Magnetic Performance Parameters

Sintered Neodymium Magnet Grades:

Many grades of Neodymium magnets exist to support a variety of industrial applications. The range of Neo grades typically extends from 33 MGOe to 52 MGOe. This range allows for optimizing cost, performance, and operational temperature resistance.

The typical convention for “Grade” is to use the value of the particular magnet alloy’s Energy Density or Maximum Energy Product. Oftentimes there are letters or a two digit number suffix attached to the Grade which indicates the Intrinsic Coercive Force (Hci) level of the magnet alloy. This Hci is a good indicator of the maximum allowable temperature a particular Neo alloy can tolerate before irreversible demagnetizing occurs.

The higher the “Grade number” then the higher the Energy Density. Usually the higher the Energy Density the stronger the magnet, but this is very much dependent upon the magnet’s operational environment.

1.Magnetic Property Distribution Chart:

Magnetic Property Distribution

Magnetic Property Distribution

 

2.Magnetic Properties of Sintered NdFeB Magnets:

3. Typical Physical Properties:

Bonded Neodymium Magnet Grades:

performance parameter of bonded ndfeb magnet

performance parameter of bonded ndfeb magnet

Magnetic Characteristic and Physical Properties Of Bonded Neodymium Magnet:

 

COMPRESSION MOLDED BONDED NEODYMIUM GRADES​

Grade

Residual Induction
Br T(KG)

Coercive Force
bHc KA/m (KOe)

Intrinsic Coercive Force
iHc KA/m (KOe)

Maximum Energy Product
(BH)max KJ/m^3 (MGOe)

Density D
g/cm^3

Reversible Permeability

Reversible Temp Coefficient A
Br%/°C

Max Operating Temp

BNP-2

300-400
(3.0-4.0)

160-240
(2.0-3.0)

440-600

(5.5-7.5)

19-26
(2.4-3.3)

  5.6-6.0

1.20

-0.11

   160

BNP-3

400-510
(4.0-5.1)

216-280
(2.7-3.5)

504-680
(6.3-8.5)

24-32
(5.6-6.0)

  5.6-6.0

1.20

-0.11

   160

BNP-4

460-520
(4.6-5.2)

224-288
(2.8-3.6)

504-680
(6.3-8.5)

30-35
(3.8-4.4)

  5.6-6.0

1.20

-0.11

   160

BNP-5

470-550
(4.7-5.5)

240-360
(3.0-4.5)

520-680
(6.5-8.5)

37-44
(4.7-5.5)

  5.6-6.0

1.20

-0.11

   160

BNP-6

650-700
(6.5-7.0)

456-512
(5.7-6.4)

600-720
(7.5-9.0)

80-96
(10-12)

  5.6-6.0

1.20

-0.11

   160

BNP-7

550-650
(5.5-6.5)

320-408
(4.0-5.1)

560-680
(7.0-8.5)

52-64
(6.5-8.0)

  5.6-6.0

1.20

-0.11

   160

BNP-8

620-670
(6.2-6.7)

400-456
(5.0-5.7)

640-800
(8.0-10.0)

64-76
(8.0-9.5)

  5.8-6.2

1.20

-0.11

   160

BNP-8A

620-680
(6.2-6.8)

400-480
(5.0-6.0)

1040-1280
(13.0-16.0)

65-73
(8.2-9.2)

  5.8-6.1

1.20

-0.10

   180

BNP-9L

650-700
(6.5-7.0)

360-416
(4.5-5.2)

520-640
(6.5-8.0)

68-75
(8.6-9.4)

  5.8-6.1

1.20

-0.11

   120

BNP-9

650-700
(6.5-7.0)

416-456
(5.2-5.7)

680-800
(8.5-10.0)

68-76
(8.5-9.5)

  5.8-6.2

1.20

-0.12

   160

BNP-9H

650-700
(6.5-7.0)

432-488
(5.4-6.1)

920-1040
(11.5-13.0)

71-80
(8.9-10.0)

  5.8-6.1

1.20

-0.10

   180

BNP-10H

650-710
(6.5-7.1)

432-480
(5.4-6.0)

764-960
(9.8-12.0)

74-82
(9.3-10.3)

  5.8-6.1

1.20

-0.10

   180

BNP-10

670-720
(6.7-7.2)

424-480
(5.3-6.0)

640-800
(8-10)

76-84
(9.5-10.5)

  5.8-6.2

1.20

-0.10

   160

BNP-11

680-740
(6.8-7.4)

400-480
(5.0-6.0)

