NdFeB magnets are mainly made from Neodymium, Iron, Boron, with excellent magnetic property, abundant raw material and reasonable prices, NdFeB magnets can be used as an ideal magnets in mini-motor, permanent magnet instrument, electronic industry, auto industry, petro-chemical industry, nuclear magnetic resonance, sound device magnetic suspension system,  magnetic transmission machine and magnetic therapy apparatus etc.. The disadvantage of NdFeB magnets is its weak corrosion and oxidation resistance. its surface usually is treated with some special methods. The surface treatment method  include Zinc, Nickel, Tin, Silver, Gold plating and phosphor and spray epoxy resin etc..   Magnetic Properties of Sintered NdFeB   Properties Remanence Coercive force Intrinsic coercive Maximum energy product Working     Br Hcb Force,Hcj (BH)max temp   No Grade KGs T KOe KA/m KOe KA/m MGOe KJ/m3 B/レ0H=-2       Nom. Min. Nom. Min. Nom. Min. Nom. Min. Nom. Min. Nom. Min. ∩   1 N30 11.2 10.8 1.12 1.08 10.5 10 836 796 >12 >955 30 28 239 223 ÷80   2 N35 12 11.7 1.2 1.17 11.5 10.8 915 860 >12 >955 35 33 279 263 ÷80   3 N38 12.6 12.2 1.26 1.22 11.5 11.3 915 900 >12 >955 38 36 303 287 ÷80   4 N40 12.9 12.6 1.29 1.26 11.6 11.4 924 908 >12 >955 40 38 318 303 ÷80   5 N42 13.1 12.9 1.31 1.29 11.8 11.5 939 915 >12 >955 42 40 342 326 ÷80   6 N45 13.6 13.3 1.36 1.33 12 11.6 955 924 >12 >955 45 43 358 342 ÷80   7 N48 14 13.8 1.4 1.38 10.8 10.2 860 810 >11 >875 48 46 383 367 ÷80   8 N50 14.3 14.1 1.43 1.41 10.8 10 860 794 >11 >875 50 48 398 383 ÷80   9 N30M 11.2 10.8 1.12 1.08 10.5 10 836 794 >14 >1114 30 28 239 223 ÷100   10 N35M 12 11.7 1.2 1.17 11.5 10.9 915 868 >14 >1114 35 33 279 263 ÷100   11 N38M 12.6 12.2 1.26 1.22 11.8 11.3 939 900 >14 >1114 38 36 303 287 ÷100   12 N40M 12.9 12.6 1.29 1.26 12 11.6 955 924 >14 >1114 40 38 318 303 ÷100   13 N42M 13.2 12.9 1.32 1.29 12.4 12 987 955 >14 >1114 42 40 342 326 ÷100   14 N45M 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 >14 >1114 45 43 358 342 ÷100   15 N48M 14 13.8 1.4 1.38 13.3 12.9 1059 1027 >14 >1114 48 46 383 367 ÷100   16 N30H 11.2 10.8 1.12 1.08 10.5 10 836 794 >17 >1353 30 28 239 223 ÷120   17 N33H 11.7 11.4 1.17 1.14 11 10.5 876 836 >17 >1353 33 31 263 247 ÷120   18 N35H 12 11.7 1.2 1.17 11.5 10.9 915 868 >17 >1353 35 33 279 263 ÷120   19 N38H 12.6 12.2 1.26 1.22 11.8 11.3 939 900 >17 >1353 38 36 303 287 ÷120   20 N40H 12.8 12.6 1.28 1.26 12 11.6 955 924 >17 >1353 40 38 318 303 ÷120   21 N42H 13 12.8 1.3 1.28 12.4 12 987 955 >17 >1353 42 40 342 326 ÷120   22 N45H 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 >17 >1353 45 43 358 342 ÷120   23 N30SH 11.2 10.8 1.12 1.08 10.5 10.1 836 804 >20 >1595 30 28 239 223 ÷150   24 N33SH 11.7 11.4 1.17 1.14 11 10.6 876 844 >20 >1595 33 31 263 247 ÷150   25 N35SH 12 11.7 1.2 1.17 11.5 11 915 876 >20 >1595 35 33 279 263 ÷150   26 N35SH-ケ 12 11.7 1.2 1.17 11.5 11 915 876 >22 >1751 35 33 279 263 ÷150   27 N37SH 12.3 12 1.23 1.2 11.8 11.3 939 900 >20 >1595 37 35 295 279 ÷150   28 N38SH 12.5 12.2 1.25 1.22 12 11.4 955 908 >20 >1595 38 36 303 287 ÷150   29 N40SH 12.7 12.5 1.27 1.25 12.2 11.8 971 939 >20 >1595 40 38 318 303 ÷150   30 N42SH 13 12.8 1.3 1.28 12.4 12 