Sintered Ferrite Magnets
Sintered hard ferrite magnets are manufactured by a die pressing followed by sintering process which allows economic production of components in a varied array of sizes and shapes. Ferrite magnets have excellent corrosion resistance and have normal operating capabilities between -40 °C and +250 °C.
When considering a new design using hard ferrite magnets, in order to minimize the potential for manufacturing difficulties and to be more assured of a satisfactory, and perhaps less costly product, one should bear in mind a few rules: 1,) The maximum thickness in the direction of pressing should be approximately one inch, and this dimension (also called the magnetic length) should be less than any other dimension. If greater thickness is needed for a particular application, two or more magnets may be stacked and cemented together. 2,) Whenever possible, magnetic circuits should be designed to accommodate unground dimensional tolerances (except for the thickness, which is normally ground to ±005 inch. Additional grinding is usually a significant portion of the total cost. 3,) Slots, steps, or any abrupt change in cross section should be avoided. The arc ends of motor segments should preferably be flat at the outside corner.
Manufactured from oxide materials using powder metallurgical process. Ferrite magnet is most widely used because of its low cost, high-energy, good electric insulation and excellent resistance to demagnetization. The most common type of ferrite magnets are anisotropic strontium, anisotropic barium and isotropic barium magnet.
Our huge range of ferrite magnets can ensure us to supply assortment of goods to choose from, which includes arc segments, ring types discs, blocks, bars and more, in a variety of sizes and shapes. This selection includes all grades, oriented and non-oriented, bi-pole and multi-pole magnets.
Mostly Used national standard - SJ285-77 permanent ferrite magnet standard |
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Grade | Value (min/typical in our factory) |
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| Br | Hcb(BHC) | Hcj(IHC) | (BH)max |
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| 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 | 26.0/28.0 | 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 standard -sj/T10410 2000 permanent ferrite magnet standard |
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Grade | Br | HCB | HCJ | (BH)max |
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| mT | KG | KA/m | Oe | KA/m | Oe | Kj/m3 | MGOe |
Y8T | 200~235 | 2.0~2.35 | 125~160 | ≥1.57 | 210~280 | ≥2.610 | 6.5~9.5 | ≥0.8 |
Y22H | 310~360 | 3.1~3.6 | 220~250 | ≥2.77 | 280~320 | ≥3520 | 20.0~24.0 | ≥2.5 |
Y25 | 360~400 | 3.6~4.0 | 135~170 | ≥1.70 | 140~200 | ≥1760 | 22.5~28.0 | ≥2.8 |
Y26H-1 | 360~390 | 3.6~3.9 | 220~250 | ≥2.512 | 225~255 | ≥2830 | 23.0~28.0 | ≥2.9 |
Y26H-2 | 360~380 | 3.6~3.8 | 263~288 | ≥3.30 | 318~350 | ≥4000 | 24.0~28.0 | ≥3.0 |
Y27H | 370~400 | 3.7~4.0 | 225~240 | ≥2.83 | 235~260 | ≥2950 | 25.0~29.0 | ≥3.1 |
Y28 | 370~400 | 3.7~4.0 | 175~210 | ≥2.20 | 180~220 | ≥2260 | 26.0~30.0 | ≥3.3 |
Y28H-1 | 380~400 | 3.8~4.0 | 240~260 | ≥3.02 | 250~280 | ≥3140 | 27.0~30.0 | ≥3.1 |
Y28H-2 | 360~380 | 3.6~3.8 | 271~295 | ≥3.40 | 382~405 | ≥1800 | 26.0~30.0 | ≥3.3 |
