Inspection Plan Agreement
Specify critical characteristics, sampling and acceptance criteria so the requested records match your part and application.
Plan the quality reviewFerrite Permanent Magnets
Hard ferrite (ceramic) magnets deliver reliable performance at the lowest cost per unit of magnetic energy. Excellent corrosion resistance, high electrical resistance, and stable to 250°C. Ideal for volume production.
Product Range
Ferrite Magnets — Product Gallery
Product forms, uses and selection considerations. Final specifications are agreed for each project.
Custom Ferrite Shapes
Shaped parts for cost-sensitive magnetic designs.
Rings, Blocks & Discs
Common forms for appliance and sensing applications.
Large Ring Magnets
Ring forms for speakers and annular assemblies.
Motor Arc Segments
Curved segments for permanent-magnet motor designs.
Define Orientation & Assembly Requirements
Motor arcs, speaker rings and holding discs place different demands on geometry and magnetization. Confirm the working gap and available volume alongside the magnetic grade.
State isotropic or anisotropic material, pole direction and ground surfaces on the drawing. Use the Y, C and HF references without assuming direct grade equivalence.
Compare ferrite grade references- Magnetic test direction and specimen conditions
- Crack, edge and dimensional acceptance
- Mounting forces, temperature and environmental exposure
A Practical Ceramic Magnet Family
Review shape, working gap and magnetic requirements alongside the available ferrite grades.
SELECTION GUIDEApplication selection notesExplore applications and requirements
Why Ferrite?
Ferrite is often a cost-effective choice when the available space permits a lower energy density.
- ✓Lowest cost per MGOe — the most economical permanent magnet material by a wide margin
- ✓Excellent corrosion resistance — ceramic oxide composition — often used uncoated; cleanliness, bonding and exposure can require surface treatment
- ✓High electrical resistance — helps limit eddy-current loss; alternating-field performance still depends on frequency and the complete magnetic circuit
- ✓Stable to 250°C — 250°C is a published material reference; validate output and irreversible loss at both temperature extremes
Applications
Br values in parentheses are converted from the published mT values (1 kGs = 100 mT). Reference data supports initial selection; the approved material specification governs supply.
| Application | Typical Spec | Why This Material |
|---|---|---|
| DC Motors | Y30 / Y30BH | Cost-efficient torque for appliances, automotive |
| Loudspeakers | Y25 / Y30 | Stable field, low cost, excellent for audio |
| Magnetic Separators | Y40 anisotropic | High gradient in large-volume separators |
| Automotive Sensors | Y30BH | Temperature-stable sensing from -40°C to 180°C |
| Crafts & Signage | Y10T isotropic | Cheapest magnet by volume — ideal for consumer products |
Isotropic vs Anisotropic Ferrite
The manufacturing method determines magnetic orientation and performance:
- ✓Isotropic (Y10T) — powder pressed without magnetic field alignment — magnetize in any direction, lowest cost
- ✓Anisotropic (Y25+) — powder aligned in a magnetic field during pressing — 3× stronger but fixed magnetization direction
- ✓Our recommendation — specify isotropic only for multi-pole or cost-critical applications; anisotropic is standard for motors and speakers
Ferrite Design Notes
Ferrite behaves differently from rare-earth magnets:
- ✓Low energy product — the published 10× comparison is an approximate energy-product contrast, not a volume-sizing rule; circuit geometry determines the required magnet volume
- ✓Temperature behavior — Br increases slightly as temperature drops — design for the cold end of your range
- ✓Brittleness — like all ceramics, ferrite chips under impact; specify chamfers and protective packaging
- ✓Tolerance — as-pressed ±1–2%; ground faces to ±0.05mm; most applications use as-pressed dims
Grades & Technical Data
Compare published Y, C and HF grade references. The naming systems do not imply one-to-one equivalence; final substitution requires engineering approval.
Scroll to view more columns.
