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    Neodymium material specification

    Contents in NdFeb

    Sintered neodymium magnets are composed primarily of neodymium, iron, and boron. The chemical formula Nd2Fe14B represents the basic composition of these magnets. Neodymium is a rare-earth element, while iron and boron are common ferromagnetic materials. This combination results in a powerful magnetic field that surpasses that of other types of magnets.

    More exact composition of a NdFeB magnet is (a few % differ from each batch): Neodymium [Nd]: 35%, Iron [Fe]: 61%, Boron [B]: 1.2%, Dysprosium [Dy]: 0.8%, Copper [Cu]: 0.2%, Aluminium [Al]: 0.9%, Gallium [Ga]: 0.9%.

    Energy product (BHmax)

    Sintered neodymium magnets are most known for their remarkable magnetic properties. They have extremely high magnetic strength, often characterized by their maximum energy product (BHmax), which is a measure of the magnetic energy stored in the material. This is measured in Mega Gauss Oersteds, or MGOe. NdFeB magnets can have BHmax values that are significantly higher than other permanent magnets, making them ideal for applications where strong magnetic fields are required in a compact form.

    To make it simple, the energy product is specified as N35, N38, N40, N42, N45, N48, N50 and N52. Our standard neodymium grade is N36. The higher number, the stronger magnet. As for now the strongest available neodymium grade is N52. See our Neodymium material table below for all different Neodymium grades.

    To compare strength of different materials, see the MGOe specification. For example, ferrite go from approx 3 -5 MGOe and Neodymium go from 31 - 53 MGOe, which means Neodymium is approx 10 times the strength of a ferrite magnet in the same volume.

    Working temperature (Coercivity, HcJ)

    When you look at the magnet table of available materials there are different letters after some of the grades. These letters represent the magnet’s ability to withstand demagnetization forces, which can be temperature or other magnetic forces working against the magnet. We define the coercive force using the most common system, the lettering system. This letter system uses the following letters after the grade to define the magnets specification to fight demagnetization forces: M, H, SH, UH, EH, and AH.

    When a letter is used after a magnet grade, it indicates that that specific material has a greater ability to fight demagnetizing forces. For our purpose, we are going to use heat as the demagnetizing force as it is most common force effecting the magnet. And, the following examples are “general rules” and not “hard and set rules”.

    A Neodymium Magnet with no letter after the grade, i.e. N38, or N45, or N52, would indicate that it has the ability to work in an environment that has a maximum operating temperature no greater than 80C. A magnet with an “M” (i.e. N35M, N42M, etc.) generally means that a magnet can be used in an operating environment up to 100C. An “H” material is good up to 120C, “SH” up to 150C, “UH” up to 180C, “EH” up to 200C, and a “AH” up to 220C. Again, these are general specifications and other factors do play a role in coercivity decisions - like Permeance Coefficient (Pc).

    Permeance Coefficient (Pc)

    The permeance coefficient measures how easily magnetic flux flows through a material. It quantifies the ability of a material to conduct magnetic flux. A higher permeance coefficient means the material allows magnetic flux to pass through more easily, while a lower coefficient indicates less permeability to magnetic flux. In simpler terms, it's like a measure of how friendly a material is to magnetic fields, determining how effectively it can channel or resist other magnetic forces.

    What this means in practice is that a thinner cylinder magnet (lower Pc) will be demagnetized by heat faster than a thicker/taller (higher Pc) cylinder magnet. And depending on the Pc value, the thinner magnet may demagnetize before its rated maximum operating temperature. At the same time, a thicker magnet can exceed the maximum working temperature without being affected.

    Contact us and we will help you choose the right magnet that can handle the right working temperature.

    Surface treatment / coating

    NdFeB-magnets oxidate easily, therefore the magnets are always delivered with a galvanic coating. Our standard range is coated with nickel or zinc. What distinguishes Zn (Zinc) and NiCuNi (Nickel-Copper-Nickel) from eachother is that Zn can have a slighty better adhesion when it comes to gluing and taping. If the magnet is to be in a humid environment, we recommend a nickel-epoxy treatment.

    See our coating page to decide which surface treatment is best for your application!

