Origin of Material Identification Code / 材質辨識碼由來

The “plastic material recycle identification code” of ROC was quoted from the Resin identification code developed by the Society of the Plastics Industry of USA in 1988 which serves now as the conventional international identification code. The plastic identification code includes three clockwise arrows, forming a circular shaped triangle, and encompassing the code inside it (as shown in the diagram), separately marked from No. 1 through No. 7, representing seven kinds of different.