987 955 >20 >1595 42 40 342 326 ÷150   31 N45SH 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 >20 >1595 45 43 358 342 ÷150   32 N25UH 10 9.6 1 0.96 9.6 9.2 764 732 >25 >1990 25 22 199 175 ÷180   33 N28UH 10.8 10.4 1.08 1.04 10.2 9.8 812 780 >25 >1990 28 26 223 207 ÷180   34 N30UH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 >25 >1990 30 28 239 223 ÷180   35 N33UH 11.5 11.3 1.15 1.13 11 10.6 876 844 >25 >1990 33 31 263 247 ÷180   36 N35UH 11.9 11.7 1.19 1.17 11.5 11 915 876 >25 >1990 35 33 279 263 ÷180   37 N38UH 12.5 12.2 1.25 1.22 12 11.4 955 908 >25 >1990 38 36 303 287 ÷180   38 N40UH 12.7 12.5 1.27 1.25 12.2 11.8 971 939 >25 >1990 40 38 318 303 ÷180   39 N42UH 13 12.8 1.3 1.28 12.4 12 987 955 >25 >1990 42 40 342 326 ÷180   40 N28EH 10.8 10.4 1.08 1.04 10.4 9.8 811 780 >30 >2388 28 26 223 207 ÷200   41 N30EH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 >30 >2388 30 28 239 223 ÷200   42 N33EH 11.5 11.3 1.15 1.13 11 10.6 876 844 >30 >2388 33 31 263 247 ÷200   43 N35EH 11.9 11.7 1.19 1.17 11.5 11 915 876 >30 >2388 35 33 279 263 ÷200   44 N28AH 10.8 10.4 1.08 1.04 10.4 9.8 811 780 >35 >2785 28 26 223 207 ÷220   45 N30AH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 >35 >2785 30 28 239 223 ÷220   46 N33AH 11.5 11.3 1.15 1.13 11 10.6 876 844 >35 >2785 33 31 263 247 ÷220   47 N35AH 11.9 11.7 1.19 1.17 11.5 11 915 876 >35 >2785 35 33 279 263 ÷220       Magnetic Properties of Bonded NdFeB   Material Br bHc iHc (BH)max KurieTemp. Max. WorkingTemp. mT KGs KA/m KOe KA/m KOe KJ/m3 MGOe ìC ìC OM-4 350-450 3.5-4.5 239-279 3.0-3.5 640-796 8-10 24-32 3-4 320 120 OM-6 500-600 5.0-6.0 318-358 4.0-4.5 640-796 8-10 40-56 5-7 390 120 OM-8 550-650 5.5-6.5 358-398 4.5-5.0 955-1115 12-14 60-80 5-8.5 470 150 OM-10 650-700 6.5-7.0 398-439 5.0-5.5 640-796 8-10 72-80 9-10 470 150 OM-12 700-800 7.0-8.0 439-478 5.5-6.0 717-876 9-11 80-96 10-12 470 >=80 OM-L 700-800 7.0-8.0 159-199 2.0-2.5 175-239 2.2-3.0 36-52 4.5-6.5 320 >=80

                AlNiCo describes a family of material, which is derived from a common base composition comprising of aluminum, nickel, cobalt and iron with varying additions of other elements. By varying the composition it is possible to tailor the magnetic properties to meet the needs of a wide variety of end use applications. There are two different manufacturing processes for AlNiCo: Cast AlNiCo can be made into many size and shapes, whereas Sintered AlNiCo is usually restricted to smaller sizes. However, both processes lead themselves to complex geometries and configurations. Standard Sintered AlNiCo has tighter dimensional tolerances due to its processing. It also has slightly lower magnetic properties, but better mechanical strength than Cast AlNiCo products which possess the lowest reversible temperature coefficient magnetism in permanent magnet materials have excellent working temperature up to 600°C. AlNiCo products are widely used in all kinds of meters and other application. Magnetic Properties of Cast Alnico GRADE Br Hcj (BH)max Density U.S.Standard % Change Per C Tc Tw mT Gs KA/m Oe KJ/m3 MGOe g/cm3 Near Br Near Hcj °C °C LN9 680 6800 30 380 9.0 1.13 6.9 AlNiCo 3 -0.03 -0.02 810 450 LN10 600 6000 40 