    Neodymium grade table
    Material
    grade
    Remanence Coercivity Max energy product Working temperature
    Br HcB HcJ (BH)max
    Gauss (kG) Tesla (T) kOe kA/m kOe kA/m kJ/m3 MGOe °C
    N33 11.3 - 1.17 1.13 - 1.17 10.5 ≥836 12 ≥955 247 - 271 31 - 34 ≤80
    N35 11.7 - 12.2 1.17 - 1.22 10.9 ≥868 12 ≥955 263 - 287 33 - 36 ≤80
    N36 12.1 - 12.3 1.21 - 1.23 11.0 ≥875 12 ≥955 280 - 298 35 - 37 ≤80
    N38 12.2 - 12.5 1.22 - 1.25 11.3 ≥899 12 ≥955 287 - 310 36 - 39 ≤80
    N40 12.5 - 12.8 1.25 - 1.28 11.4 ≥907 12 ≥955 302 - 326 38 - 41 ≤80
    N42 12.8 - 13.2 1.28 - 1.32 11.5 ≥915 12 ≥955 318 - 342 40 - 43 ≤80
    N45 13.2 - 13.8 1.32 - 1.38 11.6 ≥920 12 ≥955 342 - 366 43 - 46 ≤80
    N48 13.8 - 14.2 1.38 - 1.42 11.6 ≥923 12 ≥955 366 - 390 46 - 49 ≤80
    N50 14.0 - 14.5 1.40 - 1.45 10.5 ≥796 12 ≥876 382 - 406 48 - 51 ≤80
    N52 14.3 - 14.8 1.43 - 1.48 10.0 ≥796 12 ≥876 398 - 422 50 - 53 ≤80
    N33M 11.3 - 11.7 1.13 - 1.17 10.5 ≥836 14 ≥1114 247 - 271 31 - 34 ≤100
    N35M 11.7 - 12.2 1.17 - 1.22 10.9 ≥836 14 ≥1114 263 - 287 33 - 36 ≤100
    N38M 12.2 - 12.5 1.22 - 1.25 11.3 ≥899 14 ≥1114 287 - 310 36 - 39 ≤100
    N40M 12.5 - 12.8 1.25 - 1.28 11.6 ≥923 14 ≥1114 302 - 326 38 - 41 ≤100
    N42M 12.8 - 13.2 1.28 - 1.32 12.0 ≥955 14 ≥1114 318 - 342 40 - 43 ≤100
    N45M 13.2 - 13.8 1.32 - 1.38 12.5 ≥836 14 ≥1114 342 - 366 42 - 46 ≤100
    N48M 13.6 - 14.3 1.36 - 14.3 12.9 ≥1027 14 ≥1114 366 - 390 46 - 49 ≤100
    N50M 14.0 - 14.5 1.40 - 1.45 13.0 ≥1033 14 ≥1114 382 - 406 48 - 51 ≤100
    N52M 14.2 - 14.8 1.42 - 1.48 13.2 ≥1036 14 ≥1114 398 - 422 50 - 53 ≤100
    N30H 10.8 - 11.3 1.08 - 1.13 10.0 ≥796 17 ≥1353 223 - 247 28 - 31 ≤120
    N33H 11.3 - 11.7 1.13 - 1.17 10.5 ≥836 17 ≥1353 247 - 271 31 - 34 ≤120
    N35H 11.7 - 12.2 1.17 - 1.22 10.9 ≥868 17 ≥1353 263 - 287 33 - 36 ≤120
    N36H 12.1 - 12.3 1.21 - 1.23 11.0 ≥875 17 ≥1353 280 - 298 35 - 37 ≤120
    N38H 12.2 - 12.5 1.22 - 1.25 11.3 ≥899 17 ≥1353 287 - 310 36 - 39 ≤120
    N40H 12.5 - 12.8 1.25 - 1.28 11.6 ≥923 17 ≥1353 302 - 326 38 - 41 ≤120
    N42H 12.8 - 13.2 1.28 - 1.32 12.0 ≥955 17 ≥1353 318 - 342 40 - 43 ≤120
    N45H 13.2 - 13.7 1.32 - 1.37 12.2 ≥963 17 ≥1353 342 - 368 43 - 46 ≤120