Y Grades
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| Y32H-2 | 400-440 (4.0-4.4) | 224-240 (2.81-3.02) | 230-250 (2.89-3.14) | 31.0-34.0 (3.9-4.3) |
| Y33 | 410-430 (4.1-4.3) | 220-250 (2.76-3.14) | 225-255 (2.83-3.20) | 31.5-35.0 (4.0-4.4) |
| Y33H | 410-430 (4.1-4.3) | 250-270 (3.14-3.39) | 250-275 (3.14-3.46) | 31.5-35.0 (4.0-4.4) |
| Y34 | 420-440 (4.2-4.4) | 200-230 (2.51-2.89) | 205-235 (2.58-2.95) | 32.5-36.0 (4.1-4.5) |
| Y35 | 430-450 (4.3-4.5) | 215-239 (2.70-3.00) | 217-241 (2.73-3.03) | 33.1-38.2 (4.2-4.8) |
| Y36 | 430-450 (4.3-4.5) | 247-271 (3.10-3.41) | 250-274 (3.14-3.44) | 35.1-38.3 (4.4-4.8) |
| Y38 | 440-460 (4.4-4.6) | 285-305 (3.58-3.83) | 294-310 (3.69-3.90) | 36.6-40.6 (4.6-5.1) |
| Y40 | 440-460 (4.4-4.6) | 330-354 (4.15-4.45) | 340-360 (4.27-4.52) | 37.5-41.8 (4.7-5.3) |
C Grades
| Grade | Br mT (kGs) | Hcb kA/m (kOe) | Hcj kA/m (kOe) | (BH)max kJ/m³ (MGOe) |
|---|---|---|---|---|
| C1 | 230 (2.300) | 148 (1.86) | 258 (3.50) | 8.36 (1.05) |
| C5 | 380 (3.80) | 191 (2.40) | 199 (2.50) | 27.0 (3.40) |
| C7 | 340 (3.40) | 258 (3.23) | 318 (4.00) | 21.9 (2.75) |
| C8 / C8A | 385 (3.85) | 235 (2.95) | 242 (3.05) | 27.8 (3.50) |
| C8B | 420 (4.20) | 232 (2.91) | 236 (2.96) | 32.8 (4.12) |
| C9 | 380 (3.80) | 280 (3.52) | 320 (4.01) | 26.4 (3.32) |
| C10 | 400 (4.00) | 280 (3.52) | 284 (3.57) | 30.04 (3.82) |
HF Grades
| Grade | Br mT (kGs) | Hcb kA/m (kOe) | Hcj kA/m (kOe) | (BH)max kJ/m³ (MGOe) |
|---|---|---|---|---|
| HF8/22 | 200/220 (2.00/2.20) | 125/140 (1.57/1.76) | 220/230 (2.76/2.89) | 6.5/6.8 (0.8/1.1) |
| HF20/19 | 320/333 (3.20/3.33) | 170/190 (2.14/2.39) | 190/200 (2.39/2.51) | 20.0/21.0 (2.5/2.7) |
| HF20/28 | 310/325 (3.10/3.25) | 220/230 (2.76/2.89) | 280/290 (3.52/3.64) | 20.0/21.0 (2.5/2.7) |
| HF22/30 | 350/365 (3.50/3.65) | 255/265 (3.20/3.33) | 290/300 (3.64/3.77) | 22.0/23.5 (2.8/3.0) |
| HF24/16 | 350/365 (3.50/3.65) | 155/175 (1.95/2.20) | 160/180 (2.01/2.26) | 24.0/25.5 (3.0/3.2) |
| HF24/23 | 350/365 (3.50/3.65) | 220/230 (2.76/2.89) | 230/240 (2.89/3.01) | 24.0/25.5 (3.0/3.2) |
| HF24/35 | 360/370 (3.60/3.70) | 260/270 (3.27/3.39) | 350/360 (4.40/4.52) | 24.0/25.5 (3.0/3.2) |
| HF26/16 | 370/380 (3.70/3.80) | 155/175 (1.95/2.20) | 160/180 (2.01/2.26) | 26.0/27.0 (3.2/3.4) |
| HF26/18 | 370/380 (3.70/3.80) | 175/185 (2.20/2.33) | 180/190 (2.26/2.39) | 26.0/27.0 (3.3/3.4) |
| HF26/24 | 370/380 (3.70/3.80) | 230/240 (2.89/3.01) | 240/250 (3.01/3.14) | 26.0/27.0 (3.3/3.4) |
