≤400

Excellent

Suitable for working conditions with very high corrosive and humidity requirements.

Epoxy resin

10-30

Black/Grey

96

24

≤160

Excellent. Superior binding force.

Suitable for parts used to insulate the electric equipments or placed in the high corrosive industrial atmosphere.

Parylene

5-20

Colorless

168

≤200

Excellent

Free of pore. Suitable for biomedical applications.

Everlube

10-15

Golden yellow

96

72

≤200

Excellent

Suitable for working conditions with very high corrosive and humidity requirements.

Note:

1. The SST results differ from coating. In general, Salt Spray Test results, which is coated by grinding (small size magnets), is better than the one, which is coated by hanging up (big size magnets).

2. Salt Spray Test (SST) condition: 5% NaCl, 35℃, continuously spray a certain time, test whether there is corrosion on coating surface.

3. Pressure Cooking Test (PCT) condition: 2 atm, 95% RH (relative humidity), 121℃ to test the coating adhesion. (Zinc, Passivated, and Epoxy are not suitable for PCT).

4. Other test methods for coating: Drop Test, Cross Cut test, Heating and Spilling Test, Constant Temperature and Humidity Test and etc.

Magnetic properties

Series

Grade

Br

Hcb

Hcj

(BH)max

TW

mT

KGs

KA/m

kOe

kA/m

kOe

kJ/m3

MGOe

°C

N

N35

1170-1220

11.7-12.2

≥868

≥10.9

≥955

≥12

263-287

33-36

≤80

N38

1220-1250

12.2-12.5

≥899

≥11.3

≥955

≥12

287-310

36-39

≤80

N40

1250-1280

12.5-12.8

≥907

≥11.4

≥955

≥12

302-326

38-41

≤80

N42

1280-1320

12.8-13.2

≥915

≥11.5

≥955

≥12

318-342

40-43

≤80

N45

1320-1380

13.2-13.8

≥923

≥11.6

≥955

≥12

342-366

43-46

≤80

N48

1380-1420

13.8-14.2

≥923

≥11.6

≥955

≥12

366-390

46-49

≤80

N50

1400-1450

14.0-14.5

≥860

≥10.8

≥955

≥12

382-406

48-51

≤80

N52

1430-1480

14.3-14.8

≥860

≥10.8

≥955

≥12

398-422

50-53

≤80

N54

1460-1500

14.6-15.0

≥860

≥10.8

≥955

≥12

414-438

53-57

≤80

N56

1480-1520

14.8-15.2

≥836

≥10.5

≥875

≥11

422-454

53-57

≤80

M

35M

1170-1220

11.7-12.2

≥868

≥10.9

≥1114

≥14

263-287

33-36

≤100

38M

1220-1250

12.2-12.5

≥899

≥11.3

≥1114

≥14

287-310

36-39

≤100

40M

1250-1280

12.5-12.8

≥923

≥11.6

≥1114

≥14

302-326

38-41

≤100

42M

1280-1320

12.8-13.2

≥955

≥12.0

≥1114

≥14

318-342

40-43

≤100

45M

1320-1380

13.2-13.8

≥995

≥12.5

≥1114

≥14

342-366

43-46

≤100

48M

1360-1430

13.6-14.3

≥1027

≥12.9

≥1114

≥14

366-390

46-49

≤100

50M

1400-1450

14.0-14.5

≥1033

≥13.0

≥1114

≥14

382-406

48-51

≤100

52M

1420-1480

14.2-14.8

≥1043

≥13.1

≥1114

≥14

398-422

50-53

≤100

54M

1450-1500

14.5-15.0

≥995

≥12.5

≥1035

≥13

406-438

51-55

≤100

H

35H

1170-1220

11.7-12.2

≥868

≥10.9

≥1353

≥17

263-287

33-36

≤120

38H

1220-1250

12.2-12.5

≥899

≥11.3

≥1353

≥17

287-310

36-39

≤120

40H

1250-1280

12.5-12.8

≥923

≥11.6

≥1353

≥17

302-326

38-41

≤120

42H

1280-1320

12.8-13.2

≥955

≥12.0

≥1353

≥17

318-342

40-43

≤120

45H

1300-1360

13.0-13.6

≥963

≥12.1

≥1353

≥17

326-358

43-46

≤120

48H

1370-1430

13.7-14.3

≥995

≥12.5

≥1353

≥17

366-390

46-49

≤120

50H 1400-1450 14.0-14.5 ≥1003 ≥12.6 ≥1353 ≥17 382-406 48-51 ≤120
52H 1420-1480 14.2-14.8 ≥1035 ≥13.0 ≥1353 ≥17 390-422 49-53 ≤120

