This Korean Industrial Standard specifies multilayer printed wiring boards (hereafter referred to as
"printed boards") used mainly for electrical apparatus. But it is not applicable for multilayer flexible
printed wiring boards, multilayer flex rigid printed wiring boards, and metal core printed wiring boards.
Remark 1. The classifying symbols used in this standard are not indicating grades but simply
classifications. 2. The units and numerical values given in { } in this standard are based on the traditional units, and are appended for informative reference.