640-800
(8-10)

80-88
(10-11)

  6.0-6.2

1.20

-0.10

   180

BNP-12D

720-770
(7.2-7.7)

440-520
(5.5-6.5)

720-880
(9.0-11.0)

88-96
(11.0-12.0)

  6.1-6.3

1.20

-0.10

   160

BNP-12L

730-770
(7.3-7.7)

368-432
(4.6-5.4)

520-640
(6.5-8.0)

80-88
(10.0-11.0)

  6.0-6.3

1.20

-0.12

   120

BNP-13L

780-830
(7.8-8.3)

400-80
(5.0-6.0)

480-640
(6.0-8.0)

88-104
(11.0-13.0)

  6.1-6.4

1.20

-0.12

   120

​

INJECTION MOLDED BONDED NEODYMIUM GRADES

Grade

Residual Induction
Br T(KG)

Coercive Force
bHc KA/m (KOe)

Intrinsic Coercive Force
iHc KA/m (KOe)

Maximum Energy Product
(BH)max KJ/m^3 (MGOe)

Density D
g/cm^3

Reversible Permeability

Reversible Temp Coefficient A
Br%/°C

Max Operating Temp

BNI-3

350-450

(3.5-4.5)

200-280

(2.5-3.5)

400-640

(5.0-8.0)

20-28

(2.5-3.5)

4.5-5.0

1.20

-0.11

   120
BNI-4

400-500

(4.0-5.0)

240-320

(3.0-4.0)

560-720

(7.0-9.0)

28-36

(3.5-4.5)

4.5-5.0

1.20

-0.11

   120
BNI-5

450-550

(4.5-5.5)

304-360

(3.8-4.5)

640-800

(8.0-10.0)

36-44

(4.5-5.5)

4.5-5.1

1.20

-0.11

   120
BNI-5SR

450-550

(4.5-5.5)

320-400

(4.0-5.0)

880-1120

(11.0-14.0)

36-44

(4.8-5.5)

4.8-5.3

1.20

-0.11

   180
BNI-6

500-600

(5.0-6.0)

328-384

(4.1-4.8)

640-800

(8.0-10.0)

44-52

(5.5-6.5)

4.7-5.2

1.20

-0.11

   120
BNI-6SR

500-600

(5.0-6.0)

320-400

(4.0-5.0)

880-1120

(11.0-14.0)

44-52

(5.5-6.5)

4.9-5.4

1.20

-0.11

   180
BNI-7

550-650

(5.5-6.5)

344-400

(4.3-5.0)

640-800

(8.0-10.0)

52-60

(6.5-7.5)

4.7-5.3

1.20

-0.12

   120

 

SmCo

Samarium Cobalt magnets (SmCo) is the sister Rare Earth Magnet to NdFeB. SmCo is sometimes called a Rare Earth Cobalt magnet. SmCo magnets exist in two alloy varieties.Samarium Cobalt Magnet Grades:

Sm1Co5 (SmCo1:5) is the original SmCo alloy.
Sm2Co17 (SmCo2:17) is the more common used and stronger SmCo alloy with SmCo26 being the most popular variety.
Sm1Co5 contains mainly Sm and Co and contains no iron (Fe) so it has excellent corrosion resistance -it should never corrode with water.

Sm2Co17 is mainly Sm and Co but also contains Cu, Hf &/or Zr, sometimes Pr, and Fe. The low free iron content in Sm2Co17 means it is technically prone to a little surface corrosion when in water.

Sm2Co17 is regarded as having good to very good corrosion resistance (far superior to NdFeB) in most applications. A simple coating of NiCuNi will very likely solve any risk of corrosion.

1, Magnetic Property

Sm1Co5 grade

Sm1Co5 grade

Sm2Co17 grade

Sm2Co17 grade

2, Corrosion Resistance

Corrosion resistance:- SmCo(1:5) Exellent (has no iron); SmCo(2:17) Good to Very Good (has some free iron). SmCo magnets can usually be used in humid applications without any need for a protective coating. In wet envrironments, coating of SmCo(2:17) in NiCuNi is recommended to avoid surface corrosion issues. NiCuNi plated SmCo is claimed by some to limit chipping and allows for soldering as well but is rarely done.

Physical Characteristics (excluding bonded variants)

Physical Characteristics of SmCo

Physical Characteristics of SmCo

Alnico Magnet Grades:

The range of Alnico magnet alloy grades available from MPCO Magnetics typically extends from 1.5 – 5.25 MGOe for sintered Alnico and 5.0 – 9.0 for cast Alnico. This range allows for optimizing the cost, performance, and operational temperature resistance for a wide range of applications.

