Plastic has good thermal and electrical conductivity, is easily processed, and cheap, so it has been widely used in many fields of electromagnetic components as a substitute for metal. But as modern society becomes highly advanced to bring out many kinds of electronics and frequent use of them, its demerits is to be increasingly exposed. That is, nonconductive plastic cannot absorb or block the not-required electromagnetic energy, so it may cause the malfunction or noise from the interference caused by outer electromagnetic wave, and also give harmful effects on human body. Moreover there are cases to be damaged advanced components by dust due to static electricity discharge.

In particular, as it becomes frequent that the malfunction of electric controller of communication device resulting from electromagnetic interference (EMI), the interest for the plastic which can block this electromagnetic wave becomes raised. And it has already been started the restriction for equipping some extents shielding capacity for commercial and residential electronics in Korea as well as advanced countries.