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Sintered Neodymium Iron Boron (NdFeB) Magnets
ContentsCharacteristic magnetic properties at room temperature (20°C)
Remarks on table
Physical properties at room temperature (20°C)
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N35N38N40N42N45N48N50N52N33MN35MN38MN40M
N42MN45MN48MN50MN30HN33HN35HN38HN40HN42HN44HN46H
N48HN30SHN33SHN35SHN38SHN40SHN42SHN44SHN46SHN28UHN30UHN33UH
N35UHN38UHN40UHN28EHN30EHN33EHN35EHN38EHN25AHN28AHN30AHN25BH
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4
5
6
7
8
9
10
11
12
13
14
15
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Demagnetisation curves
Page No. Magnet grade Page No. Magnet grade Page No. Magnet grade Page No. Magnet grade
1
N35N38N40N42N45N48N50N52N33MN35MN38MN40MN42MN45MN48MN50MN30HN33HN35HN38HN40HN42HN44HN46HN48HN30SHN33SHN35SHN38SHN40SHN42SHN44SHN46SHN28UHN30UHN33UHN35UHN38UHN40UHN28EHN30EHN33EHN35EHN38EHN25AH
N28AH
N30AH
N25BH
Grade
8080808080807070
100100100100100100
9090
120120120120120120120120120150150150150150150150150180180180180180180200200200200200220
220
220
230
Max. operating
temp.
min11701220126013001330137014101440114011701220126013001330137014101080114011701220126013001330136013801080114011701220126013001330136010401080114011701220126010401080114011701220
970
1040
1080
950
typ122012601300133013701410144014701170122012601300133013701410144011401170122012601300133013601380141011401170122012601300133013601380108011401170122012601300108011401170122012601020
1080
1140
1000
RemanenceBRmT
min870870870870900900830830830870900930950980
10101030
810830870900930950970980
1010810830870900930950970980770810830870900930770810830870900730
770
810
710
typ920920920920930930850850880920950980
1000103010601080
860880920950980
1000102010401060
860880920950980
100010201040
810860880920950980810860880920950770
810
860
750
Normal coercivityHcb
kA/m
min263279303318334358382398239263279303318334358382223239263279303318334350366223239263279303318334350199223239263279303199223239263279180
203
220
170
typ279303318334358382398414263279303318334358382398239263279303318334350366382239263279303318334350366223239263279303318223239263279303200
218
250
190
Mass energy productBH(max)kJ/m3
min955955955955955955875875
1114111411141114111411141114111413531353135313531353135313531353135315921592159215921592159215921592198919891989198919891989238723872387238723872787
2787
2787
3000
Intrinsic coercivity
HcjkA/m
Sintered NdFeB magnetsCharacteristic magnetic properties at room temperature (20°C)
iHc at 150°C, min. 1200KA/miHc at 180°C, min. 900KA/m
iHc at 150°C, min. 1200KA/miHc at 180°C, min. 900KA/m
iHc at 150°C, min. 1200KA/miHc at 180°C, min. 900KA/m
iHc at 150°C, min. 1300KA/miHc at 180°C, min. 950KA/m
2
Remarks on facing table
1 The max working temperature is only for reference, it is dependent on the circuit in which the magnet is operating.
2 Customers are advised to consult us on any application involving temperatures near to 150°C.
3 When L/D = 0.7, the magnet can be operated at maximum working temperature before irreversable losses occur.
Temp. Coeff. Of Br −0.11%/°C
Density 7.5/cm³
Vickers Hardness 600Hv
Tensile Strength 8.0kg/mm²
Specific Heat 0.12 kcal/(kg,°C)
Young's Modulus 1.6 × 10¹¹N/m²
Poisson's Ratio 0.24
Curie Temperature 310–340°C
Temp. Coeff of iHc −0.60%/°C
Electrical Resistivity 144 μΩ.cm
Flexural Strength 25kg/mm
Coeff. Of Thermal Expansion 4×10–6/°C
Thermal Conductivity 7.7 kcal/(m.h. °C)
Rigidity 0.64N/m²
Compressibility 9.8 × 10–¹²m²/N
Physical properties at room temperature (20°C)
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
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Demagnetisation curves
26
Eclipse Magnetics LtdAtlas Way, Atlas North, Sheffield, S4 7QQ, EnglandT +44 (0)114 225 0600 F +44 (0)114 225 0610 sales@eclipse-magnetics.co.uk www.eclipse-magnetics.co.uk
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