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
Grade Value (min/typical in our factory)
Br Hcb(BHC) Hcj(IHC) (BH)max
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
Grade Br HCB HCJ (BH)max
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
Grade Br HCB HCJ (BH)max
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
Grade Composition Br HCB HCJ (BH)max
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

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