Magnet Material

Ferrite Magnets

Ferrite Magnets

Ferrite magnets are sintered permanent magnets composed of Barium or Strontium Ferrite. This class of magnets, aside from good resistance to demagnetization, has the popular advantage of low cost.

Ferrite magnets are very hard and brittle, and require specialized machining techniques. Moreover, they should be machined in an unmagnetized state. We are equipped to machine these materials to specifications.

Anisotropic grades are oriented in the manufacturing direction, and must be magnetized in the direction of orientation. Isotropic grades are not oriented and can be magnetized in any direction, although some degree of greater magnetic strength will be found in the pressing dimension, usually the shortest dimension.

Due to their low cost, Ferrite magnets enjoy a very wide range of applications, from motors and loudspeakers to toys and crafts, and are the most widely used permanent magnets today.

Surface Treatments

The corrosion resistance of Ferrite is considered excellent , and no surface treatments are required. However, Ferrite magnets may have a thin film of fine magnet powder on the surface and for clean, non-contaminated applications, some form of coating may be required. 

Anisotropic Wet Pressing ferrite magnet

Anisotropic Wet Pressing ferrite magnet

Magnetic Properties of Sintered Ferrite Magnets

National standard

Grade Value
Br Hcb(BHC) Hcj(IHC) (BH)max
mT KG KA/m KOe KA/m KOe Kj/m3 MGOe
Y10T(=C1) 200/2182.00/2.18125/1451.57/1.82210/2502.64/3.146.5/8.00.8/1.0
Y25 360/3703.60/3.70135/1501.70/1.88140/1701.76/2.1422.5/25.32.8/3.2
Y30(=C5) 380/3853.80/3.85191/2102.40/2.64199/2202.50/2.5126.0/283.4/3.7
Y30BH 380/3903.80/3.90223/2352.80/2.95231/2452.90/3.0827.0/30.03.4/3.7
Y33 410/4204.10/4.20220/2352.77/2.95225/2402.83/3.0131.5/33.04.0/4.2
Y35 400/4104.00/4.10175/1952.20/2.45180/2002.26/2.5130.0/32.03.8/4.0
C8(=C8A) 385/3903.85/3.90235/2552.95/3.20242/2653.05/3.3327.8/30.03.5/3.7
C10 400/4104.00/4.10288/3003.62/3.77280/2873.51/3.6030.4/31.93.8/4.0

Chinese standard

Material Br HcB HcJ (BH)max
mT KG KA/m Oe KA/m Oe Kj/m3 MGOe
Y8T 200~235≥2000125~160≥1570210~280≥26106.5~9.5≥0.8
Y22H 310~360≥3100220~250≥2770280~320≥352020.0~24.0≥2.5
Y25 360~400≥3600135~170≥1700140~200≥176022.5~28.0≥2.8
Y26H-1 360~390≥3600220~250≥2512225~255≥283023.0~28.0≥2.9
Y26H-2 360-380≥3600263-288≥3300318-350≥400024.0-28.0≥3.0
Y27H 370~400≥3500225-240≥2830235-260≥295025.0~29.0≥3.1
Y28 370-400≥3700175-210≥2200180-220≥226026.0-30.0≥3.3
Y28H-1 380-400≥3800240-260≥3020250-280≥314027.0-30.0≥3.1
Y28H-2 360-380≥3600271-295≥3400382-405≥180026.0-30.0≥3.3
Y30 370~4003.7~4.0175~2102.20~2.64180~2202.26~2.7726.0~30.03.3~3.8
Y30H-1 380~400≥3800230-275≥2890235-290≥295027.0~32.5≥3.4
Y30H-2 395-415≥3950275-300≥3460310-335≥390027.0~32.0≥3.4
Y32 400~420≥4000160~190≥2010165~195≥207030.0~33.5≥3.8
Y32H-1 400-420≥4000190-230≥2390230-250≥289034.5-35.0≥4.0
Y32H-2 400-440≥4000224-240≥2810230-250≥289031.0-34.0≥3.9
Y33 410~430≥4100220~250≥2760225~255≥283031.5~35.0≥4.0
Y33H 410-430≥4100250-270≥3140250-275≥314031.5-35.0≥4.0
Y34 420-440≥4200200-230≥2510205-235≥258032.5-36.0≥4.1
Y35 430-450≥4300215-239≥2700217-242≥273033.1-33.2≥4.2
Y36 440-450≥4400247-271≥3100250-374≥440035.1-38.3≥4.4
Y38 440-460≥4400285-305≥3580294-310≥369036.6-40.6≥4.6
Y40 450-460≥4500330-354≥4150340-360≥427037.6-41.8≥4.7

