HARD FERRITE MAGNETSHard ferrite (ceramic) magnets were developed in the 1960s as a low cost alternative to metallic magnets. Even though they exhibit low energy (compared with other permanent magnet materials) and are relatively brittle and hard, ferrite magnets have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. In fact, measured by weight, ferrite represents more than 75 percent of the world magnet consumption. It is the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensors.Ferrite Magnets characteristicsMostly Used national standard - SJ285-77 permanent ferrite magnet standard Value(min/typical in our factory) Br Hcb(BHC) Hcj(IHC) (BH)max Grade MT KG KA/m Koe KA/m KOe Kj/m3 MGOe Y10T(=C1) 200/218 2.00/2.18 125/145 1.57/1.82 210/250 2.64/3.14 6.5/8.0 0.8/1.0 Y25 360/370 3.60/3.70 135/150 1.70/1.88 140/170 1.76/2.14 22.5/25.3 2.8/3.2 Y30(=C5) 380/385 3.80/3.85 191/210 2.40/2.64 199/220 2.50/2.51 26.0/28 3.4/3.7 Y30BH 380/390 3.80/3.90 223/235 2.80/2.95 231/245 2.90/3.08 27.0/30.0 3.4/3.7 Y33 410/420 4.10/4.20 220/235 2.77/2.95 225/240 2.83/3.01 31.5/33.0 4.0/4.2 Y35 400/410 4.00/4.10 175/195 2.20/2.45 180/200 2.26/2.51 30.0/32.0 3.8/4.0 C8(=C8A) 385/390 3.85/3.90 235/255 2.95/3.20 242/265 3.05/3.33 27.8/30.0 3.5/3.7 C10 400/410 4.00/4.10 288/300 3.62/3.77 280/287 3.51/3.60 30.4/31.9 3.8/4.0 Chinese SJ/T0410-2000 Permanent Ferrite Manget Standard BR HcB HcJ (BH)max Grade mT KG KA/m Koe KA/m Koe Kj/m MGOe Y8T 200235 2.02.35 125160 1.572.01 210280 2.643.52 6.59.5 0.81.2 Y20 320380 3.23.8 135190 1.702.38 140195 1.762.45 18.022.0 2.32.8 Y22H 310360 3.13.6 220250 2.773.14 280320 3.524.02 20.024.0 2.53.0 Y23 320370 3.23.7 170190 2.142.38 190230 2.392.89 20.025.5 2.53.2 Y25 360400 3.64.0 135170 1.702.14 140200 1.762.51 22.528.0 2.83.5 Y26H 360390 3.63.9 220250 2.773.14 225255 2.833.21 23.028.0 2.93.5 Y27H 370400 3.74.0 205250 2.583.14 210255 2.643.21 25.029.0 3.13.7 Y28 370400 3.74.0 1752102 2.202.64 180220 2.262.77 26.030.0 3.33.8 Y30H-1 380400 3.84.0 230275 2.893.46 235290 2.953.65 27.032.0 3.44.1 Y30H-2 395415 3.954.15 275300 3.463.77 310335 3.904.21 28.532.5 3.54.0 Y32 400420 4.04.2 160190 2.012.38 165195 2.072.45 30.033.5 3.84.2 Y33 410430 4.14.3 220250 2.773.14 225255 2.833.21 31.535.0 4.04.4 Y35 430450 4.34.5 215239 2.703.00 217241 2.733.03 33.133.2 4.164.17 In MMPA（0100-87) standard BR HcB HcJ (BH)max Grade mT KG KA/m Koe KA/m Koe Kj/m MGOe C1 230 2.3 148 1.84 258 3.5 8.36 1.05 C5 380 3.8 191 2.4 199 2.5 27 3.4 C7 340 3.4 258 3.23 318 4.00 21.9 2.75 C8A 385 3.85 235 2.95 242 3.05 27.8 3.5 C8B 420 4.2 232 2.913 236 2.96 32.8 4.12 C9 380 3.8 280 3.516 320 4.01 26.4 3.32 C10 400 4.0 288 3.617 280 3.51 30.4 3.82 C11 430 4.3 200 2.512 204 2.56 34.4 4.32 Ring shape size(mm) DdH 6033320 10251523 16986529 6040320 10257523 18156529 6043320 10260523 18157529 6124315 10275523 18173529 6132315 10945528 18183.5529 6342320 10960528 18186/90529 6524321 11038521 18195529 6525321 11043521 19380529 6532321 11045521 19383.5529 6832315 1105521（with12.72hole） 6840315 7532323 7540323 3012.5320 11051521 19386/89527 6842315 11057521 193110527 7016317 11060521 193122527 7020317 11051521 19386/89527 6842315 11057521 193110527 7016317 11060521 193122527 7020317 11543523 20083527 7030.5317 11545523 20086527 7032317 11543523 20083527 7030.5317 11545523 20086527 7032317 11557523 20095527 7056317 11558.7323（elliptical） 200100527 7040317 11560523 200110527 7140317 11567523 200120527 7130.5317 11580523 20688.9530 7132317 12145524 20689530 7230.5316 12157524 206118530 7232316 12160524 21086530 7238316 12165524 210118530 7240316 NdFeB Known as third generation of Rare Earth magnets, Neodymium Iron Boron (NdFeB) magnets are the most powerful and advanced commercialized permanent magnet today. Since they are made from Neodymium, one of the most plentiful rare earth elements, and inexpensive iron, NdFeB magnets offer the best value in cost and performance.NdFeB magnets are available in both sintered and bonded forms. Sintered NdFeB offers the highest magnetic properties (28 MGOe to 50 MGOe) while Bonded NdFeB offers lower energy properties. Although bonded magnets do not possess magnetic properties as advanced as those of sintered magnets, they can be made in shapes and sizes that are difficult to achieve with sintering.A variety of coatings can be applied to the magnets surface to overcome the principle drawback of neodymium-based magnets, the