Description
Ferrite, (also known as Ceramic) disc magnets are round coin-shaped Ceramic Ferrite magnets of varying diameter and thickness. They are almost always manufactured as axially magnetised Ceramic Ferrite magnets.
Our magnets would be supplied as axially magnetised Ferrite Disc magnets unless we state otherwise. They have been magnetised along the central axis so the poles are at either end of the disc (a North on one side; a South on the other side).
Ferrite Disc magnets can be stacked on top of each other to create taller magnets which can offer more potential performance. As this height increases the performance will also increase until extra height starts to give less benefit per magnet addition. Eventually the performance plateaus off as the height increases, at which point a larger diameter disc magnet may be needed if more performance is required.
Starting with thinner magnets then increasing height is a good test method when you are unsure what performance and/or magnet size you require. Ferrite Disc magnets can be glued in place as required. They do not like being press fitted - too more compaction force risks breaking, chipping or shattering the magnets. The ceramic magnets give more pull force when attracting another magnet than when attracting a ferromagnetic (e.g. mild steel) part.
The Ferrite Disc magnets are unplated as standard. It is possible to plate and polish magnets and to produce custom magnet shapes and even diametrically magnetised magnets upon request. We can also produce alternative grades of Ferrite upon request - we supply custom magnets.
Typical Magnetic Performance for Hard Ferrite magnet
Grade | Remanence | Coercive Force | Intrinsic Coercive | Max Energy | Density | ||||
Br | Hcb | Hcj | (BH)max | ||||||
mT | Gs | KA/m | Oe | KA/m | Oe | KJ/m3 | MGOe | g/cm3 | |
Y8T | 200-235 | ≧2000 | 125-160 | ≧1570 | 210-280 | ≧2610 | 6.5-9.5 | ≧0.8 | 4.8 |
Y22H | 310-360 | ≧3100 | 220-250 | ≧2770 | 280-320 | ≧3520 | 20.0-24.0 | ≧2.5 | 4.9 |
Y25 | 360-400 | ≧3600 | 135-170 | ≧1700 | 140-200 | ≧1760 | 22.5-28.0 | ≧2.8 | 4.9 |
Y26H-1 | 360-390 | ≧3600 | 200-250 | ≧2512 | 225-255 | ≧2830 | 23.0-28.0 | ≧2.9 | 4.9 |
Y26H-2 | 360-380 | ≧3600 | 263-288 | ≧3300 | 318-350 | ≧4000 | 24.0-28.0 | ≧3 | 4.9 |
Y27H | 350-380 | ≧3500 | 225-240 | ≧2830 | 235-260 | ≧2950 | 25.0-29.0 | ≧3.1 | 4.9 |
Y28 | 370-400 | ≧3700 | 175-210 | ≧2200 | 180-220 | ≧2260 | 26.0-30.0 | ≧3.3 | 4.9 |
Y28H-1 | 380-400 | ≧3800 | 240-260 | ≧3020 | 250-280 | ≧3140 | 27.0-30.0 | ≧3.4 | 4.9 |
Y28H-2 | 360-380 | ≧3600 | 271-295 | ≧3400 | 382-405 | ≧4800 | 26.0-30.0 | ≧3.3 | 4.9 |
Y30 | 370-400 | ≧3700 | 175-210 | ≧2200 | 180-220 | ≧2260 | 26.0-30.0 | ≧3.3 | 4.9 |
Y30BH | 380-390 | ≧3800 | 223-235 | ≧2800 | 231-245 | ≧2900 | 27.0-30.0 | ≧3.4 | 4.9 |
Y30H-1 | 380-400 | ≧3800 | 230-275 | ≧2890 | 235-290 | ≧2950 | 27.0-32.5 | ≧3.4 | 4.9 |
Y30H-2 | 395-415 | ≧3950 | 275-300 | ≧3460 | 310-335 | ≧3900 | 27.0-32.0 | ≧3.4 | 4.9 |
Y32 | 400-420 | ≧4000 | 160-190 | ≧2010 | 165-195 | ≧2070 | 30.0-33.5 | ≧3.8 | 4.9 |
Y32H-1 | 400-420 | ≧4000 | 190-230 | ≧2390 | 230-250 | ≧2890 | 31.0-35.0 | ≧3.9 | 4.9 |
Y32H-2 | 400-440 | ≧4000 | 224-240 | ≧2810 | 230-250 | ≧2890 | 31.0-34.0 | ≧3.9 | 4.9 |
Y33 | 410-430 | ≧4100 | 220-250 | ≧2760 | 225-255 | ≧2830 | 31.5-35.0 | ≧4 | 4.9 |
Y33H | 410-430 | ≧4100 | 250-270 | ≧3140 | 250-275 | ≧3140 | 31.5-35.0 | ≧4 | 4.9 |
Y34 | 420-440 | ≧4200 | 200-230 | ≧2510 | 205-235 | ≧2580 | 32.5-36.0 | ≧4.1 | 4.9 |
