Loudspeakers and audio systems
Ring geometry, flux requirement and the loudspeaker magnetic circuit.
Ferrite Magnets — The Cost-Efficient Workhorse
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.
For Procurement
MOQ, lead time, packaging and commercial terms — go straight to a quotation.
Request a Quote →For Engineering
Grades, drawings, process data and design support for your DFM review.
Grade Datasheets & Technical Data →For Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & Documentation →Magnetic Performance at a Glance
Product Range
Ferrite Magnets — Product Gallery
Representative product forms for reference. Final geometry, material and finish are agreed for each project.
Why Ferrite?
When cost matters more than energy density — and it often does in volume production — ferrite is unbeatable.
- ✓Lowest cost per MGOe — the most economical permanent magnet material by a wide margin
- ✓Excellent corrosion resistance — ceramic oxide composition — no coating needed, ever
- ✓High electrical resistance — no eddy current losses in AC applications, unlike metallic magnets
- ✓Stable to 250°C — irreversible losses under 5% across the full range, no high-temp grade premium
Applications
| 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 |
Standard Ferrite Grades
Datasheet available for download.
| Grade | Type | Br (mT) | bHc (kA/m) | iHc (kA/m) | Max Temp | Best For |
|---|---|---|---|---|---|---|
| Y10T | Isotropic | 200–235 | 125–160 | 210–280 | 250°C | Toys, crafts, general |
| Y25 | Anisotropic | 360–400 | 215–255 | 230–280 | 250°C | Speakers, holding |
| Y30 | Anisotropic | 395–415 | 240–275 | 250–310 | 250°C | Motors, separators |
| Y30BH | Anisotropic | 380–400 | 240–270 | 280–320 | 250°C | High-resistance motors |
| Y40 | Anisotropic | 440–460 | 290–330 | 280–330 | 250°C | Premium performance |
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 — you need 10× the ferrite volume for equivalent NdFeB performance — but cost may still favor ferrite
- ✓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
Complete Technical Data
Full reference tables for Ferrite (Ceramic) Magnets — migrated from our production specification library. Click any row's PDF to download the grade datasheet.
Data table 1
| 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 (3.3-3.8) | 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) |
Data table 2
| 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) |
Data table 3
| 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) |
Data table 4
| 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 |
Application Engineering
Where ferrite magnets Fit
Typical component uses and the requirements to discuss before quotation. Suitability depends on your design and validation criteria.
Household appliance motors
Motor starting duty, demagnetization margin and arc geometry.
Automotive auxiliary motors
Temperature range, vibration and rotor or stator interfaces.
Sensors and switching devices
Actuation field, working distance and dimensional consistency.
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 materials →Frequently 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's Br actually increases as temperature decreases (positive temperature coefficient below room temp for bHc — meaning higher demagnetization risk at cold). Most motor designs verify performance at the coldest expected operating condition. We test per your specified range.
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.
Production & Supply Planning
Ferrite Magnets: A Defined Route to Repeat Orders
Agree the process, acceptance criteria and shipment plan before production starts. The quotation identifies the producing site and the controls required for your part.
Confirm the manufacturing route
Confirm ferrite grade, pressing direction, sintering and grinding requirements for the specified geometry.
Approve the inspection plan
Agree magnetic properties, dimensions and the acceptance limits for chips or surface defects.
Qualify before repeat supply
Define sample approval, drawing revision and lot identification. Agree how material, process or site changes will be reviewed before implementation.
Plan releases and delivery
Confirm order quantities, capacity allocation, packaging and shipping terms against your forecast. Delivery dates and any buffer-stock arrangement belong in the agreed supply plan.
Have a Drawing or Specification?
Send it to our team for engineering review and quotation — grade recommendation included.