Sintered Alncio magnets are made with a powdered metal process. Lower grades are Isotropic, which can be magnetized in any direction, but at a loss of magnetic strength. The powder metal version of Alnico allows for easier integration of features since a tool is used and the magnet is finished to near net shape. (Sometimes the tooling cost can be a project inhibitor for small production quantities.) Cast Alnico magnets are cast in sand molds and usually require finish grinding. Casting Alnico is the most typical manufacturing method and most cast Alncio is “orientated” and anisotropic. This means that the magnet can only be magnetized in one direction, but this improves the magnetic strength.

Sintered Alnico – Available Grades
GradeResidual
Induction
Br		Coercive
Force
Hc		Intrinsic
Coercive
Force
Hci		Maximum
Energy
Product
(BH)max		Max.
Operating
Temp.*
NominalNominalMinimumNominalNominal
k-GaussTeslaOerstedkA/mOerstedkA/mMGOekJ/m3°C°F
Alnico 27.00.750040540431.512450°C840°F
Alnico 511.01.160048600484.2534450°C840°F
Alnico 88.80.881,5301211.6001275.2542450°C840°F
* The listed maximum operating temperatures are based on an adequate Length to Diameter ratio or a properly designed magnetic circuit. The listed values are for reference and validation must occur before one chooses a design path.

 

Cast Alnico – Available Grades
GradeResidual
Induction
Br		Coercive
Force
Hc		Intrinsic
Coercive
Force
Hci		Maximum
Energy
Product
(BH)max		Max.
Operating
Temp.*
NominalNominalMinimumNominalNominal
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3°C°F
Alnico 512.21.2260048630505.040500°C930°F
Alnico 5B12.21.2265052660535.544500°C930°F
Alnico 5 DG12.51.2569055700566.552500°C930°F
Alnico 5-713.01.370056740597.560525°C980°F
Alnico 8-HC 7.00.71,7501391,7501394.536525°C980°F
Alnico 88.20.821,5001191,6001275.040525°C980°F
Alnico 8B8.80.881,5001191,6501315.544525°C980°F
Alnico 8C9.00.91,3801101,4401157.560525°C980°F
Alnico 910.51.051,4101121,4401399.072525°C980°F
* The listed maximum operating temperatures are based on an adequate Length to Diameter ratio or a properly designed magnetic circuit. The listed values are for reference and validation must occur before one chooses a design path.

 

Reversible Temperature Coefficient for Cast and Sintered Alnico
Temperature Range
(°C)		Induction Br (α)
(%)/°C		Intrinsic Coercivity Hci (β)
(%)/°C
20°C to 150°C-0.02 to -0.03-0.02 to -0.03
α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = 20°C – 150°C]
β = Δ Hci / Δ T * 100 (Hci @ 20°C) [ΔT = 20°C – 150°C]

 

Alnico Magnets – Physical Properties
PropertyUnitsValue Sintered AlnicoValue Cast Alnico
Vickers HardnessHv440440-620
Densityg/cm36.8 – 7.06.9 – 7.3
Curie Temp TC°C810 – 860740 – 860
Curie Temp TF°F1,400 – 1,5801,460 – 1,580
Specific ResistanceμΩ⋅Cm50- 7045 – 75
Bending StrengthkN/mm20.35 – 0.760.05 – 0.31
Tensile StrengthkN/mm20.35- 0.450.02 – 0.15
Thermal Expansion°C-1+11.0 to +12.4 x10-6+11.0 to +13.0 x10-6
The listed values are approximate and should be used as a reference. Any magnetic or physical characteristics should be substantiated before selecting a magnet material.

Hard Sintered Ferrite & Ceramic Magnet Grades:

