Sintered Ferrite Magnets
Injection Molded NdFeB Magnets
Hard Ferrite Magnet
The hard ferrite is manufactured with SrO or BaO and Fe2O3 by ceramic process. Because of its cheaper price, and production process is relatively simple, compared with the prices of their products relatively cheap in terms of other magnets. The main raw materials of ferrite magnets is oxide, so, it could not be eroded due to the impact of chemical substances or the environment (except for acid). Therefore, the surface does not need electroplating treatment. It is mainly used in handicrafts, drawing annex, toys, motor, loud speakers.
Sintered Ferrite Magnets
Hard ferrite magnets are manufactured by a die pressing followed by sintering process which allows economic production of components in a varied array of sizes and shapes. Ferrite magnets have excellent corrosion resistance and have normal operating capabilities between -40 oC and +250 oC.
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Magnetic Properties of Sintered Ferrite Magnets
National standard
Grade |
Value |
|||||||
Br |
Hcb(BHC) |
Hcj(IHC) |
(BH)max |
|||||
mT |
KG |
KA/m |
KOe |
KA/m |
KOe |
Kj/m3 |
MGOe |
|
Y10T(=C1) |
200/218 |
2.00/2.18 |
125/145 |
1.57/1.82 |
210/250 |
2.64/3.14 |
6.5/8.0 |
0.8/1.0 |
Y25 |
360/370 |
3.60/3.70 |
135/150 |
1.70/1.88 |
140/170 |
1.76/2.14 |
22.5/25.3 |
2.8/3.2 |
Y30(=C5) |
380/385 |
3.80/3.85 |
191/210 |
2.40/2.64 |
199/220 |
2.50/2.51 |
26.0/28 |
3.4/3.7 |
Y30BH |
380/390 |
3.80/3.90 |
223/235 |
2.80/2.95 |
231/245 |
2.90/3.08 |
27.0/30.0 |
3.4/3.7 |
Y33 |
410/420 |
4.10/4.20 |
220/235 |
2.77/2.95 |
225/240 |
2.83/3.01 |
31.5/33.0 |
4.0/4.2 |
Y35 |
400/410 |
4.00/4.10 |
175/195 |
2.20/2.45 |
180/200 |
2.26/2.51 |
30.0/32.0 |
3.8/4.0 |
C8(=C8A) |
385/390 |
3.85/3.90 |
235/255 |
2.95/3.20 |
242/265 |
3.05/3.33 |
27.8/30.0 |
3.5/3.7 |
C10 |
400/410 |
4.00/4.10 |
288/300 |
3.62/3.77 |
280/287 |
3.51/3.60 |
30.4/31.9 |
3.8/4.0 |
Chinese standard
Material |
Br |
HcB |
HcJ |
(BH)max |
||||
mT |
KG |
KA/m |
Oe |
KA/m |
Oe |
Kj/m3 |
MGOe |
|
Y8T |
200~235 |
≥2000 |
125~160 |
≥1570 |
210~280 |
≥2610 |
6.5~9.5 |
≥0.8 |
Y22H |
310~360 |
≥3100 |
220~250 |
≥2770 |
280~320 |
≥3520 |
20.0~24.0 |
≥2.5 |
Y25 |
360~400 |
≥3600 |
135~170 |
≥1700 |
140~200 |
≥1760 |
22.5~28.0 |
≥2.8 |
Y26H-1 |
360~390 |
≥3600 |
220~250 |
≥2512 |
225~255 |
≥2830 |
