Sintered ferrite (strontium and barium) magnets — the lowest-cost permanent magnet. Arcs, rings and blocks for high-volume industrial motors, sensors and consumer applications. No coating required, immune to corrosion.
Lowest unit cost of any permanent magnet — ideal for high-volume consumer and industrial applications.
Ceramic material — no coating required, no oxidation, no risk of demagnetization from corrosion.
Operating temperatures up to 250°C, with very low reversible temperature coefficient.
No plated or coated surfaces to fail. Specified in motors, sensors and outdoor applications for decades.
Arcs, rings and blocks for high-volume motor, sensor and separator designs.
Motor arc segments for high-volume designs
Ring geometry for speakers and sensors
Block geometry for holders and separators
Round geometry for general industrial use
The tables below preserve the legacy empiremagnets.com product information and reference values. Use them for first-pass selection; final acceptance values remain project-specific.
| Application | Typical Spec | Why this material |
|---|---|---|
| DC / appliance motors | Y30 / Y30BH | Low cost and robust high-volume performance |
| Loudspeakers | Y25 / Y30 | Large magnet volume at economical cost |
| Magnetic separators | Y40 anisotropic | Higher ferrite energy for large field structures |
| Automotive sensing / small motors | Y30BH | Temperature-stable and corrosion-resistant |
| Consumer / crafts | Y10T isotropic | Low-cost geometry with flexible magnetization direction |
| Type | Orientation | Relative performance | Magnetization flexibility | Best fit |
|---|---|---|---|---|
| Isotropic | No preferred particle orientation | Lower | Can be magnetized in multiple directions | Cost-critical, multipole, consumer applications |
| Anisotropic | Particles aligned during pressing | Higher | Preferred direction fixed by manufacturing | Motors, speakers, separators |
| Wet-pressed anisotropic | Field-oriented slurry pressing | Highest mainstream ferrite performance | Preferred direction fixed | Higher-performance motor segments / rings |
| Grade | Br mT (kGs) | Hcb kA/m (kOe) | Hcj kA/m (kOe) | (BH)max kJ/m³ (MGOe) | |
|---|---|---|---|---|---|
| Y8T | 200-235 (2.0-2.35) | 125-160 (1.57-2.01) | 210-280 (2.64-3.52) | 6.5-9.5 (0.8-1.2) | Datasheet |
| Y10T | 200-235 (2.0-2.35) | 128-160 (1.61-2.01) | 210-280 (2.64-3.52) | 6.4-9.6 (0.8-1.2) | Datasheet |
| Y20 | 320-380 (3.2-3.8) | 135-190 (1.70-2.39) | 140-195 (1.76-2.45) | 18.0-22.0 (2.3-2.8) | Datasheet |
| Y22H | 310-360 (3.1-3.6) | 220-250 (2.76-3.14) | 280-320 (3.52-4.02) | 20.0-24.0 (2.5-3.0) | Datasheet |
| Y23 | 320-370 (3.2-3.7) | 170-190 (2.14-2.39) | 190-230 (2.39-2.89) | 20.0-25.5 (2.5-3.2) | Datasheet |
| Y25 | 360-400 (3.6-4.0) | 135-170 (1.70-2.14) | 140-200 (1.76-2.51) | 22.5-28.0 (2.8-3.5) | Datasheet |
| Y26H | 360-390 (3.6-3.9) | 220-250 (2.76-3.14) | 225-255 (2.83-3.20) | 23.0-28.0 (2.9-3.5) | Datasheet |
| Y26H-1 | 360-390 (3.6-3.9) | 200-250 (2.51-3.14) | 225-255 (2.83-3.20) | 23.0-28.0 (2.9-3.5) | Datasheet |
| Y26H-2 | 360-380 (3.6-3.8) | 263-288 (3.30-3.62) | 318-350 (4.00-4.40) | 24.0-28.0 (3.0-3.5) | Datasheet |
| Y27H | 370-400 (3.7-4.0) | 205-250 (2.58-3.14) | 210-255 (2.64-3.20) | 25.0-29.0 (3.1-3.6) | Datasheet |
| Y28 | 370-400 (3.7-4.0) | 175-210 (2.20-2.64) | 180-220 (2.26-2.76) | 26.0-30.0 (3.3-3.8) | Datasheet |
| Y28H-1 | 380-400 (3.8-4.0) | 240-260 (3.02-3.27) | 250-280 (3.14-3.52) | 27.0-30.0 (3.4-3.8) | Datasheet |
| Y28H-2 | 360-380 (3.6-3.8) | 271-295 (3.41-3.71) | 382-405 (4.80-5.09) | 26.0-30.0 (3.3-3.8) | Datasheet |
| Y30 | 370-400 (3.7-4.0) | 175-210 (2.20-2.64) | 180-220 (2.26-2.76) | 26.0-30.0 (3.3-3.8) | Datasheet |