Magnetic properties of Sintered Ferrite Magnet (ceramic magnets, Hard ferrite magnet)
Chinese standard
Material
Br
Hcb
Hcj
(BH)max
mT
KGs
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
Y10T200~2352.0~2.35125~1601.57~2.01210~2802.64~3.526.5~9.50.8~1.2
Y20320~3803.2~3.8135~1901.70~2.38140~1951.76~2.4518.0~22.02.3~2.8
Y22H310~3603.1~3.6220~2502.77~3.14280~3203.52~4.0220.0~24.02.5~3.0
Y23320~3703.2~3.7170~1902.14~2.38190~2302.39~2.8920.0~25.52.5~3.2
Y25360~3803.6~4.0135~1701.70~2.14140~2001.76~2.5122.5~28.02.8~3.5
Y26H360~3903.6~3.9220~2502.77~3.14225~2552.83~3.2123.0~28.02.9~3.5
Y27H370~4003.7~4.0205~2502.58~3.14210~2552.64~3.2125.0~29.03.1~3.7
Y30370~4003.7~4.0175~2102.20~2.64180~2202.26~2.7726.0~30.03.3~3.8
Y30BH380~3903.8~3.90223~2352.80~2.95231~2452.90~3.0827.0~30.03.4~3.7
Y30-1380~4003.8~4.0230~2752.89~3.46235~2902.95~3.6527.0~32.03.4~4.0
Y30H-2395~4153.95~4.15275~3003.46~3.77310~3353.90~4.2128.5~32.53.5~4.0
Y32400~4204.0~4.2160~1902.01~2.38165~1952.07~2.4530.0~33.53.8~4.2
Y33410~4304.1~4.3220~2502.77~3.14225~2552.83~3.2131.5~35.04.0~4.4
Y35400~4104.00~4.10175~1952.20~2.45180~2002.26~2.5130.0~32.03.8~4.0
USA standard
Material
Br
Hcb
Hcj
(BH)max
mT
KGs
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
C12302.31481.862583.58.361.05
C53803.81912.41992.5273.4
C73403.42583.233184.0021.92.75
C8(=C8A)3853.852352.952423.0527.83.5
C8B4204.22322.9132362.9632.84.12
C93803.82803.5163204.0126.43.32
C104004.02883.6172803.5130.43.82
C114304.32002.5122042.5634.44.32
Europe standard
The standard from International Electronics Committee (IEC404-8-1)
O×100=Y10T=C1   ×300=Y30=C5   O×330=Y30 BH
Grade
Allowed Value (min-typical)
Br
Hcb
BrHcj
(BH)max
mT
KGs
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
HF8/22200-2202.00-2.20125-1401.57-1.76220-2302.76-2.896.5-6.80.8-1.1
HF20/19320-3333.20-3.33170-1902.14-2.39190-2002.39-2.5120.0-21.02.5-2.7
HF20/28310-3253.10-3.25220-2302.76-2.89280-2903.52-3.6420.0-21.02.5-2.7
HF22/30350-3653.50-3.65255-2653.20-3.33290-3003.64-3.7722.0-23.52.8-3.0
HF24/16350-3653.50-3.65155-1751.95-2.20160-1802.01-2.2624.0-25.53.0-3.2
HF24/23350-3653.50-3.65220-2302.76-2.89230-2402.89-3.0124.0-25.53.0-3.2
HF24/35360-3703.60-3.70260-2703.27-3.39350-3604.40-4.5224.0-25.53.0-3.2
HF26/16370-3803.70-3.80155-1751.95-2.20160-1802.01-2.2626.0-27.03.2-3.4
HF26/18370-3803.70-3.80175-1902.20-2.39180-1902.26-2.3926.0-27.03.3-3.4
HF26/24370-3803.70-3.80230-2402.89-3.01240-2503.01-3.1426.0-27.03.3-3.4
HF26/26370-3803.70-3.80230-2402.89-3.01260-2703.27-3.3926.0-27.03.3-3.4
HF26/30385-3953.85-3.95260-2703.27-3.39300-3103.77-3.8926.0-27.03.3-3.4
HF28/26385-3953.85-3.95250-2653.14-3.33260-2753.27-3.4528.0-30.03.5-3.8
HF28/28385-3953.85-3.95260-2703.27-3.39280-2903.50-3.6028.0-30.03.5-3.8
HF30/26395-4053.95-4.05250-2603.14-3.33260-2703.27-3.3930.0-31.53.8-3.9
HF32/17410-4204.10-4.20160-1802.01-2.26165-1752.07-2.2032.0-33.04.0-4.1
HF32/22410-4204.10-4.20215-2252.70-2.83220-2302.76-2.8932.0-33.04.0-4.1
HF32/25410-4204.10-4.20240-2503.01-3.14250-2603.14-3.2732.0-33.04.0-4.1

 

 

Ceramic Magnets – Physical Properties
PropertyUnitsValue Ceramic (Strontium Ferrite)
Vickers HardnessHv~ 1160 (7 Mohs)
Densityg/cm34.5 to 5.1
Curie Temp TC°C450 to 460
Curie Temp TF°F840 to 860
*Specific ResistanceμΩ⋅Cm> 106
Bending StrengthkN/mm20.05 – 0.09
Tensile StrengthkN/mm2.02 to .05
Thermal Expansion (∥)°C-1+11.0 to +16.0 x10-6
Thermal Expansion (⊥)°C-1‘+7.0 to +15.0 x 10-6
* The effective resistance may change based on the powder blend. Barium Ferrite has higher resistivity than Strontium Ferrite. Some Ceramic magnets are a blend. To ensure the correct design path is chosen execute due diligence by evaluating the magnet alloy on a case by case basis.