| HF26/26 | 370/380 (3.70/3.80) | 230/240 (2.89/3.01) | 260/270 (3.27/3.39) | 26.0/27.0 (3.3/3.4) |
| HF26/30 | 385/395 (3.85/3.95) | 260/270 (3.27/3.39) | 300/310 (3.77/3.89) | 26.0/27.0 (3.3/3.4) |
| HF28/26 | 385/395 (3.85/3.95) | 250/265 (3.14/3.33) | 260/275 (3.27/3.45) | 28.0/30.0 (3.5/3.8) |
| HF28/28 | 385/395 (3.85/3.95) | 260/270 (3.27/3.39) | 280/290 (3.50/3.60) | 28.0/30.0 (3.5/3.8) |
| HF30/26 | 395/405 (3.95/4.05) | 250/260 (3.14/3.33) | 260/270 (3.27/3.39) | 30.0/31.5 (3.8/3.9) |
| HF32/17 | 410/420 (4.10/4.20) | 160/170 (2.01/2.14) | 165/175 (2.07/2.20) | 32.0/33.0 (4.0/4.1) |
| HF32/22 | 410/420 (4.10/4.20) | 215/225 (2.70/2.83) | 220/230 (2.76/2.89) | 32.0/33.0 (4.0/4.1) |
| HF32/25 | 410/420 (4.10/4.20) | 240/250 (3.01/3.14) | 250/260 (3.14/3.27) | 32.0/33.0 (4.0/4.1) |
Use this single reference for grade properties, application notes and available datasheets. Confirm the selected specification with engineering before ordering.
Application Selection Notes
| Grade | Type | Temp. reference* | Typical application |
|---|---|---|---|
| Y10T | Isotropic | 250°C | Toys, crafts, general |
| Y25 | Anisotropic | 250°C | Speakers, holding |
| Y30 | Anisotropic | 250°C | Motors, separators |
| Y30BH | Anisotropic | 250°C | High-resistance motors |
| Y40 | Anisotropic | 250°C | Premium performance |
*Temperature values are selection references, not part-specific limits. Confirm the grade, magnetic circuit and test conditions before specifying.
Physical Properties
| Characteristic | Symbol | Unit | Value |
|---|---|---|---|
| Density | D | g/cc | 4.9 – 5.1 |
| Vickers Hardness | Hv | D.P.N | 400 – 700 |
| Compression Strength | C.S. | N/mm² | 680 – 720 |
| Coefficient of Thermal Expansion (∥) | C∥ | 10⁻⁶/°C | 15 |
| Coefficient of Thermal Expansion (⊥) | C⊥ | 10⁻⁶/°C | 10 |
| Specific Heat Capacity | c | J/kg·°C | 795 – 855 |
| Electrical Resistivity | ρ | μΩ·cm | 1 × 10¹⁰ |
| Thermal Conductivity | k | W/cm·°C | 0.029 |
| Tensile Strength | σUTS | Pa | 34 × 10⁶ |
| Flexural Strength | σ | Pa | 62 × 10⁶ |
| Hardness (Mohs) | — | Mohs | 7 |
| Poisson's Ratio | ν | — | 0.28 |
| Curie Temperature | Tc | °C | 450 |
| Rev. Temp. Coeff. of Induction (Br) | α | %/°C | −0.2 |
| Rev. Temp. Coeff. of Intrinsic Coercivity (Hci) | β | %/°C | +0.27 |
Engineering Guide
Permanent Magnet Material & Temperature Selection
Understand when ferrite's stability, corrosion resistance and cost outweigh the higher energy density of rare-earth magnets.
