Item No.: Y25-Ferrite-1  
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):        Y25   
Detailed magnetic properties data:
Residual Magnetic Flux Density (Br): 3.6-4.0 KGs (mT):  360-400 mT
Intrinsic Coercivity Force (Hcj):    1.70-2.14 KOe    135-170 KA/m
Coercivity Force (Hcb):              1.76-2.51 KOe    140-200 KA/m
Energy Density (BH)max:              2.8-3.5 MGOe     22.5-28.0 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
Ceramic (Ferrite) Magnets are produced by calcining a mixture of iron oxide and strontium carbonate to form a metallic oxide. A multiple stage milling operation reduces the calcined material to a small particle size. The powder is then compacted in a die by one of two methods. In the first method, the powder is compacted dry which develops an isotropic magnet with weaker magnetic properties, but with better dimensional tolerances. Often times a dry pressed magnet does not require finish grinding. In the second method, the powder is mixed with water to form slurry. The slurry is compacted in a die in the presence of a magnetic field. The applied field creates an anisotropic magnet which exhibits superior magnetic properties, but usually requires finish grinding.