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
2.Magnetic Properties of Sintered NdFeB Magnets:
3. Typical Physical Properties:
Bonded Neodymium Magnet Grades:

performance parameter of bonded ndfeb magnet
Magnetic Characteristic and Physical Properties Of Bonded Neodymium Magnet:
COMPRESSION MOLDED BONDED NEODYMIUM GRADES
Grade |
Residual Induction |
Coercive Force |
Intrinsic Coercive Force |
Maximum Energy Product |
Density D |
Reversible Permeability |
Reversible Temp Coefficient A |
Max Operating Temp |
BNP-2 |
300-400 |
160-240 |
440-600 (5.5-7.5) |
19-26 |
5.6-6.0 |
1.20 |
-0.11 |
160 |
BNP-3 |
400-510 |
216-280 |
504-680 |
24-32 |
5.6-6.0 |
1.20 |
-0.11 |
160 |
BNP-4 |
460-520 |
224-288 |
504-680 |
30-35 |
5.6-6.0 |
1.20 |
-0.11 |
160 |
BNP-5 |
470-550 |
240-360 |
520-680 |
37-44 |
5.6-6.0 |
1.20 |
-0.11 |
160 |
BNP-6 |
650-700 |
456-512 |
600-720 |
80-96 |
5.6-6.0 |
1.20 |
-0.11 |
160 |
BNP-7 |
550-650 |
320-408 |
560-680 |
52-64 |
5.6-6.0 |
1.20 |
-0.11 |
160 |
BNP-8 |
620-670 |
400-456 |
640-800 |
64-76 |
5.8-6.2 |
1.20 |
-0.11 |
160 |
BNP-8A |
620-680 |
400-480 |
1040-1280 |
65-73 |
5.8-6.1 |
1.20 |
-0.10 |
180 |
BNP-9L |
650-700 |
360-416 |
520-640 |
68-75 |
5.8-6.1 |
1.20 |
-0.11 |
120 |
BNP-9 |
650-700 |
416-456 |
680-800 |
68-76 |
5.8-6.2 |
1.20 |
-0.12 |
160 |
BNP-9H |
650-700 |
432-488 |
920-1040 |
71-80 |
5.8-6.1 |
1.20 |
-0.10 |
180 |
BNP-10H |
650-710 |
432-480 |
764-960 |
74-82 |
5.8-6.1 |
1.20 |
-0.10 |
180 |
BNP-10 |
670-720 |
424-480 |
640-800 |
76-84 |
5.8-6.2 |
1.20 |
-0.10 |
160 |
BNP-11 |
680-740 |
400-480 |
640-800 |
80-88 |
6.0-6.2 |
1.20 |
-0.10 |
180 |
BNP-12D |
720-770 |
440-520 |
720-880 |
88-96 |
6.1-6.3 |
1.20 |
-0.10 |
160 |
BNP-12L |
730-770 |
368-432 |
520-640 |
80-88 |
6.0-6.3 |
1.20 |
-0.12 |
120 |
BNP-13L |
780-830 |
400-80 |
480-640 |
88-104 |
6.1-6.4 |
1.20 |
-0.12 |
120 |
INJECTION MOLDED BONDED NEODYMIUM GRADES
Grade |
Residual Induction |
Coercive Force |
Intrinsic Coercive Force |
Maximum Energy Product |
Density D |
Reversible Permeability |
Reversible Temp Coefficient A |
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

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
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 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Grade | Residual Induction Br |
Coercive Force Hc |
Intrinsic Coercive Force Hci |
Maximum Energy Product (BH)max |
Max. Operating Temp.* |
|||||
Nominal | Nominal | Minimum | Nominal | Nominal | ||||||
k-Gauss | Tesla | Oersted | kA/m | Oersted | kA/m | MGOe | kJ/m3 | °C | °F | |
Alnico 2 | 7.0 | 0.7 | 500 | 40 | 540 | 43 | 1.5 | 12 | 450°C | 840°F |
Alnico 5 | 11.0 | 1.1 | 600 | 48 | 600 | 48 | 4.25 | 34 | 450°C | 840°F |
