Item No.: Y22H-Ferrite-2  
Magnet Shape: Ring / Tube          
Material: Hard Ferrite (Ceramic)
Composite:      Fe2O3 (BaCo3 or SrO3), Fe3O4 (SrCo3, SiO2) 
Type: anisotropic or isotropic
Style:         Sintered Permanent Magnet
Grade(China Stardard):        Y22H  
Detailed magnetic properties data:
Residual Magnetic Flux Density (Br): 3.1-3.6 KGs (mT):  310-360 mT
Intrinsic Coercivity Force (Hcj):    2.77-3.14 KOe    220-250 KA/m
Coercivity Force (Hcb):              3.51-4.02 KOe    280-320 KA/m
Energy Density (BH)max:              2.5-3.0 MGOe     20.0-24.0 KJ/m³
Operating Temperature:               -40 °C to +250 °C
Magnetisation Direction: Axial / Radially magnetized
Size Can be customized according to customer drawings:
Tolerance:         +/-2% mm
Delivery time           7-25 days
Hard ferrite magnets,  made by molding powder mixture of about 80% Fe2O3 and about 20% either BaCo3 or SrO3, is also called ceramic magnet. Along with deepening of research, some additives such as cobalt (Co) and lanthanum (La) are mixed together to improve the magnetic performance. The molded powder metallic green is sintered inside a temperature controlled furnace what is heated with electricity or coal. Though hard ferrite magnet is with low magnetic property, it is still a preferable choice to engineer in their design due to several factors: abundantly available raw material,the cheapest cost among permanent magnet family, low density, excellent stability of chemistry, high maximum working temperature and Curie temperature.