 

Injection Bonded Ferrite & Ceramic Magnet Grades:

 

Magnetic Properties of Injection Ferrite Bonded Magnet
TYPE NO.BinderMagnet MaterialBr
(mT)
Gs		HCB
(kA/m)
Oe		HCJ
(kA/m)
Oe		(BH)max
kJ/m3
MGOe		Density
(g/cm3)		Usage
FBP-1210Nylon6Ba ferrite65~7540~48190~2300.6~0.82.4~2.5PCM for TV Monitor
Sr ferrite650~750503~6032400~28900.07~0.1
FBP-1211Nylon6Ba ferrite110~13070~85190~2301.5~3.02.7~3.2Isotropic injection magnet
Nylon12Sr ferrite1100~1300880~10682400~28900.19~0.38
FBP-1212Nylon6Ba ferrite130~15085~105190~2303.0~4.23.2~3.7Isotropic injection magnet
Nylon12Sr ferrite1300~15001070~13202400~28900.38~0.53
FBP-1213Nylon6Ba ferrite210~240120~170160~2307.0~12.03.0~3.5Anisotropic injection magnet
Nylon12Sr ferrite2100~24001510~21402010~28900.88~1.5
FBP-1214Nylon6Ba ferrite250~260164~174210~23011.9~12.53.35~3.55Anisotropic injection magnet
Nylon12Sr ferrite2500~26002060~21902640~28901.5~1.57
FBP-1215Nylon6Sr ferrite250~260174~184230~28012.1~12.73.35~3.55Anisotropic injection magnet
Nylon122500~26002190~23102890~35201.52~1.6
FBP-1216Nylon6Sr ferrite250~260184~194280~32012.3~12.93.35~3.55Anisotropic injection magnet
Nylon122500~26002310~24403520~40001.55~1.62
FBP-1217Nylon6Sr ferrite270~280170~190210~23014.3~14.93.5~3.65Anisotropic injection magnet
Nylon122700~28002140~23902640~28901.8~1.87
FBP-1218Nylon6Sr ferrite270~280180~200230~28014.4~15.03.5~3.65Anisotropic injection magnet
Nylon122700~28002260~23902890~35201.80~1.88
FBP-1219Nylon6Sr ferrite270~280190~200280~32014.5~15.13.5~3.65Anisotropic injection magnet
Nylon122700~28002390~25103520~40001.82~1.89
FBP-1220Nylon6Sr ferrite275~285180~200210~25014.7~15.53.60~3.70Anisotropic injection magnet
Nylon122750~28502260~25102640~31401.85~1.95
FBP-1221Nylon6Sr ferrite285~295190~210210~25015.5~17.03.65~3.75Anisotropic injection magnet
Nylon122850~29502390~26402640~31401.95~2.14
FBP-1222PPSSr ferrite245~265170~180210~25011.0~13.03.48~3.65Anisotropic injection magnet
2450~26502140~22602640~31401.38~1.63
Physical Characteristics of Injection Bonded Ferrite Magnet
NO.Density (g/cm3)Tension Strength (Kg/cm2)Bend Strength (Kg/cm2)Impact Strength (Kg×cm/cm2)Hardness (Rsc)Water Absorption (%)Heat Distortion Temp (°C)
FBP-12102.5~2.7630100025.01020.07110
FBP-12112.7~3.0630110025.01030.07110
FBP-12122.6~2.9630110024.01030.07115
FBP-12133.0~3.5630110023.01040.07113
FBP-12143.1~3.5630120023.01160.07117
FBP-12153.35~3.55630115023.01100.07117
FBP-12163.35~3.55600115021.01120.05118
FBP-12173.5~3.65550120020.01120.05120
FBP-12183.5~3.65550120019.01140.05120
FBP-12193.5~3.65500120017.01150.04125
FBP-12203.60~3.7047090012.01150.04128
FBP-12212.65~3.7545080012.01150.04135
FBP-12223.48~3.654308008.51150.04137