Ferrite magnet
Ferrite magnet
Ferrite Magnets: The Economical Workhorse of Magnetic Solutions
What are Ferrite Magnets?
Ferrite magnets (Ceramic Magnets), composed of iron oxide (Fe₂O₃) and strontium/cobalt carbonate, are the most widely used permanent magnets globally, with annual production exceeding 1.2 million tons. Key characteristics:
1. Operating temperature: -40°C to +250°C
2. Intrinsic coercivity: 1,800-3,800 Oe
3. Resistivity: 10^4 Ω·cm
Four Reasons Global OEMs Choose Our Ferrite Magnets：
1. Unbeatable Cost Efficiency
Unit price is about 1/8 - 1/5 of NdFeB
2. High-Temperature Reliability
Stable performance up to 250°C (Superior to NdFeB)
<2% flux loss at 150°C/1000h
3. Custom Geometry Solutions
20+ standard shapes: Arc segments, trapezoids, multi-pole rings
Precision grinding to ±0.1mm
4. Corrosion Resistance
No coating required (Natural antioxidant)
Salt spray test 500h (ASTM B117)
Ferrite vs. Rare Earth Magnets: Cost-Benefit Analysis
Parameter | Ferrite | NdFeB | SmCo |
Cost per BHmax | $1 | $8 | $15 |
Temp Coefficient | -0.2%/°C | -0.12%/°C | -0.04%/°C |
Best Application | High-Volume Consumer Products | Precision Motors | Extreme Environments |
Dominating 80%+ Magnet Applications Across Industries
Automotive Systems
ABS wheel speed sensors (20-30 pcs per vehicle)
DC fuel pump motors
Audio Equipment
Loudspeaker magnets (Hi-Fi to PA system full coverage)
Microphone assemblies
Industrial Automation
Magnetic separators for mining
Holding magnets for CNC jigs
FAQ Section:
Q: Are ferrite magnets good for outdoor use?
A: Absolutely! Our Y30BH grade withstands 85% humidity & UV exposure for 10+ years.
Physical property of sintered hard ferrite
Parameters | Mark | Unit | Value | Note |
Relative Recoil Permeability | μrec | μrec | 1.05~1.3 | |
Curie temperature | Tc | °C | 460 | |
The coefficient of Br to temperature | αBr | °C-1 | -0.20% | 0~100°C |
The coefficient of Hcj to temperature | αHCJ | °C-1 | 0.2%~0.5% | 0~100°C |
Density | D | g/cm3 | 4.8~5.0 | |
The coefficient of linear expansion | αR | °C-1 | 7~15 × 10-6 | |
Hardness | HV | HV | 480~580 |
Permanent ferrite magnet industry standard of USA
Grade | Br | Hcb | Hcj | (BH)max | D |
C1 | 230 | 148 | 258 | 8.36 | 4.8 |
C5 | 380 | 191 | 199 | 27 | 4.8 |
C7 | 370±10 | 270±8 | 318±8 | 26.1±0.8 | 4.8 |
C8A | 390±10 | 231±8 | 235±8 | 28.7±0.8 | 4.8 |
C8B | 410±10 | 231±8 | 235±8 | 32.6±0.8 | 4.9 |
C9 | 380±10 | 279±8 | 318±8 | 26.2±0.8 | 4.8 |
C10 | 400±10 | 267±8 | 279±8 | 30.3±0.8 | 4.9 |
C11 | 420±10 | 223±8 | 227±8 | 34.2±0.8 | 4.9 |
C12 | 400±10 | 290±8 | 318±8 | 32.0±0.8 | 4.9 |
SJ/T10410-2000 permanent hard ferrite magnet standard
Grade | Br | Hcb | Hcj | (BH)max | ||||
mT | Gs | KA/m | Oe | KA/m | Oe | KJ/m3 | MGOe | |
Y8T | 200~235 | ≥2000 | 125~160 | ≥1570 | 210~280 | ≥2610 | 6.5~9.5 | ≥0.8 |
Y22H | 310~360 | ≥3100 | 220~250 | ≥2770 | 280~320 | ≥3520 | 20.0~24.0 | ≥2.5 |
Y25 | 360~400 | ≥3600 | 135~170 | ≥1700 | 140~200 | ≥1760 | 22.5~28.0 | ≥2.8 |
Y26H-1 | 360~390 | ≥3600 | 200~250 | ≥2512 | 225~255 | ≥2830 | 23.0~28.0 | ≥2.9 |
Y26H-2 | 360~380 | ≥3600 | 263~288 | ≥3300 | 318~350 | ≥4000 | 24.0~28.0 | ≥3.0 |
