3.2. The natural flotability of PVC plastics
The natural flotability of PVC plastics with additives are shownin Fig. 4a. It is obvious that the PVC plastics with DnOP serving asadditive possess good natural flotability, and the flotation recov-ery keeps constant, namely 100%, with increasing the amount ofDnOP. This is because PVC resin has superior natural flotability andFig