Alnico 8 | 8.8 | 0.88 | 1,530 | 121 | 1.600 | 127 | 5.25 | 42 | 450°C | 840°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 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Grade | Residual Induction Br |
Coercive Force Hc |
Intrinsic Coercive Force Hci |
Maximum Energy Product (BH)max |
Max. Operating Temp.* |
|||||
Nominal | Nominal | Minimum | Nominal | Nominal | ||||||
k-Gauss | Tesla | k-Oersted | kA/m | k-Oersted | kA/m | MGOe | kJ/m3 | °C | °F | |
Alnico 5 | 12.2 | 1.22 | 600 | 48 | 630 | 50 | 5.0 | 40 | 500°C | 930°F |
Alnico 5B | 12.2 | 1.22 | 650 | 52 | 660 | 53 | 5.5 | 44 | 500°C | 930°F |
Alnico 5 DG | 12.5 | 1.25 | 690 | 55 | 700 | 56 | 6.5 | 52 | 500°C | 930°F |
Alnico 5-7 | 13.0 | 1.3 | 700 | 56 | 740 | 59 | 7.5 | 60 | 525°C | 980°F |
Alnico 8-HC | 7.0 | 0.7 | 1,750 | 139 | 1,750 | 139 | 4.5 | 36 | 525°C | 980°F |
Alnico 8 | 8.2 | 0.82 | 1,500 | 119 | 1,600 | 127 | 5.0 | 40 | 525°C | 980°F |
Alnico 8B | 8.8 | 0.88 | 1,500 | 119 | 1,650 | 131 | 5.5 | 44 | 525°C | 980°F |
Alnico 8C | 9.0 | 0.9 | 1,380 | 110 | 1,440 | 115 | 7.5 | 60 | 525°C | 980°F |
Alnico 9 | 10.5 | 1.05 | 1,410 | 112 | 1,440 | 139 | 9.0 | 72 | 525°C | 980°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 | |||
---|---|---|---|
Property | Units | Value Sintered Alnico | Value Cast Alnico |
Vickers Hardness | Hv | 440 | 440-620 |
Density | g/cm3 | 6.8 – 7.0 | 6.9 – 7.3 |
Curie Temp TC | °C | 810 – 860 | 740 – 860 |
Curie Temp TF | °F | 1,400 – 1,580 | 1,460 – 1,580 |
Specific Resistance | μΩ⋅Cm | 50- 70 | 45 – 75 |
Bending Strength | kN/mm2 | 0.35 – 0.76 | 0.05 – 0.31 |
Tensile Strength | kN/mm2 | 0.35- 0.45 | 0.02 – 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) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Ceramic Magnets – Physical Properties | ||
---|---|---|
Property | Units | Value Ceramic (Strontium Ferrite) |
Vickers Hardness | Hv | ~ 1160 (7 Mohs) |
Density | g/cm3 | 4.5 to 5.1 |
Curie Temp TC | °C | 450 to 460 |
Curie Temp TF | °F | 840 to 860 |
*Specific Resistance | μΩ⋅Cm | > 106 |
Bending Strength | kN/mm2 | 0.05 – 0.09 |
Tensile Strength | kN/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:
TYPE NO. | Binder | Magnet Material | Br (mT) Gs |
HCB (kA/m) Oe |
HCJ (kA/m) Oe |
(BH)max kJ/m3 MGOe |
Density (g/cm3) |
Usage |
FBP-1210 | Nylon6 | Ba ferrite | 65~75 | 40~48 | 190~230 | 0.6~0.8 | 2.4~2.5 | PCM for TV Monitor |
Sr ferrite | 650~750 | 503~603 | 2400~2890 | 0.07~0.1 | ||||
FBP-1211 | Nylon6 | Ba ferrite | 110~130 | 70~85 | 190~230 | 1.5~3.0 | 2.7~3.2 | Isotropic injection magnet |
Nylon12 | Sr ferrite | 1100~1300 | 880~1068 | 2400~2890 | 0.19~0.38 | |||
FBP-1212 | Nylon6 | Ba ferrite | 130~150 | 85~105 | 190~230 | 3.0~4.2 | 3.2~3.7 | Isotropic injection magnet |
