The simplest method of identification of plastics is the combustion identification method. The following are the burning characteristics of several plastics. You can hold a small piece of plastic with tweezers and observe the burning characteristics after ignition.
Polyethylene: It is easy to burn and continues to burn after the fire. The flame has a yellow upper end and a blue lower end. It has a molten dripping phenomenon and a paraffin burning smell.
Polypropylene: easy to burn, continue to burn after the fire, the flame is yellow at the upper end, blue at the lower end, a small amount of black smoke, there is a phenomenon of melting and dripping and a petroleum smell.
Polyvinyl chloride: difficult to burn, extinguished after the fire, the flame is yellow at the upper end, green at the lower end, white smoke, soft surface and pungent sour taste.
Polystyrene: easy to burn, continue to burn after the fire, the flame is orange-yellow, thick black smoke carbon bundle, softening, foaming and special styrene monomer smell.
Organic combustion, easy to burn, continue to burn after the fire, the flame is light blue, the top is white, softened, foaming and has strong floral and fruity smell and rotten vegetable smell.