Compare magnet materialsFrequently Asked Questions
When should I use ferrite instead of NdFeB?
Choose ferrite when: size is not constrained, cost is the primary driver, you need corrosion resistance without coating, or the application operates at temperatures above 200°C without needing high energy density. Typical examples: appliance motors, speakers, magnetic separators, automotive sensors. Choose NdFeB when: size and weight matter, or you need high flux from a small volume.
Can ferrite magnets be machined?
Only by grinding. Ferrite is a hard ceramic — you cannot drill, tap, or mill it economically. Design net-shape and specify ground faces only where needed for tolerance.
How does ferrite handle cold temperatures?
Ferrite remanence generally increases as temperature falls, while coercivity decreases. That combination can increase cold-temperature demagnetization risk. Review the grade curves, operating point and opposing field at the coldest condition, and agree a validation test for the assembly.
What's the difference between BaFe and SrFe ferrite?
Barium ferrite (BaO·6Fe₂O₃) is older and slightly less powerful; strontium ferrite (SrO·6Fe₂O₃) is the modern standard with better magnetic properties. All our Y-series grades are strontium ferrite.
Available Geometries
Dry-pressed sintered ferrite in the standard motor and speaker formats, plus custom pressed shapes:
- ✓Blocks & rectangles — wide flat plates for separators and holding
- ✓Rings — loudspeaker rings and motor rotors
- ✓Arcs & segments — motor pole pieces, straight or skewed
- ✓Discs & cylinders — axial or diametric magnetization
- ✓Large blocks — up to ~150 mm for separator assemblies
Machining & Dimensional Tolerances
Ferrite is a hard, brittle ceramic — most parts ship as-sintered; diamond grinding only where required:
| Process | Typical Tolerance | Notes |
|---|---|---|
| As-sintered | ±1–2% of dimension | Most economical; standard for motor poles |
| Diamond ground | ±0.05 mm | Critical faces and speaker gaps |
| Lapped | ±0.02 mm | Gap faces on request |
| Chamfers | Per drawing | Recommended to prevent edge chipping |
Test & Quality Documentation
What ships with your parts — scoped per project during quotation.
Magnetic Properties
Certificate of Analysis with measured Br / Hcb / Hcj / (BH)max against the specified grade of your ferrite parts, from our demagnetization-curve test equipment.
Dimensional Inspection
Dimensional reports by gauge or CMM as agreed in the inspection plan; critical dimensions identified together during DFM review.
Compliance & Project Docs
RoHS / REACH declarations on request, and FAI / PPAP documentation per project requirements.
Process reference images are separated from the product gallery. They illustrate equipment and handling topics; they do not establish ownership of a facility, a customer delivery, or project-specific inspection results.
Factory Tour
Inside Ferrite Magnets Manufacturing
Ferrite production uses ceramic powder forming, long controlled sintering, grinding and high-volume release inspection for rings, blocks and motor arcs.
4 process viewsProduct-specific manufacturing
1 inspection viewRelevant quality equipment
1 packing viewProduct-appropriate protection
End-to-end process visibilityManufacturing · inspection · packing documented in one focused route
Manufacturing processInspection & testingPacking & dispatch
Automated Ferrite Production Hall
Linked production cells and material flow support high-volume ferrite manufacturing with tighter process control.
Continuous Sintering Kiln
A long roller-hearth furnace controls heating, soak and cooling zones.
Refractory Setter Loading
Pressed ceramic blanks are arranged for controlled high-temperature densification.
Automated Final Inspection
Automated stations reduce variation in appearance and dimensional release checks.
Manufacturing, inspection and packing photographs for this product family.Equipment route varies by material and geometryRemote video inspection available before shipment
Have a Drawing or Specification?
Send it to our team for engineering review and quotation — grade recommendation included.