Item No.: Y23-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):        Y23   
Detailed magnetic properties data:
Residual Magnetic Flux Density (Br): 3.2-3.7 KGs (mT):  320-370 mT
Intrinsic Coercivity Force (Hcj):    2.14-2.38 KOe    170-190 KA/m
Coercivity Force (Hcb):              2.39-2.89 KOe    190-230 KA/m
Energy Density (BH)max:              2.5-3.2 MGOe     20.0-25.5 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 magnets are susceptible to demagnetization when exposed to temperature extremes. Their thermal stability is the poorest of all the magnetic families, but they may be utilized in environments up to 300°C (570°F). There are grades which have better resistance to high and low temperatures, but several factors will dictate the performance of the Neodymium magnet. Magnetic geometries utilizing backing plates, yokes, or return path structures will respond better to temperature changes. As with most ceramic, the ferrite magnets should not be exposed to heating or cooling rates greater than 200°F per hour.
Ceramic magnets are very resistant to corrosion. Coatings can be applied for cosmetic reasons or to reduce the fine, ferrite powder which is associated with ceramic (ferrite) magnets.