Description-Ferrite Disc magnets
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 Ferrite Disc 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 the FerriteDiscs 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 Ferrite Disc 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 Ferrite Disc magnets and to produce custom magnet shapes and even diametrically magnetised Ferrite Disc 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 | Greater than or equal to 2000 | 125-160 | Greater than or equal to 1570 | 210-280 | Greater than or equal to 2610 | 6.5-9.5 | Greater than or equal to 0.8 | 4.8 |
Y22H | 310-360 | Greater than or equal to 3100 | 220-250 | Greater than or equal to 2770 | 280-320 | Greater than or equal to 3520 | 20.0-24.0 | Greater than or equal to 2.5 | 4.9 |
Y25 | 360-400 | Greater than or equal to 3600 | 135-170 | Greater than or equal to 1700 | 140-200 | Greater than or equal to 1760 | 22.5-28.0 | Greater than or equal to 2.8 | 4.9 |
Y26H-1 | 360-390 | Greater than or equal to 3600 | 200-250 | Greater than or equal to 2512 | 225-255 | Greater than or equal to 2830 | 23.0-28.0 | Greater than or equal to 2.9 | 4.9 |
Y26H-2 | 360-380 | Greater than or equal to 3600 | 263-288 | Greater than or equal to 3300 | 318-350 | Greater than or equal to 4000 | 24.0-28.0 | Greater than or equal to 3 | 4.9 |
Y27H | 350-380 | Greater than or equal to 3500 | 225-240 | Greater than or equal to 2830 | 235-260 | Greater than or equal to 2950 | 25.0-29.0 | Greater than or equal to 3.1 | 4.9 |
Y28 | 370-400 | Greater than or equal to 3700 | 175-210 | Greater than or equal to 2200 | 180-220 | Greater than or equal to 2260 | 26.0-30.0 | Greater than or equal to 3.3 | 4.9 |
Y28H-1 | 380-400 | Greater than or equal to 3800 | 240-260 | Greater than or equal to 3020 | 250-280 | Greater than or equal to 3140 | 27.0-30.0 | Greater than or equal to 3.4 | 4.9 |
Y28H-2 | 360-380 | Greater than or equal to 3600 | 271-295 | Greater than or equal to 3400 | 382-405 | Greater than or equal to 4800 | 26.0-30.0 | Greater than or equal to 3.3 | 4.9 |
Y30 | 370-400 | Greater than or equal to 3700 | 175-210 | Greater than or equal to 2200 | 180-220 | Greater than or equal to 2260 | 26.0-30.0 | Greater than or equal to 3.3 | 4.9 |
Y30BH | 380-390 | Greater than or equal to 3800 | 223-235 | Greater than or equal to 2800 | 231-245 | Greater than or equal to 2900 | 27.0-30.0 | Greater than or equal to 3.4 | 4.9 |
Y30H-1 | 380-400 | Greater than or equal to 3800 | 230-275 | Greater than or equal to 2890 | 235-290 | Greater than or equal to 2950 | 27.0-32.5 | Greater than or equal to 3.4 | 4.9 |
Y30H-2 | 395-415 | Greater than or equal to 3950 | 275-300 | Greater than or equal to 3460 | 310-335 | Greater than or equal to 3900 | 27.0-32.0 | Greater than or equal to 3.4 | 4.9 |
Y32 | 400-420 | Greater than or equal to 4000 | 160-190 | Greater than or equal to 2010 | 165-195 | Greater than or equal to 2070 | 30.0-33.5 | Greater than or equal to 3.8 | 4.9 |
Y32H-1 | 400-420 | Greater than or equal to 4000 | 190-230 | Greater than or equal to 2390 | 230-250 | Greater than or equal to 2890 | 31.0-35.0 | Greater than or equal to 3.9 | 4.9 |
Y32H-2 | 400-440 | Greater than or equal to 4000 | 224-240 | Greater than or equal to 2810 | 230-250 | Greater than or equal to 2890 | 31.0-34.0 | Greater than or equal to 3.9 | 4.9 |
Y33 | 410-430 | Greater than or equal to 4100 | 220-250 | Greater than or equal to 2760 | 225-255 | Greater than or equal to 2830 | 31.5-35.0 | Greater than or equal to 4 | 4.9 |
Y33H | 410-430 | Greater than or equal to 4100 | 250-270 | Greater than or equal to 3140 | 250-275 | Greater than or equal to 3140 | 31.5-35.0 | Greater than or equal to 4 | 4.9 |
Y34 | 420-440 | Greater than or equal to 4200 | 200-230 | Greater than or equal to 2510 | 205-235 | Greater than or equal to 2580 | 32.5-36.0 | Greater than or equal to 4.1 | 4.9 |
Y35 | 430-450 | Greater than or equal to 4300 | 215-239 | Greater than or equal to 2700 | 217-241 | Greater than or equal to 2730 | 33.1-33.2 | Greater than or equal to 4.2 | 4.9 |
Y36 | 440-450 | Greater than or equal to 4400 | 247-271 | Greater than or equal to 3100 | 250-374 | Greater than or equal to 3140 | 35.1-38.3 | Greater than or equal to 4.4 | 4.9 |
Y38 | 440-460 | Greater than or equal to 4400 | 285-305 | Greater than or equal to 3580 | 294-310 | Greater than or equal to 3690 | 36.6-40.6 | Greater than or equal to 4.6 | 4.9 |
Y40 | 450-460 | Greater than or equal to 4500 | 330-354 | Greater than or equal to 4150 | 340-360 | Greater than or equal to 4270 | 37.6-41.8 | Greater than or equal to 4.7 | 4.9 |
Physical property of Hard Ferrite magnets
Curie Temperature ( degree ) | 450 |
Maximum Operating Temperature ( degree ) | 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 ( percent / degree ) | -0.2 |
Temperature Coefficient of iHc ( percent / degree ) | 0.3 |
Tensile Strength (N/mm) | <> |
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 | degree | ||
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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