Item No.: Y28H-Ferrite-4  
Magnet Shape: arc / segment          
Material: Hard Ferrite (Ceramic)
Composite:      Fe2O3 (BaCo3 or SrO3), Fe3O4 (SrCo3, SiO2) 
Type: anisotropic or isotropic
Style:         Sintered Permanent Magnet
Grade(Chinese Stardard):         Y28H
Detailed magnetic properties data:
Residual Magnetic Flux Density (Br): 3.8-4.0 KGs (mT):  380-400 mT
Intrinsic Coercivity Force (Hcj):    3.01-3.27 KOe    240-260 KA/m
Coercivity Force (Hcb):              3.14-3.52 KOe    250-280 KA/m
Energy Density (BH)max:              3.3-3.8 MGOe     27.0-30.0 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
Basic Characteristics about Ceramic Magnets
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.