The rate of agitation and the amount of suspension stabilizer and crosslinking agent have great effects on the average diameter and water-absorbency.

The effects of the dispersing medium, the agitation intensity, the amount and properties of magnetic particles on the polymerization and magnetic content in the polymer microspheres are discussed.

Sealing aperture coating: Rongyang middle coating with suitable amount of quartz powder is used and constructed by shaving after even agitation.