Y35 | 430-450 | ≧4300 | 215-239 | ≧2700 | 217-241 | ≧2730 | 33.1-33.2 | ≧4.2 | 4.9 |
Y36 | 440-450 | ≧4400 | 247-271 | ≧3100 | 250-374 | ≧3140 | 35.1-38.3 | ≧4.4 | 4.9 |
Y38 | 440-460 | ≧4400 | 285-305 | ≧3580 | 294-310 | ≧3690 | 36.6-40.6 | ≧4.6 | 4.9 |
Y40 | 450-460 | ≧4500 | 330-354 | ≧4150 | 340-360 | ≧4270 | 37.6-41.8 | ≧4.7 | 4.9 |
Physical property of Hard Ferrite magnets
Curie Temperature (°C) | 450 |
Maximum Operating Temperature (°C) | 250 |
Hardness (Hv) | 480-580 |
Density (g/cm3) | 4.8 - 4.9 |
Relative Recoil Permeability (μrec) | 1.05 - 1.20 |
Saturation Field Strength, kOe (KA/m) | 10 (800) |
Temperature Coefficient of Br (%/°C) | -0.2 |
Temperature Coefficient of iHc (%/°C) | 0.3 |
Tensile Strength (N/mm) | <100 |
Transverse Rupture Strength (N/mm) | 300 |
USA Standard - Permanent Ferrite / Ceramic magnet
Grade | Remanence | Coercive Force | Intrinsic Coercive | Max Energy | Density | Tw Max | Remark | ||||
Br | Hcb | Hcj | BHmax | ||||||||
KGs | mT | KOe | KA/m | KOe | KA/m | KJ/m3 | MGOe | g/cm3 | ℃ | ||
C1 | 2.3 | 230 | 1.86 | 150 | 3.5 | 258 | 8.36 | 1.05 | 4.8 | 250 | Isotropic |
C5 | 3.8 | 380 | 2.4 | 190 | 2.5 | 200 | 27.1 | 3.4 | 4.9 | 250 | |
C7 | 3.4 | 340 | 3.23 | 258 | 4.0 | 318 | 21.9 | 2.75 | 4.9 | 250 | |
C8(C8A) | 3.85 | 385 | 2.95 | 235 | 3.0 | 240 | 27.8 | 3.5 | 4.9 | 250 | Anisotropic |
C8B | 4.2 | 420 | 2.9 | 232 | 2.96 | 236 | 32.8 | 4.1 | 4.9 | 250 | |
C9 | 3.8 | 380 | 3.5 | 280 | 4.0 | 320 | 26.4 | 3.3 | 4.9 | 250 | |
C10 | 4.0 | 400 | 3.6 | 288 | 3.5 | 280 | 30.4 | 3.8 | 4.9 | 250 | |
C11 | 4.3 | 430 | 2.5 | 200 | 2.55 | 204 | 34.4 | 4.3 | 4.9 | 250 | |
The Standard of International Electronics Committee (IEC404-8-1)
Grade | Remanence | Coercive Force | Intrinsic Coercive | Max Energy | Density | ||||
Br | Hcb | Hcj | (BH)max | ||||||
KGs | mT | KOe | KA/m | KOe | KA/m | KJ/m³ | MGOe | g/cm³ | |
HF8/22 | 2.00-2.20 | 200-220 | 1.57-1.76 | 125-140 | 2.76-2.89 | 220-230 | 6.5-6.8 | 0.8-1.1 | 4.8 |
HF20/19 | 3.20-3.33 | 320-333 | 2.14-2.39 | 170-190 | 2.39-2.51 | 190-200 | 20.0-21.0 | 2.5-2.7 | 4.9 |
HF20/28 | 3.10-3.25 | 310-325 | 2.76-2.89 | 220-230 | 3.52-3.64 | 280-290 | 20.0-21.0 | 2.5-2.7 | 4.9 |
HF22/30 | 3.50-3.65 | 350-365 | 3.20-3.33 | 255-265 | 3.64-3.77 | 290-300 | 22.0-23.5 | 2.8-3.0 | 4.9 |
HF24/16 | 3.50-3.65 | 350-365 | 1.95-2.20 | 155-175 | 2.01-2.26 | 160-180 | 24.0-25.5 | 3.0-3.2 | 4.9 |
HF24/23 | 3.50-3.65 | 350-365 | 2.76-2.89 | 220-230 | 2.89-3.01 | 230-240 | 24.0-25.5 | 3.0-3.2 | 4.9 |
HF24/35 | 3.60-3.70 | 360-370 | 3.27-3.39 | 260-270 | 4.40-4.52 | 350-360 | 24.0-25.5 | 3.0-3.2 | 4.9 |
HF26/16 | 3.70-3.80 | 370-380 | 1.95-2.20 | 155-175 | 2.01-2.26 | 160-180 | 26.0-27.0 | 3.2-3.4 | 4.9 |
HF26/18 | 3.70-3.80 | 370-380 | 2.20-2.39 | 175-190 | 2.26-2.39 | 180-190 | 26.0-27.0 | 3.3-3.4 | 4.9 |
HF26/24 | 3.70-3.80 | 370-380 | 2.89-3.01 | 230-240 | 3.01-3.14 | 240-250 | 26.0-27.0 | 3.3-3.4 | 4.9 |
HF26/26 | 3.70-3.80 | 370-380 | 2.89-3.01 | 230-240 | 3.27-3.39 | 260-270 | 26.0-27.0 | 3.3-3.4 | 4.9 |
HF26/30 | 3.85-3.95 | 385-395 | 3.27-3.39 | 260-270 | 3.77-3.89 | 300-310 | 26.0-27.0 | 3.3-3.4 | 4.9 |
HF28/26 | 3.85-3.95 | 385-395 | 3.14-3.33 | 250-265 | 3.27-3.45 | 260-275 | 28.0-30.0 | 3.5-3.8 | 4.9 |
HF28/28 | 3.85-3.95 | 385-395 | 3.27-3.39 | 260-270 | 3.50-3.60 | 280-290 | 28.0-30.0 | 3.5-3.8 | 4.9 |
HF30/26 | 3.95-4.05 | 395-405 | 3.14-3.33 | 250-260 | 3.27-3.39 | 260-270 | 30.0-31.5 | 3.8-3.9 | 4.9 |
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