Y27H | 350~380 | ≥3500 | 225~240 | ≥2830 | 235~260 | ≥2950 | 25.0~29.0 | ≥3.1 |
Y28 | 370~400 | ≥3700 | 175~210 | ≥2200 | 180~220 | ≥2260 | 26.0~30.0 | ≥3.3 |
Y28H-1 | 380~400 | ≥3800 | 240~260 | ≥3020 | 250~280 | ≥3140 | 27.0~30.0 | ≥3.4 |
Y28H-2 | 360~380 | ≥3600 | 271~295 | ≥3400 | 382~405 | ≥4800 | 26.0~30.0 | ≥3.3 |
Y30H-1 | 380~400 | ≥3800 | 230~275 | ≥2890 | 235~290 | ≥2950 | 27.0~32.5 | ≥3.4 |
Y30H-2 | 395~415 | ≥3950 | 275~300 | ≥3460 | 310~335 | ≥3900 | 27.0~32.0 | ≥3.4 |
Y32 | 400~420 | ≥4000 | 160~190 | ≥2010 | 165~195 | ≥2070 | 30.0~33.5 | ≥3.8 |
Y32H-1 | 400~420 | ≥ 4000 | 190~230 | ≥2390 | 230~250 | ≥2890 | 31.0~35.0 | ≥3.9 |
Y32H-2 | 400~440 | ≥ 4000 | 224~240 | ≥2810 | 230~250 | ≥2890 | 31.0~34.0 | ≥3.9 |
Y33 | 410~430 | ≥ 4100 | 220~250 | ≥2760 | 225~255 | ≥2830 | 31.5~35.0 | ≥4.0 |
Y33H | 410~430 | ≥ 4100 | 250~270 | ≥3140 | 250~275 | ≥3140 | 31.5~35.0 | ≥4.0 |
Y34 | 420~440 | ≥ 4200 | 200~230 | ≥2510 | 205~235 | ≥2580 | 32.5~36.0 | ≥4.1 |
Y35 | 430~450 | ≥ 4300 | 215~239 | ≥2700 | 217~241 | ≥2730 | 33.1~33.2 | ≥4.2 |
Y36 | 440~450 | ≥ 4400 | 247~271 | ≥3100 | 250~374 | ≥3140 | 35.1~38.3 | ≥4.4 |
Y38 | 440~460 | ≥ 4400 | 285~305 | ≥3580 | 294~310 | ≥3690 | 36.6~40.6 | ≥4.6 |
Y40 | 450~460 | ≥ 4500 | 330~354 | ≥4150 | 340~360 | ≥4270 | 37.6~41.8 | ≥4.7 |
SJ285-77 permanent ferrite magnets standard
Grade | Br | Hcb | (BH)max | |||
T | Gs | KA/m | Oe | KJ/m3 | MGOe | |
Y10T | ≥0.20 | ≥2000 | 128~160 | 1600~2000 | 6.4~9.6 | 0.8~1.2 |
Y15 | 0.28~0.36 | 2800~3600 | 128~192 | 1600~2400 | 14.3~17.5 | 1.8~2.2 |
Y20 | 0.32~0.38 | 3200~3800 | 128~192 | 1600~2400 | 18.3~21.5 | 2.3~2.7 |
Y25 | 0.35~0.39 | 3500~3900 | 152~208 | 1900~2600 | 22.3~25.5 | 2.8~3.2 |
Y30 | 0.38~0.42 | 3800~4200 | 160~216 | 2000~2700 | 26.3~29.5 | 3.3~3.7 |
Y35 | 0.40~0.44 | 4000~4400 | 176~224 | 2200~2800 | 30.3~33.4 | 3.8~4.2 |
Y15H | ≥0.31 | ≥3100 | 232~248 | 2900~3100 | ≥17.5 | ≥2.2 |
Y20H | ≥0.34 | ≥3400 | 248~264 | 3100~3300 | ≥21.5 | ≥2.7 |
Y25BH | 0.36~0.39 | 3600~3900 | 176~216 | 2200~2700 | 23.9~27.1 | 3.0~3.4 |
Y30BH | 0.38~0.40 | 3800~4000 | 224~240 | 2800~3000 | 27.1~30.3 | 3.4~3.8 |
Permanent ferrite magnet standard of TDK
Grade | Composition | Residual Flux | Coercive Force | Intrinsic Coercive Force | Maximum Energy Product | ||||
Br | Hcb | Hcj | (BH)max | ||||||
mT | KGs | KA/m | KOe | KA/m | KOe | KJ/m3 | MGOe | ||
FB4D | SrO6Fe2O3 | 410±10 | 4.1±0.1 | 234.8±11.9 | 2.95±0.15 | 238.7±15.9 | 3.0±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±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±0.2 | 25.9±2.4 | 3.25±0.3 |
FB1A | BaO6Fe2O3 | 220±15 | 2.2±0.15 | 159.2±15.9 | 2.0±0.2 | 258.6±19.9 | 3.25±0.25 | 8.9±1.6 | 1.1±0.2 |
FB5H | SrO6Fe2O3 | 405±10 | 4.05±0.1 | 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±0.2 | 33.4±1.6 | 4.2±0.2 |
FB4B | SrO6Fe2O3 | 400±10 | 4.0±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 | SrO/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 |
FB6N | 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±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 | 226.8±11.9 | 2.85±0.15 | 229.2±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 |