Y30 | 370~400 | 3.7~4.0 | 175~210 | 2.20~2.64 | 180~220 | 2.26~2.77 | 26.0~30.0 | 3.3~3.8 |
Y30H-1 | 380~400 | 3.8~4.0 | 230~275 | ≥2.89 | 235~290 | ≥2950 | 27.0~32.5 | ≥3.4 |
Y30H-2 | 395~415 | 3.95~4.15 | 275~300 | ≥3.46 | 310~335 | ≥3900 | 27.0~32.0 | ≥3.4 |
Y32 | 400~420 | 4.0~4.2 | 160~190 | ≥2.01 | 165~195 | ≥2070 | 30.0~33.5 | ≥3.8 |
Y32H-1 | 400~420 | 4.0~4.2 | 190~230 | ≥2.39 | 230~250 | ≥2890 | 34.5~35.0 | ≥4.0 |
Y32H-2 | 400~440 | 4.0~4.4 | 224~240 | ≥2.81 | 230~250 | ≥2890 | 31.0~34.0 | ≥3.9 |
Y33 | 410~430 | 4.1~4.3 | 220~250 | ≥2.76 | 225~255 | ≥2830 | 31.5~35.0 | ≥4.0 |
Y33H | 410~430 | 4.1~4.3 | 250~270 | ≥3.14 | 250~275 | ≥3140 | 31.5~35.0 | ≥4.0 |
Y34 | 420~440 | 4.2~4.4 | 200~230 | ≥2.51 | 205~235 | ≥2580 | 32.5~36.0 | ≥4.1 |
Y35 | 430~450 | 4.3~4.5 | 215~239 | ≥2.70 | 217~242 | ≥2730 | 33.1~33.2 | ≥4.2 |
Y36 | 440~450 | 4.4~4.5 | 247~271 | ≥3.10 | 250~374 | ≥4400 | 35.1~38.3 | ≥4.4 |
Y38 | 440~460 | 4.4~4.6 | 285~305 | ≥3.58 | 294~310 | ≥3690 | 36.6~40.6 | ≥4.6 |
Y40 | 450~460 | 4.5~4.6 | 330~354 | ≥4.15 | 340~360 | ≥4270 | 37.6~41.8 | ≥4.7 |
Demagetization Curves of Permanent Ferrite Magnet
USA standard - permanent ferrite magnet industry standard of USA |
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Grade | Br | HCB | HCJ | (BH)max |
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| mT | KG | KA/m | KOe | KA/e | KOe | kj/m3 | MGOe |
C1 | 230 | 2.3 | 148 | 1.86 | 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 |
C8(=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 |
Japan TDK standard |
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Grade | Composition | Br | HCB | HCJ | (BH)max |
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| mT | kG | kA/m | kOe | kA/m | kOe | KJ/m3 | MGOe |
FB40 | SrO6Fe2O3 | 410±10 | 4.1±0.1 | 234.8±11.9 | 2.95±0.15 | 238.7±15.9 | 3±0.2 | 31.4±1.6 | 3.95±0.2 |
FB3N | SrO6Fe2O3 | 395±15 | 3.95±0.15 | 234.8±11.9 | 2.95±0.15 | 238.7±15.9 | 3±0.2 | 28.7±2.4 | 3.6±0.3 |
FB3G | SrO6Fe2O3 | 375±15 | 3.75±0.15 | 254.6±15.9 | 3.2±0.2 | 270.6±19.9 | 3.4±0.25 | 25.9±2.4 | 3.25±0.3 |
FB3X | SrO6Fe2O3 | 375±15 | 3.75±0.15 | 234.8±11.9 | 2.95±0.15 | 238.7±15.9 | 3±0.2 | 25.9±2.4 | 3.25±0.3 |
FB1A | SrO6Fe2O3 | 220±15 | 2.2±0.15 | 159.2±15.9 | 2±0.2 | 258.6±19.9 | 3.25±0.25 | 8.9±1.6 | 1.1±0.2 |
FB5H | SrO6Fe2O3 | 405±15 | 4.05±0.15 | 298.4±11.9 | 3.75±0.15 | 322.3±11.9 | 4.05±0.15 | 31.1±1.6 | 3.9±0.2 |
FB4X | SrO6Fe2O3 | 420±10 | 4.2±0.1 | 234.8±11.9 | 2.95±0.15 | 238.7±15.9 | 3±0.2 | 33.4±1.6 | 4.2±0.2 |
FB4B | SrO6Fe2O3 | 400±10 | 4±0.1 | 254.6±11.9 | 3.2±0.2 | 262.6±19.9 | 3.3±0.25 | 30.3±1.6 | 3.8±0.2 |
FB4A | Sr/BaO6Fe2O3 | 410±10 | 4.1±0.1 | 175.1±15.9 | 2.2±0.2 | 176.7±15.9 | 2.22±0.2 | 31.8±1.6 | 4.0±0.2 |
FBGN | SrO6Fe2O3 | 440±10 | 4.4±0.1 | 258.6±11.9 | 3.25±0.15 | 262.6±11.9 | 3.3±0.15 | 36.7±1.6 | 4.6±0.2 |
FB6B | SrO6Fe2O3 | 420±10 | 4.2±0.1 | 302.4±11.9 | 3.8±0.15 | 318.3±11.9 | 4.0±0.15 | 33.4±1.6 | 4.2±0.2 |
FB6H | SrO6Fe2O3 | 400±10 | 4±0.1 | 302.4±11.9 | 3.8±0.15 | 358.1±11.9 | 4.5±0.15 | 30.3±1.6 | 3.8±0.2 |
FB6E | SrO6Fe2O3 | 380±10 | 3.8±0.1 | 290.5±11.9 | 3.65±0.15 | 393.9±11.9 | 4.95±0.15 | 27.5±1.6 | 3.45±0.2 |
FB5N | SrO6Fe2O3 | 440±10 | 4.4±0.1 | 256.8±11.9 | 2.85±0.15 | 259.2±11.9 | 2.88±0.15 | 36.7±1.6 | 4.6±0.2 |
FB5B | SrO6Fe2O3 | 420±10 | 4.2±0.1 | 262.6±11.9 | 3.3±0.15 | 266.6±11.9 | 3.35±0.15 | 33.4±1.6 | 4.2±0.2 |