    N48H 13.6 - 14.3 1.36 - 1.43 12.5 ≥995 17 ≥1353 366 - 390 46 - 49 ≤120
    N50H 14.0 - 14.5 1.40 - 1.45 12.6 ≥1000 17 ≥1270 382 - 406 48 - 51 ≤120
    N30SH 10.8 - 11.2 1.08 - 1.12 10.1 ≥804 20 ≥1592 223 - 243 28 - 32 ≤150
    N33SH 11.3 - 11.7 1.13 - 1.17 10.6 ≥844 20 ≥1592 247 - 271 31 - 34 ≤150
    N35SH 11.7 - 12.2 1.17 - 1.22 11.0 ≥876 20 ≥1592 263 - 287 33 - 36 ≤150
    N36SH 12.1 - 12.3 1.21 - 1.23 11.3 ≥900 20 ≥1592 280 - 298 35 - 37 ≤150
    N38SH 12.2 - 12.5 1.22 - 1.25 11.4 ≥907 20 ≥1592 287 - 310 36 - 39 ≤150
    N40SH 12.5 - 12.8 1.25 - 1.28 11.8 ≥939 20 ≥1592 302 - 326 38 - 41 ≤150
    N42SH 12.8 - 13.2 1.28 - 1.32 12.4 ≥987 20 ≥1592 318 - 342 40 - 43 ≤150
    N45SH 13.2 - 13.8 1.32 - 1.38 12.6 ≥1003 20 ≥1592 342 - 366 43- 46 ≤150
    N48SH 13.6 - 14.2 1.36 - 1.42 12.8 ≥1018 20 ≥1592 366 - 390 46 - 49 ≤150
    N30UH 10.8 - 11.3 1.08 - 1.13 10.2 ≥812 25 ≥1990 223 - 247 28 - 31 ≤180
    N33UH 11.3 - 11.8 1.13 - 1.18 10.5 ≥836 25 ≥1990 247 - 271 31 - 34 ≤180
    N35UH 11.7 - 12.2 1.17 - 1.22 10.8 860 25 ≥1990 263 - 287 33 - 36 ≤180
    N38UH 12.2 - 12.5 1.22 - 1.25 11.0 876 25 ≥1990 287 - 310 36 - 39 ≤180
    N40UH 12.5 - 12.8 1.25 - 1.28 11.5 899 25 ≥1990 302 - 326 38 - 41 ≤180
    N42UH 12.8 - 13.2 1.28 - 1.32 11.8 ≥940 25 ≥1990 318 - 342 40 - 43 ≤180
    N28EH 10.2 - 10.8 1.02 - 1.08 9.8 ≥780 30 ≥2388 207 - 231 26 -29 ≤200
    N30EH 10.8 - 11.3 1.08 - 1.13 10.2 ≥812 30 ≥2388 223 - 247 28 - 31 ≤200
    N33EH 11.3 - 11.7 1.13 - 1.17 10.5 ≥836 30 ≥2388 247 - 271 31 - 34 ≤200
    N35EH 11.7 - 12.2 1.17 - 1.12 10.8 ≥864 30 ≥2388 263 - 287 33 - 36 ≤200
    N36EH 12.1 - 12.3 1.21 - 1.23 11.0 ≥875 30 ≥2388 280 - 298 35 - 37 ≤200
    N36EH 12.1 - 12.3 1.21 - 1.23 11.0 ≥875 30 ≥2388 280 - 298 35 - 37 ≤200
    N36EH 12.1 - 12.3 1.21 - 1.23 11.0 ≥875 30 ≥2388 280 - 298 35 - 37 ≤200
    N38EH 12.2 - 12.5 1.22 - 1.25 11.3 ≥899 30 ≥2388 287 - 310 36 - 39 ≤200
    N40EH 12.5 - 12.8 1.25 - 1.28 11.5 ≥915 30 ≥2388 247 - 271 38 - 41 ≤200
    N30AH 10.8 - 11.3 1.08 - 1.13 10.5 ≥819 35 ≥2785 263 - 287 28 - 31 ≤230
    N33AH 11.3 - 11.7 1.13 - 1.17 10.8 ≥843 35 ≥2785 287 - 310 31 - 34 ≤230
    N35AH 11.7 - 12.2 1.17 - 1.22 11.0 ≥876 35 ≥2785 263 - 287 33 - 36 ≤230
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