For PP, PE, PET mixed pulverized material, it can be placed in the pool first. Since PET has the highest density and its relative density is 1.30--1.38, PET will sink. Then, start pouring alcohol into the pool, neutralize the density of the water, and adjust the density to 0.91. When the PE in the water sinks, it is adjusted.
The density method is used to separate the PP, PE, and PET mixtures.
The density of PP is 0.89--0.91, the density of PE is 0.91---0.965, and the density of PET is 1.30--1.38.
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