23.0~28.0 |
≥2.9 |
Y26H-2 |
360-380 |
≥3600 |
263-288 |
≥3300 |
318-350 |
≥4000 |
24.0-28.0 |
≥3.0 |
Y27H |
370~400 |
≥3500 |
225-240 |
≥2830 |
235-260 |
≥2950 |
25.0~29.0 |
≥3.1 |
Y28 |
370-400 |
≥3700 |
175-210 |
≥2200 |
180-220 |
≥2260 |
26.0-30.0 |
≥3.3 |
Y28H-1 |
380-400 |
≥3800 |
240-260 |
≥3020 |
250-280 |
≥3140 |
27.0-30.0 |
≥3.1 |
Y28H-2 |
360-380 |
≥3600 |
271-295 |
≥3400 |
382-405 |
≥1800 |
26.0-30.0 |
≥3.3 |
Y30 |
370~400 |
3.7~4.0 |
175~210 |
2.20~2.64 |
180~220 |
2.26~2.77 |
26.0~30.0 |
3.3~3.8 |
Y30H-1 |
380~400 |
≥3800 |
230-275 |
≥2890 |
235-290 |
≥2950 |
27.0~32.5 |
≥3.4 |
Y30H-2 |
395-415 |
≥3950 |
275-300 |
≥3460 |
310-335 |
≥3900 |
27.0~32.0 |
≥3.4 |
Y32 |
400~420 |
≥4000 |
160~190 |
≥2010 |
165~195 |
≥2070 |
30.0~33.5 |
≥3.8 |
Y32H-1 |
400-420 |
≥4000 |
190-230 |
≥2390 |
230-250 |
≥2890 |
34.5-35.0 |
≥4.0 |
Y32H-2 |
400-440 |
≥4000 |
224-240 |
≥2810 |
230-250 |
≥2890 |
31.0-34.0 |
≥3.9 |
Y33 |
410~430 |
≥4100 |
220~250 |
≥2760 |
225~255 |
≥2830 |
31.5~35.0 |
≥4.0 |
Y33H |
410-430 |
≥4100 |
250-270 |
≥3140 |
250-275 |
≥3140 |
31.5-35.0 |
≥4.0 |
Y34 |
420-440 |
≥4200 |
200-230 |
≥2510 |
205-235 |
≥2580 |
32.5-36.0 |
≥4.1 |
Y35 |
430-450 |
≥4300 |
215-239 |
≥2700 |
217-242 |
≥2730 |
33.1-33.2 |
≥4.2 |
Y36 |
440-450 |
≥4400 |
247-271 |
≥3100 |
250-374 |
≥4400 |
35.1-38.3 |
≥4.4 |
Y38 |
440-460 |
≥4400 |
285-305 |
≥3580 |
294-310 |
≥3690 |
36.6-40.6 |
≥4.6 |
Y40 |
450-460 |
≥4500 |
330-354 |
≥4150 |
340-360 |
≥4270 |
37.6-41.8 |
≥4.7 |
USA standard
Material |
Br |
HcB |
HcJ |
(BH)max |
||||
mT |
KG |
KA/m |
KOe |
KA/e |
KOe |
kj/m3 |
MGOe |
|
C1 |
230 |
2.3 |
148 |
1.86 |
258 |
3.5 |
8.36 |
1.05 |
C5 |
380 |
3.8 |
191 |
2.4 |
199 |
2.5 |
27 |
3.4 |
C7 |
340 |
3.4 |
258 |
3.23 |
318 |
4.00 |
21.9 |
2.75 |
C8(=C8A) |
385 |
3.85 |
235 |
2.95 |
242 |
3.05 |
27.8 |
3.5 |
C8B |
420 |
4.2 |
232 |
2.913 |
236 |
2.96 |
32.8 |
4.12 |
C9 |
380 |
3.8 |
280 |
3.516 |
320 |
4.01 |
26.4 |
3.32 |
C10 |
400 |
4.0 |
288 |
3.617 |
280 |
3.51 |
30.4 |
3.82 |
C11 |
430 |
4.3 |
200 |
2.512 |
204 |
2.56 |
34.4 |
4.32 |
Europe standard
The standard from International Electronics Committee(IEC404-8-1)
Grade |
Allowed Value (min/typical) |
|||||||
Br |
Hcb(BHC) |
Hcj(IHC) |
(BH)max |
|||||
MT |
KG |
KA/m |
KOe |
KA/m |
KOe |
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 |
175/190 |
2.20/2.39 |
