Polyvinyl chloride (PVC). Appearance: transparent to opaque, hard. Softening or melting temperature range: 75 ~ 90 ℃ ° C； Burning flame state: yellow on the top and green on the bottom, with white smoke and irritating acid smell; Situation after leaving the fire: it goes out after leaving the fire. Embrittlement after combustion

Polyester resin (PET), appearance: transparent. Flammability: it is inflammable and continues to burn away from the flame. Near flame is melting shrinkage, melting burning, leaving the flame can continue to burn, a few smoke, very weak sweet, ash hard round, black or light brown.

Polycarbonate (PC), appearance: transparent to opaque, hard.

Flammability: refractory. In the flame, there are many black smoke, bright, carbonization and foaming phenomena; You can smell phenol