Machining and tolerances
Ceramic magnets are very hard and brittle, consequently machining must be done with a diamond wheel, and is easier when done prior to magnetization. Standard tolerances for ceramic magnet dimensions are +/-.005″ for ground dimensions and +/- 2% of feature size for dimensions. Because of their brittleness these magnets will not withstand impact or flexing. We recommend that they not be used for structural purposes.Ceramic magnets are chemically inert non-conductors, which is a benefit in many applications according to different grade as below
Temperature constraints and methods of magnetization
Maximum operating temperature for a ceramic magnet is 250°C. Although you will experience magnetic losses when operating at elevated temperatures, the losses are recovered when the material is brought down to normal ambient temperature. However, operating in very cold temperatures (-20°C) can result in permanent losses of magnetic strength unless the circuit has been designed for such extremes.