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 |
160/180 |
2.01/2.26 |
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 |
Japan TDK standard
Grade |
Composition |
Br |
Hcb |
Hcj |
BH max |
||||
mT |
kG |
kA/m |
kOe |
kA/m |
kOe |
KJ/m3 |
MGOe |
||
FB40 |
SrO6Fe2O3 |
410+/-10 |
4.1+/-10 |
234.8+/-11.9 |
2.95+/-0.15 |
238.7+/-15.9 |
3.0+/-0.2 |
31.4+/-1.6 |
3.95+/-0.2 |
FB3N |
SrO6Fe2O3 |
395+/-15 |
3.95+/-15 |
234.8+/-11.9 |
2.95+/-0.15 |
238.7+/-15.9 |
3.0+/-0.2 |
28.7+/-2.4 |
3.6+/-0.3 |
FB3G |
SrO6Fe2O3 |
375+/-15 |
3.75+/-15 |
254.6+/-15.9 |
3.2+/-0.2 |
270.6+/-19.9 |
3.4+/-0.25 |
25.9+/-2.4 |
3.25+/-0.3 |
FB3X |
SrO6Fe2O3 |
375+/-15 |
3.75+/-15 |
234.8+/-11.9 |
2.95+/-0.15 |
238.7+/-15.9 |
3.0+/-0.2 |
25.9+/-2.4 |
3.25+/-0.3 |
FB1A |
SrO6Fe2O3 |
220+/-15 |
2.20+/-15 |
159.2+/-15.9 |
2.0+/-0.2 |
258.6+/-19.9 |
3.25+/-0.25 |
8.9+/-1.6 |
1.1+/-0.2 |
FB5H |
SrO6Fe2O3 |
405+/-15 |
4.05+/-15 |
298.4+/-11.9 |
3.75+/-0.15 |
322.3+/-11.9 |
4.05+/-0.15 |
31.1+/-1.6 |
3.9+/-0.2 |
FB4X |
SrO6Fe2O3 |
420+/-10 |
4.20+/-10 |
234.8+/-11.9 |
2.95+/-0.15 |
238.7+/-15.9 |
3.0+/-0.2 |
33.4+/-1.6 |
4.2+/-0.2 |
FB4B |
SrO6Fe2O3 |
400+/-10 |
4.00+/-10 |
254.6+/-11.9 |
3.2+/-0.2 |
262.6+/-19.9 |
3.3+/-0.25 |
30.3+/-1.6 |
3.8+/-0.2 |
FB4A |
SrO/ BaO6Fe2O3 |
410+/-10 |
4.10+/-10 |
175.1+/-15.9 |
2.2+/-0.2 |
176.7+/-15.9 |
2.22+/-0.2 |
31.8+/-1.6 |
4.0+/-0.2 |
FBGN |
SrO6Fe2O3 |
440+/-10 |
4.40+/-10 |
258.6+/-11.9 |
3.25+/-0.15 |
262.6+/-11.9 |
3.3+/-0.15 |
36.7+/-1.6 |
4.6+/-0.2 |
FB6B |
SrO6Fe2O3 |
420+/-10 |
4.20+/-10 |
302.4+/-11.9 |
3.8+/-0.15 |
318.3+/-11.9 |
4.0+/-0.15 |
33.4+/-1.6 |
4.2+/-0.2 |
FB6H |
SrO6Fe2O3 |
400+/-10 |
4.00+/-10 |
302.4+/-11.9 |
3.8+/-0.15 |
358.1+/-11.9 |
4.5+/-0.15 |
30.3+/-1.6 |
3.8+/-0.2 |
FB6E |
SrO6Fe2O3 |
380+/-10 |
3.80+/-10 |
290.5+/-11.9 |
3.65+/-0.15 |
393.9+/-11.9 |
4.95+/-0.15 |
27.5+/-1.6 |
3.45+/-0.2 |
FB5N |
SrO6Fe2O3 |
440+/-10 |
4.40+/-10 |
256.8+/-11.9 |
2.85+/-0.15 |
2259.2+/-11.9 |
2.88+/-0.15 |
36.7+/-1.6 |
4.6+/-0.2 |
FB5B |
SrO6Fe2O3 |
420+/-10 |
4.20+/-10 |
262.6+/-11.9 |
3.3+/-0.15 |
266.6+/-11.9 |
3.35+/-0.15 |
33.4+/-1.6 |
4.2+/-0.2 |
Physical Characteristics
Compressive Strength |
1.4 x 104 kg/cm2 |
Required Magnetizing Field |
12,000 - 15,000 Oe |
Electrical Resistivity |
> 104 μ-ohm-cm/cm2 |
Density |
4.7-5.0 g/cm3 |
Recoil Permeability |
1.05 μr |
Rev. Temp. Coeff. |
-0.20 %/°C |
