Goudsmit UK Ltd
10 Cromac Place
The Gasworks
Belfast BT7 2DH

Tel: +44 (0) 2890 271001
Fax: +44 (0) 2890 271002

ISO 9001

Ferrite

A material which is cheap both in raw material and manufacturing cost. It is the most widely used magnetic product worldwide. Shapes tend to be geometric such as rings, discs and blocks and the manufacturing process is one of pressing, sintering and grinding. Energy product levels are around 4-5 MGOe, meaning that ferrite is about 7 times weaker in magnetic strength than Neodymium. Maximum operating temperatures are around 250-300^oC.

Magnetic Characteristics of Hard Ferrite Magnets

Material Grade	Residual Flux Density		Coercive Force	Intrinsic Coercive Force	Max Energy Product
	Br		Hcb	Hcj	(BH)max
	mT	Gs	KA/m	KA/m	KJ/m³
GSFD-10	210 - 230	2100 - 2300	127 - 159	211 - 235	5.6 - 8.8
GSFD-15	225 - 245	2250 - 2350	139 - 163	246 - 270	7.0 - 16.0
GSFD-23	320 - 340	3200 - 3400	135 - 167	140 - 171	18.3 - 21.5
GSFD-25	380 - 400	3800 - 4000	143 - 175	147 - 179	23.9 - 27.1
GSFD-30	390 - 410	3900 - 4100	175 - 207	179 - 211	25.5 - 28.7
GSFD-33H	390 - 410	3900 - 4100	239 - 271	243 - 275	27.1 - 30.3
GSFD-34H	370 - 390	3700 - 3900	263 - 291	307 - 330	28.7 - 30.3
GSFD-34I	370 - 390	3700 - 3900	263 - 299	342 - 378	25.5 - 28.7
GSFD-34J	370 - 390	3700 - 3900	279 - 303	385 - 406	25.5 - 28.7
GSFD-38	395 - 415	3750 - 4150	263 - 291	279 - 303	28.7 - 31.8
GSFD-40H	390 - 410	3900 - 4100	271 - 295	307 - 326	29.6 - 32.8
GSFD-40I	400 - 420	4000 - 4200	215 - 239	219 - 243	29.6 - 32.8
GSFD-42B	415 - 435	4150 - 4350	215 - 239	219 - 243	31.2 - 34.4
GSFD-44H	410 - 430	4100 - 4300	283 - 307	307 - 330	31.8 - 35.2
GSFD-46	430 - 450	4300 - 4500	247 - 271	251 - 275	35.2 - 38.4

GSFS-8	200 - 235	2000	125 - 160	210 - 280	6.5 - 9.5
GSFS-22	310 - 360	3100	220 - 250	280 - 320	20.0 - 24.0
GSFS-25	360 - 400	3600	135 - 170	140 - 200	22.5 - 28.0
GSFS-26	360 - 390	3600	200 - 250	225 - 255	23.0 - 28.0
GSFS-26H	360 - 380	3600	263 - 288	318 - 350	24.0 - 28.0
GSFS-27	350 - 380	3500	225 - 240	235 - 260	25.0 - 29.0
GSFS-28	370 - 400	3700	175 - 210	180 - 220	26.0 - 30.0
GSFS-28H	380 - 400	3800	240 - 260	250 - 280	27.0 - 30.0
GSFS-28I	360 - 380	3600	271 - 295	382 - 405	26.0 - 30.0
GSFS-30H	380 - 400	3800	230 - 275	235 - 290	27.0 - 32.5
GSFS-30I	395 - 415	3950	275 - 300	310 - 335	27.0 - 32.0
GSFS-32	400 - 420	4000	160 - 190	165 - 195	30.0 - 33.5
GSFS-32H	400 - 420	4000	190 - 230	230 - 250	34.5 - 35.0
GSFS-32I	400 - 440	4000	224 - 240	230 - 250	34.5 - 35.1
GSFS-33	410 - 430	4100	220 - 250	225 - 255	31.5 - 35.0
GSFS-33H	410 - 430	4100	250 - 270	250 - 275	31.5 - 35.0
GSFS-34	420 - 440	4200	200 - 230	205 - 235	32.5 - 36.0
GSFS-35	430 - 450	4300	215 - 239	217 - 241	33.1 - 33.2
GSFS-36	440 - 450	4400	247 - 271	250 - 374	35.1 - 38.3
GSFS-38	440 - 460	4400	285 - 305	294 - 310	36.6 - 40.6
GSFS-40	450 - 460	4500	330 - 354	340 - 360	37.6 - 41.8

Magnetic Characteristics of Injection Moulded Ferrite

Material	Remanence Br		Coercivity Hcb	Intrinsic Coercivity Hcj	Max. Energy	Density
Material	kGs	mT	kA/m	kA/m	kJ/m³	g/cm³
GSFI-1	1.10 - 1.30	110 - 130	70 - 85	190 - 230	1.5 - 3.0	2.70 - 3.00
GSFI-2	2.10 - 2.40	210 - 240	120 - 170	160 - 230	7.0 - 12.0	3.00 - 3.50
GSFI-3	2.50 - 2.60	250 - 260	164 - 174	210 - 230	11.9 - 12.5	3.35 - 3.55
GSFI-4	2.70 - 2.80	270 - 280	170 - 180	210 - 230	14.3 - 14.9	3.50 - 3.65
GSFI-5	2.86 - 2.95	285 - 295	190 - 210	210 - 250	15.5 - 16.9	3.65 - 3.75
GSFI-6	2.45 - 2.65	245 - 265	170 - 200	210 - 250	11.0 - 13.0	3.48 - 3.65