SH

33SH

1130-1170

11.3-11.7

≥860

≥10.6

≥1592

≥20

247-271

31-34

≤150

35SH

1170-1220

11.7-12.2

≥876

≥11.0

≥1592

≥20

263-287

33-36

≤150

38SH

1220-1250

12.2-12.5

≥907

≥11.4

≥1592

≥20

287-310

36-39

≤150

40SH

1240-1280

12.5-12.8

≥939

≥11.8

≥1592

≥20

302-326

38-41

≤150

42SH

1280-1320

12.8-13.2

≥963

≥12.1

≥1592

≥20

318-342

40-43

≤150

45SH

1320-1380

13.2-13.8

≥979

≥12.3

≥1592

≥20

342-366

43-46

≤150

48SH 1370-1430 13.7-14.3 ≥1019 ≥12.8 ≥1592 ≥20 366-390 46-49 ≤150
50SH 1400-1450 14.0-14.5  ≥1019 ≥12.8 ≥1592 ≥20 374-406 47-51 ≤150
52SH 1420-1480 14.2-14.8 ≥1035 ≥13.0 ≥1512 ≥19 390-422 49-53 ≤150

UH

28UH

1020-1080

10.2-10.8

≥764

≥9.6

≥1990

≥25

207-231

26-29

≤180

30UH

1080-1130

10.8-11.3

≥812

≥10.2

≥1990

≥25

223-247

28-31

≤180

33UH

1130-1170

11.3-11.7

≥852

≥10.7

≥1990

≥25

247-271

31-34

≤180

35UH

1180-1220

11.8-12.2

≥860

≥10.8

≥1990

≥25

263-287

33-36

≤180

38UH

1220-1250

12.2-12.5

≥899

≥11.0

≥1990

≥25

287-310

36-39

≤180

40UH

1250-1280

12.5-12.8

≥939

≥11.3

≥1990

≥25

302-326

38-41

≤180

42UH 1280-1320 12.8-13.2 ≥963 ≥12.1 ≥1990 ≥25 318-342 40-43 ≤180
45UH  1320-1380  13.2-13.8  ≥979 ≥12.3 ≥1990 ≥25 342-366 43-46 ≤180
48UH  1380-1420  13.8-14.2  ≥1019 ≥12.8 ≥1910 ≥24 366-390 46-49 ≤180

EH

28EH

1040-1090

10.4-10.9

≥780

≥9.8

≥2388

≥30

207-231

26-29

≤200

30EH

1080-1130

10.8-11.3

≥812

≥10.2

≥2388

≥30

223-247

28-31

≤200

33EH

1130-1170

11.3-11.7

≥836

≥10.5

≥2388

≥30

247-271

31-34

≤200

35EH

1170-1220

11.7-12.2

≥876

≥11.0

≥2388

≥30

263-287

33-36

≤200

38EH

1220-1250

12.2-12.5

≥899

≥11.3

≥2388

≥30

287-310

36-39

≤200

40EH 1250-1280 12.5-12.8 ≥923 ≥11.6 ≥2388 ≥30 302-326 38-41 ≤200
42EH 1280-1320 12.8-13.2 ≥931 ≥11.7 ≥2388 ≥30 318-342 40-43 ≤200
45EH 1330-1380 13.3-13.8 ≥995 ≥12.5 ≥2308 ≥29 342-366 43-46 ≤200

AH

28AH

1040-1090

10.4-10.9

≥787

≥9.9

≥2624

≥33

207-231

26-29

≤230

30AH

1080-1130

10.8-11.3

≥819

≥10.3

≥2624

≥33

223-247

28-31

≤230

33AH

1130-1170

11.3-11.7

≥843

≥10.6

≥2624

≥33

247-271

31-34

≤230

35AH 1170-1220 11.7-12.2 ≥876 ≥11.0 ≥2624 ≥33 263-287 33-36 ≤230
38AH 1220-1250 12.2-12.5 ≥899 ≥11.3 ≥2624 ≥33 287-310 36-39 ≤230
40AH  1250-1280  12.5-12.8  ≥923 ≥11.6 ≥2624 ≥33 302-326 38-41 ≤230
42AH  1290-1330  12.9-13.3  ≥955 ≥12.0 ≥2624 ≥33 318-342 40-43 ≤230

Temperature Characteristics

Low grade Neodymium magnet may lose strength if heated above 80°C. High grade Neo magnets have been developed to function at temperatures up to 220°C with little irreversible loss. The need for low temperature coefficient in neodymium magnet applications has triggered several grades to be developed to meet specific operating requirements. 

Application

The utility of Sintered NdFeB magnet extends across a wide spectrum of industries, including but not limited to electronics (such as mobile phones and hard drives), automotive engineering (in motors and sensors), medical technology (in MRI machines), and the energy transportation sector. As technology continues to advance, Sintered NdFeB magnet is poised for significant growth in emerging areas such as electric vehicles, wind power generation, and energy-efficient household appliances. This material has redefined the boundaries of what is achievable in the field of magnetic materials, making it a cornerstone of modern engineering.

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