Sergey Bylikin, Gary Horner and, Brian Murphy Solutions for Chapter: Materials, Exercise 12: Questions

Outline why is $\mathrm{PCB}$ considered “dioxin like”, but not a dioxin.

$\mathrm{LDPE}$ has a specific gravity of $0.92 \mathrm{g} {\mathrm{cm}}^{-3}$ and $\mathrm{HDPE}$ has a density of $0.95 \mathrm{g} {\mathrm{cm}}^{-3}$. Suggest a reason why flotation is not a good method of separating these two plastics.

Many plastic materials are disposed of by combustion. State two disadvantages of disposing of polyvinyl chloride in this way.

Identify two difficulties and two advantages in recycling plastics.