500 10.0 1.2 6.9 -0.03 -0.02 810 450 LN12 720 7200 45 500 12.4 1.55 7.0  AlNiCo 2 -0.03 -0.02 810 450 LN13 700 7000 48 600 12.8 1.60 7.0 -0.03 -0.02 810 450 LN37 1200 12000 48 600 37.0 4.65 7.3  AlNiCo 5 -0.02 +0.02 860 525 LNG40 1250 12500 48 600 40.0 5.00 7.3 -0.02 +0.02 860 525 LNG44 1250 12500 52 650 44.0 5.50 7.3 -0.02 +0.02 860 525 LNG52 1300 13000 56 700 52.0 6.50 7.3 AlNiCo 5DG -0.02 +0.02 86 525 LNG60 1350 13500 59 740 60.0 7.50 7.3 AlNiCo 5-7 -0.02 +0.02 860 525 LNGT28 1000 10000 58 720 28.0 3.50 7.3 AlNiCo 6 -0.025 +0.03 860 525 LNGT36J 700 7000 140 1750 36.0 4.50 7.3 AlNiCo 8HC -0.025 +0.02 860 550 LNGT18 580 5800 100 1250 18.0 2.20 7.3 AlNiCo 8 -0.025 +0.02 86 550 LNGT32 800 8000 100 1250 32.0 4.00 7.3 AlNiCo 8 -0.025 +0.02 860 550 LNGT40 800 8000 110 1380 40.0 5.00 7.3 -0.025 +0.02 860 550 LNG60 900 9000 110 1380 60.0 7.50 7.3 AlNiCo 9 -0.025 +0.02 860 550 LNGT72 1050 10500 112 1400 72.0 9.00 7.3 -0.025 +0.02 860 550     Magnetic Properties of Sintered Alnico GRADE Br Hcj Hcb (BH)max Density % Change Per C Tc REMARKS mT Gs KA/m Oe KA/m Oe KJ/m3 MGOe g/cm3 %/K °C FLN8 520 5200 43 540 40 500 8-10 1.0-1.25 6.8 -0.022 760 ISOTROPIC FLNG12 700 7000 43 540 40 500 12-14 1.5-1.75 7.0 -0.014 810 FLNGT14 570 5700 78 980 76 950 14-16 1.75-2.0 7.1 -0.020 850 FLNGT18 560 5600 90 1130 88 1100 18-22 2.25-2.75 7.2 -0.020 850 FLNG28 1050 10500 47 590 46 580 28-33 3.5-4.15 7.2 -0.016 850 ANISOTROPIC FLNG34 1100 11000 51 640 50 630 34-38 4.3-4.8 7.2 -0.016 890 FLNGT28 1000 10000 57 710 56 700 28-30 3.5-3.8 7.2 -0.020 850 FLNGT31 780 7800 106 1130 104 1300 33-36 3.9-4.5 7.2 -0.020 850 FLNG33J 650 6500 150 1880 136 1700 31-36 4.15-4.5 7.2 -0.020 850 FLNGT38 800 8000 126 1580 123 1550 38-42 4.75-5.3 7.2 -0.020 850 FLNGT42 880 8800 122 1530 120 1500 42-48 5.3-6.0 7.25 -0.020 850

             As part of the rare earth group of permanent magnets, samarium cobalt (SmCo) magnets typically fall into two families of materials. They include rare earth Sm1Co5 and Sm2Co17 and are referred to as 1:5 and 2:17 materials. Samarium cobalt typically offers high energy products with excellent coercive (resistance to demag) forces. This makes samarium an excellent choice for small, compact designs where high temperature environments may be present.               Magnetic Properties of SmCo   Model Br Hcj Hcb (BH)max   mT KGs KA/m3 KOe KA/m3 KOe KJ/m3 MGOe OM16 750-880 7.5-8.8 >1989 >25 597+/-40 7.5+/-0.5 127+/-16 16+/-2 OM18 800-930 8.0-9.3 >1432 >18 637+/-40 8+/-0.5 143+/-16 18+/-2 OM20 850-980 8.5-9.8 >1273 >16 637+/-40 8+/-0.5 159+/-16 20+/-2 OMT18 900-1030 9.0-10.3 >1194 >15 637+/-40 8+/-0.5 143+/-16 18+/-2 OM22A 900-1030 9.0-10.3 >1989 >25 653+/-40 8.2+/-0.5 175+/-16 22+/-2 OM22B 900-1030 9.0-10.3 >1432 >18 635+/-40 8.2+/-0.5 175+/-16 22+/-2 OM24 980-1080 9.8-10.8 >1432 >18 676+/-40 8.5+/-0.5 191+/-16 24+/-2 OM26A 1000-1130 10.0-11.3 >1194 >15 716+/-40 9.0+/-0.5 207+/-16 26+/-2 OM26B 1000-1130 10.0-11.3 >796 >10 716+/-40 9.0+/-0.5 207+/-16 26+/-2 OM28 1030-1130 10.3-11.3 >1432 >18 756+/-40 9.5+/-0.5 223+/-16 28+/-2 OM27 1000-1100 10.0-11.0 413-556 5.2-7.0 357-516 4.5-6.5 183-223 26+/-2 OM30 1100-1200 11.0-12.0 454-597 5.7-7.5 438-517 5.5-6.5 239+/-16 30+/-2