Buying Guides

A reference density chart for common recycling plastics — PP, PE, PET, PVC, PS, ABS, and more — with each resin's density in g/cm³ and whether it floats or sinks in water. Includes how fillers shift density, why some resins overlap, and how recyclers use the chart to sort plastic by sink-float.

Every plastic sorting method works on one physical property — density, weight, surface charge, conductivity, or polymer fingerprint. This guide compares sink-float, air classification, electrostatic, eddy-current, and NIR sorting, shows what each one separates, and gives a decision framework for matching the method to your contamination.

A centrifugal dryer spins washed plastic flake at high speed to throw off free surface water mechanically, before any heat is applied. This guide explains how a centrifugal drying machine works, where it sits in a wash line, the residual moisture it reaches, how to size one for film versus rigid flake, and when you still need a thermal stage after it.

EPS foam is almost all air, so the cost of recycling it is the cost of moving that air. This guide explains why expanded polystyrene is hard to recycle, how cold-press and hot-melt densifiers shrink it 40 to 90 times, what the compacted blocks are worth, and how to choose the right machine for your volume.

WEEE plastic is mostly valuable ABS and HIPS — until rubber feet, silicone keypads and elastomer gaskets drag it down to mixed scrap. This guide shows where elastic contamination fits among the other WEEE challenges, and how recyclers strip it out to sell prime single-resin flake.

Three separation methods can pull rubber and silicone out of plastic regrind — density sorting, electrostatic separation, and friction-elasticity separation. They are not interchangeable. This guide compares what each one actually removes, where each fails, and how recyclers combine them to hit a clean single-resin flake.