The wear mass loss is high when the abrasive medium has high hardness, multilayer coating shows better wear properties than single-layer coating in the effect of biggish load.

Professor Lin told CNN: "the anti-reflective coating requires multi-layer coatings which are slightly more complex than the typical single-layer ones."

Radial lead coil, single or multi-layer winding on ferrite core, coating by epoxy resin. Products can be taped or packed in viny bangs.