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NdFeB magnet is mainly made from neodymium, iron and boron. With excellent magnetic property、abundant raw material and reasonable prices, NdFeB Magnet is used as an ideal magnet in mini-motor, magnetic resonance imaging, sound device, magnetic suspension system, magnetic transmission machine and iatrical apparatus and etc. For NdFeB, if left it exposed, the iron in the magnet will rust. To protect the magnet from corrosion, it is usually preferable for the magnet to be coated. There are a variety of options for coatings, but nickel is the most common and usually preferred. Some other options for coating are zinc and epoxy.

NdFeB Magnet Magnetic Properties

Grade

Remanence

Coercivity

Intrinsic Coercivity

Max. Energy Products

Working Temp.

°C

Br(T)

H cb

H cj

(BH) max (kJ/m3)

Max

Min

KA/m

KOe

KA/m

Max

min

N35

1.25

1.18

≧ 860

≧12

≧960

295

263

≦ 80

N38

1.30

1.23

≧ 860

≧12

≧960

320

287

≦ 80

N40

1.32

1.27

≧ 876

≧12

≧960

335

302

≦ 80

N42

1.35

1.30

≧ 876

≧12

≧960

350

318

≦ 80

N45

1.38

1.33

≧ 756

≧12

≧960

366

335

≦ 80

N33M

1.22

1.14

≧ 851

≧14

≧1100

279

247

≦ 100

N35M

1.25

1.18

≧ 860

≧14

≧1100

295

263

≦ 100

N38M

1.30

1.23

≧ 876

≧14

≧1100

320

287

≦ 100

N40M

1.32

1.27

≧ 910

≧14

≧1100

335

302

≦ 100

N30H

1.17

1.08

≧ 812

≧17

≧1350

255

223

≦ 120

N33H

1.22

1.14

≧ 844

≧17

≧1350

279

247

≦ 120

N35H

1.25

1.18

≧ 876

≧17

≧1350

295

263

≦ 120

N38H

1.30

1.23

≧ 890

≧17

≧1350

318

287

≦ 120

N40H

1.32

1.27

≧ 939

≧17

≧1353

335

302

≦ 120

N30SH

1.17

1.08

≧ 796

≧20

≧1600

255

223

≦ 150

N33SH

1.22

1.14

≧ 836

≧20

≧1600

279

247

≦ 150

N35SH

1.25

1.18

≧ 876

≧20

≧1600

295

263

≦ 150

N28UH

1.13

1.05

≧ 756

≧25

≧2000

239

207

≦ 180

N30UH

1.17

1.08

≧ 756

≧25

≧2000

255

223

≦ 180

N33UH

1.22

1.14

≧ 756

≧25

≧2000

279

247

≦ 180

Note:
1.The above data are given at temperature 23°C +/-3°C .
2.Max working temperature is changeable due to the length-diameter ratio and environmental facts.
3.According to P.R China standard GB/T 13560-2000


NdFeB Magnet Magnetic Properties

Grade

Remanence

Coercivity

Intrinsic Coercivity

Max. Energy Products

Working Temp.

°C

Br(T)

H cb

H cj

kJ/m3

Max

Min

KA/m

KOe

KA/m

Max

min

N48

1.42

1.38

≧ 11.5

≧12

≧800

398

366

≦ 80

N42M

1.35

1.30

≧ 12.0

≧14

≧1100

350

318

≦ 100

N45M

1.38

1.33

≧ 12.2

≧14

≧1100

366

334

≦ 100

N48M

1.42

1.38

≧ 12.8

≧14

≧1100

398

366

≦ 100

N42H

1.35

1.30

≧ 12.0

≧17

≧1350

350

318

≦ 120

N45H

1.38

1.33

≧ 12.2

≧17

≧1350

366

334

≦ 120

N48H

1.42

1.38

≧ 12.8

≧17

≧1350

398

366

≦ 120

N38SH

1.30

1.23

≧ 11.6

≧20

≧1600

318

287

≦ 150

N40SH

1.32

1.27

≧ 11.8

≧20

≧1600

335

302

≦ 150

N42SH

1.35

1.30

≧ 12.0

≧20

≧1600

350

318

≦ 150

N35UH

1.25

1.18

≧ 11.0

≧25

≧2000

295

263

≦ 180

N28EH

1.13

1.05

≧ 9.8

≧30

≧2400

239

207

≦ 200

N30EH

1.17

1.08

≧ 10.1

≧30

≧2400

255

223

≦ 200

N33EH

1.22

1.14

≧ 10.2

≧30

≧2400

279

247

≦ 200

Note:
•  The above data are given at temperature 23 °C +/ -3 °C .
•  Max working temperature is changeable due to the length-diameter ratio and environmental facts.
•  According to P.R China standard GB/T 13560-2000

   
NdFebB Physical Properites:
Temp.Coeff.Of Br: -0.11%/°C
Density: 7.4g/cm3
Vickers Hardness: 600Hv
Tensile Strength: 8.0kg/mm2
Specific Heat: 0.12k Cak(kg°C)
Young's Modulus: 1.6x1011N/m2
Poisson's Ratio: 0.24
Curie Temperature: 310-340°C
Electrical Resistivity: 144Ω.cm
Flexural Strength: 25kg/mm2
Coeff.of Thermal Expansion: 4x10-6/°C
Thermal conductivity: 7.7cal/m.h.°C
Rigidity: 0.64N/m2
Compressibility: 9.8x10-12m2/N
Temp.Coeff.Of iHc: -0.60%/°C
   
 
 
   
 
 
 
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