How to distinguish between PET and PVC

How to distinguish between PET and PVC

Can be distinguished by combustion

Polyvinyl chloride (PVC). Appearance: transparent to opaque, hard. Softening or melting temperature range: 75~90°C; burning flame state: white smoke and pungent sourness on yellow and green; after fire: extinguished from fire. Become brittle after burning

Polypropylene and polyethylene (PP and PE), Appearance: Translucent to opaque, transparent film. Flammability: flammable in flames. Slowly extinguish or continue to burn after leaving the flame. When burning, the upper end of the flame is yellow, and the lower end is blue; there is melting and dripping. Can smell the paraffin.

Polyester resin (PET), appearance: transparent. Flammability: flammable, leaving the flame to continue burning. Near flame is melted, melted, leaving flame to continue burning, a few have smoke, very weak sweetness, ash is hard round, black or light brown.