USA standard

Material Br HcB HcJ (BH)max
mT KG KA/m KOe KA/e KOe kj/m3 MGOe
C1 2302.31481.862583.58.361.05
C5 3803.81912.41992.5273.4
C7 3403.42583.233184.0021.92.75
C8(=C8A) 3853.852352.952423.0527.83.5
C8B 4204.22322.9132362.9632.84.12
C9 3803.82803.5163204.0126.43.32
C10 4004.02883.6172803.5130.43.82
C11 4304.32002.5122042.5634.44.32

Europe standard

The standard from International Electronics Committee(IEC404-8-1)

Grade Allowed Value (min/typical)
Br Hcb(BHC) Hcj(IHC) (BH)max
MT KG KA/m KOe KA/m KOe Kj/m3 MGOe
HF8/22 200/2202.00/2.20125/1401.57/1.76220/2302.76/2.896.5/6.80.8/1.1
HF20/19 320/3333.20/3.33170/1902.14/2.39190/2002.39/2.5120.0/21.02.5/2.7
HF20/28 310/3253.10/3.25220/2302.76/2.89280/2903.52/3.6420.0/21.02.5/2.7
HF22/30 350/3653.50/3.65255/2653.20/3.33290/3003.64/3.7722.0/23.52.8/3.0
HF24/16 350/3653.50/3.65155/1751.95/2.20160/1802.01/2.2624.0/25.53.0/3.2
HF24/23 350/3653.50/3.65220/2302.76/2.89230/2402.89/3.0124.0/25.53.0/3.2
HF24/35 360/3703.60/3.70260/2703.27/3.39350/3604.40/4.5224.0/25.53.0/3.2
HF26/16 370/3803.70/3.80155/1751.95/2.20160/1802.01/2.2626.0/27.03.2/3.4
HF26/18 370/3803.70/3.80175/1902.20/2.39180/1902.26/2.3926.0/27.03.3/3.4
HF26/24 370/3803.70/3.80230/2402.89/3.01240/2503.01/3.1426.0/27.03.3/3.4
HF26/26 370/3803.70/3.80230/2402.89/3.01260/2703.27/3.3926.0/27.03.3/3.4
HF26/30 385/3953.85/3.95260/2703.27/3.39300/3103.77/3.8926.0/27.03.3/3.4
HF28/26 385/3953.85/3.95250/2653.14/3.33260/2753.27/3.4528.0/30.03.5/3.8
HF28/28 385/3953.85/3.95260/2703.27/3.39280/2903.50/3.6028.0/30.03.5/3.8
HF30/26 395/4053.95/4.05250/2603.14/3.33260/2703.27/3.3930.0/31.53.8/3.9
HF32/17 410/4204.10/4.20160/1802.01/2.26165/1752.07/2.2032.0/33.04.0/4.1
HF32/22 410/4204.10/4.20215/2252.70/2.83220/2302.76/2.8932.0/33.04.0/4.1
HF32/25 410/4204.10/4.20240/2503.01/3.14250/2603.14/3.2732.0/33.04.0/4.1

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+/-10 234.8+/-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+/-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+/-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+/-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 SrO6Fe2O3 220+/-15 2.20+/-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+/-15 4.05+/-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 4.20+/-10 234.8+/-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 4.00+/-10 254.6+/-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 4.10+/-10 175.1+/-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 4.40+/-10 258.6+/-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 4.20+/-10 302.4+/-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 4.00+/-10 302.4+/-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 3.80+/-10 290.5+/-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 4.40+/-10 256.8+/-11.9 2.85+/-0.15 2259.2+/-11.9 2.88+/-0.15 36.7+/-1.6 4.6+/-0.2
FB5B SrO6Fe2O3 420+/-10 4.20+/-10 262.6+/-11.9 3.3+/-0.15 266.6+/-11.9 3.35+/-0.15 33.4+/-1.6 4.2+/-0.2

Physical Characteristics

Compressive Strength 1.4 x 104 kg/cm2
Required Magnetizing Field 12,000 - 15,000 Oe
Electrical Resistivity > 104 μ-ohm-cm/cm2
Density 4.7-5.0 g/cm3
Recoil Permeability 1.05 μr
Rev. Temp. Coeff. -0.20 %/°C

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