| Y30BH | 380-390 (3.8-3.9) | 223-235 (2.80-2.95) | 231-245 (2.90-3.08) | 27.0-30.0 (3.4-3.8) | Datasheet |
| Y30H-1 | 380-400 (3.8-4.0) | 230-275 (2.89-3.46) | 235-290 (2.95-3.64) | 27.0-32.0 (3.4-4.0) | Datasheet |
| Y30H-2 | 395-415 (3.95-4.15) | 275-300 (3.46-3.77) | 310-335 (3.90-4.21) | 27.0-32.5 (3.4-4.1) | Datasheet |
| Y32 | 400-420 (4.0-4.2) | 160-190 (2.01-2.39) | 165-195 (2.07-2.45) | 30.0-33.5 (3.8-4.2) | Datasheet |
| Y32H-1 | 400-420 (4.0-4.2) | 190-230 (2.39-2.89) | 230-250 (2.89-3.14) | 31.5-35.0 (4.0-4.4) | Datasheet |
| Y40 | 440-460 (4.4-4.6) | 290-330 (3.64-4.15) | 280-330 (3.52-4.15) | ~38-42 (~4.8-5.3) | Datasheet |
| Characteristic | Symbol / Unit | Reference Value |
|---|---|---|
| Density | g/cc | 4.9–5.1 |
| Vickers hardness | Hv | 400–700 |
| Compression strength | N/mm² | 680–720 |
| Specific heat capacity | J/kg·°C | 795–855 |
| Electrical resistivity | μΩ·cm | ~1 × 10¹⁰ |
| Curie temperature | °C | ~450 |
| Rev. temp. coeff. Br | %/°C | ~−0.2 |
| Rev. temp. coeff. Hci | %/°C | ~+0.27 |
Reference values are reproduced from the legacy product pages. Confirm grade, test method, tolerance, coating, temperature class and inspection criteria against the released drawing and purchase specification.
A visual record of magnetic material and assembly manufacturing, inspection and packing.
Manufacturing 
Manufacturing 
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Manufacturing 
Inspection 
Packing Ferrite is the practical choice when unit cost, corrosion immunity and high-volume repeatability matter more than maximum magnetic energy density. Its larger magnetic circuit may be the key design trade-off.
A drawing alone may not define the magnetic requirement. These inputs help us recommend the right grade, geometry, coating and inspection plan instead of quoting a generic part.
Share the maximum diameter, arc length, radial thickness and air gap. Ferrite selection often succeeds or fails on available magnetic-circuit volume.
Provide pull force, flux density, torque or speaker sensitivity target together with the test fixture and measurement position.
Describe the housing, adhesive, press fit, shock, vibration and edge-clearance requirements for the ceramic part.
State annual demand, launch quantity and expected design life. Tooling and cavity decisions should be evaluated with the forecast.
Inspection scope should follow the failure mode. We can align the report format, sample quantity and release criteria during drawing review.
Agree on the property and fixture used for acceptance. For motor arcs, include pole orientation, matching and air-gap conditions.
Set critical dimensions, arc angle, flatness, edge condition and visual limits for chips or cracks.
Validate adhesive or mechanical retention under the actual vibration, temperature and shock profile.
Track material grade, cavity or tool identification, magnetizing setup and sampling plan across production lots.
Ferrite has a lower maximum energy product, so the magnetic circuit may need more volume to reach the same air-gap performance. The final trade-off depends on geometry and system design.
Ferrite is a ceramic material and is generally corrosion resistant without a metallic coating. The housing, adhesive and exposed surface still need to be reviewed for the actual environment.
Yes. Ferrite arcs are widely used in cost-sensitive motor designs when the available volume and required torque or speed are compatible with the material's magnetic performance.
Our engineering team can review material, operating conditions, magnetic requirements, manufacturing route and validation needs before quotation.