Sintered NdFeB magnets are manufactured using two forms of pressing.  In both forms, fine NdFeB powder is compacted in a die and then sintered, fusing the powder into a solid material.  In Die Pressing, the powder is placed into a hard die and then pressed [either in the direction of orientation, or transverse to the direction of orientation.  In Isostatic Pressing the powder is placed into a special "rubber" die and then pressed with equal force in all directions on the powder.  Die pressing is generally used for making smaller parts; isostatic pressing for larger parts.  Although the magnetic properties of isostatically pressed parts are higher, the uniformity of magnetic characteristics is usually lower than that of die pressed parts.  Sintered parts normally need some finish machining in order to hold tight dimensional tolerances.

Sintered NdFeB Magnets

Sintered NdFeB Magnets

Sintered NdFeB Magnets

Sintered Neodymium Iron Boron Grades

Grade

Br Nominal

HcB

HcJ

(BH)max

D

Equivalent MMPA Class

% Change Per C

Top*

 

mT

Gs

KA/m

Oe

KA/m

Oe

KJ/m3

MGOe

g/cm3

 

Near Br

Near HcJ

℃

N35

1190

11900

≥868

≥10900

≥955

≥12000

271.0

34.0

7.4

RE 35/12

-0.11

-0.6

80

N38

1240

12400

≥899

≥11300

≥955

≥12000

295.0

37.0

7.4

RE 38/12

-0.11

-0.6

80

N40

1275

12750

≥907

≥11400

≥955

≥12000

311.0

39.0

7.4

RE 40/12

-0.11

-0.6

80

N42

1315

13150

≥915

≥11500

≥955

≥12000

326.0

41.0

7.4

RE 42/12

-0.11

-0.6

80

N45

1350

13500

≥923

≥11600

≥955

≥12000

350.0

44.0

7.4

RE 45/12

-0.11

-0.6

80

N48

1390

13900

≥923

≥11600

≥955

≥12000

370.0

47.0

7.4

RE 48/12

-0.11

-0.6

80

N50

1430

14300

≥796

≥10000

≥876

>11000

380.0

49.0

7.4

RE 50/12

-0.11

-0.6

70

N52

1460

14600

≥796

≥10000

≥876

>11000

404.0

51.0

7.6

RE 52/12

-0.11

-0.6

70

N35M

1190

11900

≥868

≥10900

≥1114

≥14000

271.0

34.0

7.4

RE 35/14

-0.11

-0.6

100

N38M

1240

12400

≥899

≥11300

≥1114

≥14000

295.0

37.0

7.4

RE 38/14

-0.11

-0.6

100

N40M

1275

12750

≥923

≥11600

≥1114

≥14000

311.0

39.0

7.4

RE40/14

-0.11

-0.6

100

N42M

1315

13150

≥955

≥12000

≥1114

≥14000

326.0

41.0

7.4

RE42/14

-0.11

-0.6

100

N45M

1350

13500

≥995

≥12500

≥1114

≥14000

370.0

44.0

7.4

RE 45/14

-0.11

-0.6

100

N48M

1390

13900

≥1027

≥12900

≥1114

≥14000

370.0

47.0

7.4

RE 48/14

-0.11

-0.6

100

N50M

1430

14300

≥1033

≥13000

≥1114

≥14000

380.0

49.0

7.4

RE 48/14

-0.11

-0.6

100

N33H

1150

11400

≥836

≥11300

≥1353

≥17000

255.0

32.0

7.4

RE 33/17

-0.11

-0.6

120

N35H

1190

11900

≥868

≥11600

≥1353

≥17000

271.0

34.0

7.4

RE 35/17

-0.11

-0.6

120

N38H

1240

12400

≥899

≥12000

≥1353

≥17000

295.0

37.0

7.4

RE 38/17

-0.11

-0.6

120

N40H

1275

12750

≥987

≥12400

≥1353

≥17000

311.0

39.0

7.4

RE 40/17

-0.11

-0.6

120

N42H

1315

13150

≥987

≥12400

≥1353

≥17000

326.0

41.0

7.4

RE 42/17

-0.11

-0.6

120

N45H

1350

13500

≥987

≥12400

≥1353

≥17000

350.0

44.0

7.4

RE 44/17

-0.11

-0.6

120

N48H

1390

13900

≥987

≥12400

≥1353

≥17000

370.0

47.0

7.4

RE 48/17

-0.11

-0.6

120

N30SH

1115

11150

≥804

≥12400

≥1592

≥20000

231.0

29.0

7.4

RE 30/20

-0.11

-0.6

150

N33SH

1150

11500

≥844

≥10100

≥1592

≥20000

255.0

32.0

7.4

RE 33/20

-0.11

-0.6

150

N35SH

1195

11950

≥876

≥11000

≥1592

≥20000

271.0

34.0

7.4

RE 35/20

-0.11

-0.6

150

N38SH

1235

12350

≥907

≥11400

≥1592

≥20000

295.0

37.0

7.4

RE 35/20

-0.11

-0.6

150

N40SH

1260

12600

≥939

≥11800

≥1592

≥20000

311.0

39.0

7.4

RE 35/20

-0.11

-0.6

150

N42SH

1300

13000

≥987

≥12400

≥1592

≥20000

326.0

41.0

7.4

RE 35/20

-0.11

-0.6

150

N45SH

1350

13500

≥1003

≥12600

≥1592

≥20000

370.0

44.0

7.4

RE 35/20

-0.11

-0.6

150

N28UH

1060

10600

≥764

≥9600

≥1990

≥25000

269.0

27.0

7.4

RE 28/25

-0.11

-0.6

180

N30UH

1105

11050

≥812

≥10200

≥1990

≥25000

235.0

29.0

7.4

RE 30/25

-0.11

-0.6

180

N33UH

1150

11500

≥852

≥10700

≥1990

≥25000

255.0

32.0

7.4

RE 33/25

-0.11

-0.6

180

N35UH

1200

12000

≥860

≥10800

≥1990

≥25000

271.0

34.0

7.4

RE 35/25

-0.11

-0.6

180

N38UH

1235

12350

≥899

≥11300

≥1990

≥25000

295.0

37.0

7.4

RE 38/25

-0.11

-0.6

180

N40UH

1260

12600

≥899

≥11300

≥1990

≥25000

311.0

39.0

7.4

RE 40/25

-0.11

-0.6

180

N28EH

1065

10650

≥780

≥9600

≥2388

≥30000

269.0

27.0

7.4

RE 28/30

-0.11

-0.6

200

N30EH

1105

11050

≥812

≥9800

≥2388

≥30000

235.0

29.0

7.4

RE 30/30

-0.11

-0.6

200

N33EH

1150

11500

≥836

≥10200

≥2388

≥30000

255.0

32.0

7.4

RE 33/30

-0.11

-0.6

200

N35EH

1195

11950

≥876

≥10500

≥2388

≥30000

271.0

34.0

7.4

RE 35/30

-0.11

-0.6

200

N38EH

1240

12400

≥884

≥11100

≥2388

≥30000

295.0

37.0

7.4

RE 38/30

-0.11

-0.6

200

N28AH

1065

10650

≥787

≥9900

≥2766

≥35000

269.0

27.0

7.4

RE 28/35

-0.11

-0.6

230

N30AH

1105

11050

≥819

≥10300

≥2766

≥35000

235.0

29.0

7.6

RE 30/35

-0.11

-0.6

230

N33AH

1150

11500

≥843

≥10600

≥2766

≥35000

255.0

32.0

7.6

RE 33/35

-0.11

-0.6

230

* Top is the maximum operating temperature, which is dependent upon permeance coefficient, coating and environment.
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