Magnets of Hard Ferrite (HF)

Hard ferrite is well-priced magnetic material, which can be used in temperatures up to 180°C. Because of its good magnetical and mechanical stability it has a large field of applications. For example adhesive systems, speaker systems, electric motors or sensor probes. Hard ferrite is to be pressed and sintered. A later machining is practicable by the use of grinding, diamond tools, lasers and water jets.

rings

from ø 8 mm to ø 185 mm

cylinders

from ø 4 mm to ø 90 mm

blocks

from 1,2 mm to 150 mm

special designs

according to your requirements

We will give you advice for choosing the right material as well as in optimizing your application. This will reduce costs and increase your market position.

contact

Physical and chemical characteristics

Permeability: 1,05 - 1,3
Curie-temperature: 450 °C
Temp. Coefficient Br [°C-1] -0,20% 0 - 100 °C
Temp. Coefficient HcJ [°C-1] 0,40% 0 - 100 °C
Density 4,7 - 4,9 g/cm³
Electric resistance > 104 Ohm x cm
Extension Coefficient [°C-1] 7 - 15 E-6
Vickers hardness : HV ca. 480 - 580

Toxicity

Magnets of Hard Ferrite are nontoxic and do not pollute the environment.
Like all ceramic materials Hard Ferrite is very resistant against chemicals. Primarily it is attacked by concentrated inorganic acids, depending on temperature and contact duration.

Technical Details

Material	Remanence	Energy product	Coercivity Field Intensity*		max. working -
	Br [mT]	(BxH)max.[kJ/m³]	HcB [kA/m]	HcJ [kA/m]	temperature [°C]
	min.	min.	min.	min.	min.
HF8/22	200	6,5	125	220	250
HF20/19	320	20 kJ/m³	170	190	250
HF20/28	310	20 kJ/m³	220	280	250
HF22/30	350	22 kJ/m³	255	290	250
HF24/16	350	24 kJ/m³	155	160	250
HF24/23	350	24 kJ/m³	220	230	250
HF24/35	360	24 kJ/m³	260	350	250
HF26/16	370	26 kJ/m³	155	160	250
HF26/18	370	26 kJ/m³	175	180	250
HF26/24	370	26 kJ/m³	230	240	250
HF26/26	370	26 kJ/m³	230	260	250
HF26/30	385	26 kJ/m³	260	300	250
HF28/26	385	28 kJ/m³	250	260	250
HF28/28	385	28 kJ/m³	260	280	250
HF30/26	395	30 kJ/m³	250	260	250
HF32/17	410	32 kJ/m³	160	165	250
HF32/22	410	32 kJ/m³	215	220	250
HF32/25	410	32 kJ/m³	240	250	250