For PP, PE, PET mixed crushed material, you can put it into the pool first, because PET density is the largest, its relative density is 1.30--1.38, then PET will sink. Then, start pouring alcohol into the pool to 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 was used to separate the PP, PE, and PET mixtures.
The density of PP is from 0.89 to 0.91, the density of PE is from 0.91 to 0.965, and the density of PET is from 1.30 to 1.38.
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