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The only way to do it, professionally, is DSC (Differential Scanning Calorimetry)

But what most of everybody does is a lot more simple.

Put a handful of PET flakes in an aluminum tray, put it in your kitchen oven (when your wife is not around) heat it up at 210° C for 20 minutes.

If you see black spots this is PVC.

If flakes only turn yellow, you still have glue.

If flakes remain clear you are in very good shape.

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Q: How do you calculate PVC ppm level in pet flakes?
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