Nylon12 | Sr ferrite | 1300~1500 | 1070~1320 | 2400~2890 | 0.38~0.53 | |||
FBP-1213 | Nylon6 | Ba ferrite | 210~240 | 120~170 | 160~230 | 7.0~12.0 | 3.0~3.5 | Anisotropic injection magnet |
Nylon12 | Sr ferrite | 2100~2400 | 1510~2140 | 2010~2890 | 0.88~1.5 | |||
FBP-1214 | Nylon6 | Ba ferrite | 250~260 | 164~174 | 210~230 | 11.9~12.5 | 3.35~3.55 | Anisotropic injection magnet |
Nylon12 | Sr ferrite | 2500~2600 | 2060~2190 | 2640~2890 | 1.5~1.57 | |||
FBP-1215 | Nylon6 | Sr ferrite | 250~260 | 174~184 | 230~280 | 12.1~12.7 | 3.35~3.55 | Anisotropic injection magnet |
Nylon12 | 2500~2600 | 2190~2310 | 2890~3520 | 1.52~1.6 | ||||
FBP-1216 | Nylon6 | Sr ferrite | 250~260 | 184~194 | 280~320 | 12.3~12.9 | 3.35~3.55 | Anisotropic injection magnet |
Nylon12 | 2500~2600 | 2310~2440 | 3520~4000 | 1.55~1.62 | ||||
FBP-1217 | Nylon6 | Sr ferrite | 270~280 | 170~190 | 210~230 | 14.3~14.9 | 3.5~3.65 | Anisotropic injection magnet |
Nylon12 | 2700~2800 | 2140~2390 | 2640~2890 | 1.8~1.87 | ||||
FBP-1218 | Nylon6 | Sr ferrite | 270~280 | 180~200 | 230~280 | 14.4~15.0 | 3.5~3.65 | Anisotropic injection magnet |
Nylon12 | 2700~2800 | 2260~2390 | 2890~3520 | 1.80~1.88 | ||||
FBP-1219 | Nylon6 | Sr ferrite | 270~280 | 190~200 | 280~320 | 14.5~15.1 | 3.5~3.65 | Anisotropic injection magnet |
Nylon12 | 2700~2800 | 2390~2510 | 3520~4000 | 1.82~1.89 | ||||
FBP-1220 | Nylon6 | Sr ferrite | 275~285 | 180~200 | 210~250 | 14.7~15.5 | 3.60~3.70 | Anisotropic injection magnet |
Nylon12 | 2750~2850 | 2260~2510 | 2640~3140 | 1.85~1.95 | ||||
FBP-1221 | Nylon6 | Sr ferrite | 285~295 | 190~210 | 210~250 | 15.5~17.0 | 3.65~3.75 | Anisotropic injection magnet |
Nylon12 | 2850~2950 | 2390~2640 | 2640~3140 | 1.95~2.14 | ||||
FBP-1222 | PPS | Sr ferrite | 245~265 | 170~180 | 210~250 | 11.0~13.0 | 3.48~3.65 | Anisotropic injection magnet |
2450~2650 | 2140~2260 | 2640~3140 | 1.38~1.63 |
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-1210 | 2.5~2.7 | 630 | 1000 | 25.0 | 102 | 0.07 | 110 |
FBP-1211 | 2.7~3.0 | 630 | 1100 | 25.0 | 103 | 0.07 | 110 |
FBP-1212 | 2.6~2.9 | 630 | 1100 | 24.0 | 103 | 0.07 | 115 |
FBP-1213 | 3.0~3.5 | 630 | 1100 | 23.0 | 104 | 0.07 | 113 |
FBP-1214 | 3.1~3.5 | 630 | 1200 | 23.0 | 116 | 0.07 | 117 |
FBP-1215 | 3.35~3.55 | 630 | 1150 | 23.0 | 110 | 0.07 | 117 |
FBP-1216 | 3.35~3.55 | 600 | 1150 | 21.0 | 112 | 0.05 | 118 |
FBP-1217 | 3.5~3.65 | 550 | 1200 | 20.0 | 112 | 0.05 | 120 |
FBP-1218 | 3.5~3.65 | 550 | 1200 | 19.0 | 114 | 0.05 | 120 |
FBP-1219 | 3.5~3.65 | 500 | 1200 | 17.0 | 115 | 0.04 | 125 |
FBP-1220 | 3.60~3.70 | 470 | 900 | 12.0 | 115 | 0.04 | 128 |
FBP-1221 | 2.65~3.75 | 450 | 800 | 12.0 | 115 | 0.04 | 135 |
FBP-1222 | 3.48~3.65 | 430 | 800 | 8.5 | 115 | 0.04 | 137 |