There are many kinds of commonly used raw materials for plastic bottles, each with its own characteristics. How to distinguish them:
Polytetrafluoroethylene (PTFE): translucent to opaque, easy to bend, and elastic. Non-flammable. There is a pungent smell (HF) when it is hot.
Polyamide (PA): translucent to opaque. Difficult to burn, and it will go out immediately after leaving the flame. When burning in the flame, there is blue smoke, and the upper end is orange-red; there are melting, dripping, and bubbling phenomena; you can smell the smell of burning wool.
Polycarbonate (PC): transparent to opaque. Hard. Difficult to burn. Burning in the flame produces a lot of black smoke, bright, carbonization, and bubbling; you can smell the smell of phenol.
Phenolic resin (PF): (usually contains fillers) is dark in color. Difficult to burn. When burning in the flame, a bright yellow flame can be seen, with a lot of black smoke, cracking, and color deepening.
Polyvinyl chloride (PVC): transparent to opaque. Difficult to burn. It burns yellow in the flame, the edge of the flame is green, white smoke; there is softening. You can smell the smell of burning.
Amino resin (UF urea/formaldehyde; MF melamine/formaldehyde): (containing fillers) is hard. It is difficult to burn. It burns bright yellow in the flame; there are carbonization, expansion, and cracking phenomena. You can smell ammonia, formaldehyde, and fishy smells.
Polyethylene (PE): translucent to opaque, hard; transparent film. It is flammable in the flame, and it will slowly go out 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. You can smell the smell of paraffin.
Polypropylene (PP): translucent to opaque, hard; transparent film. It is flammable in the flame, and it will slowly go out 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. You can smell the smell of paraffin.
Polyoxymethylene (POM): It has a light blue flame when burning, and emits a formaldehyde smell. Its dripping materials will also burn, and the flame is not easy to extinguish. The burning place is the same color, and the specific gravity is 1.42.
Polybutylene terephthalate (PBT): It has a blue flame head and an orange-red flame when burning, and emits light black smoke and drips. The flame vibrates violently, and the specific gravity is 1.31.
Polystyrene (PS): It has an orange-yellow flame when burning, emits a lot of black smoke and is not easy to drip, and makes the air contain carbon, and the specific gravity is 1.04.
Acrylonitrile-butadiene-styrene copolymer (ABS): It has a yellow flame, black flame and is not easy to drip when burning, and the specific gravity is 1.05.
Polymethyl methacrylate (PMMA): It burns slowly with a yellow flame head and a blue bottom that will drip, and emits a fruity smell, and the specific gravity is 1.17-.2.
Polyvinyl acetate (EVA): When burning, it has a yellow flame head and a blue bottom that is easy to drip. The flame vibrates violently and emits a foul odor.
Polyurethane (PU): The yellow flame has a blue bottom that will drip, emits light black smoke, and goes out as soon as the flame leaves.
