Core tip: How to distinguish between non-toxic and toxic plastic film?

Commonly used identification methods include sensory inspection, combustion method and water immersion method, etc.

How to distinguish between non-toxic and toxic plastic film? The most commonly used identification methods include sensory inspection, burning method and water immersion method, etc.

Sensory inspection: Polyethylene and polypropylene have better transparency than PVC films, with a waxy luster on the surface, and a lubricating feeling when touched by hand, while PVC is milky white with poor transparency and sticky touch. Dark color, poor perception

Combustion identification method: polyethylene, easy to ignite, the flame is divided into two colors, the top is yellow, the bottom flame is blue, waxy, smokeless, and can continue to burn away from the open flame; polypropylene is different from polyethylene, but has a small amount of black Smoke, smells of oil. The toxic PVC is difficult to ignite. The flame is also divided into two colors. The upper part is yellow and the lower part is green. The flame is spray-like, emitting white smoke, and has a pungent pungent smell. It will go out when you leave the open flame. Because of PVC The film is toxic and should not be burned in the kitchen to avoid air pollution

Water immersion identification method: This method is simple and practical. Dip the plastic bag into the water, press it into the water with your hand, and let go. G such as sinking in the water are generally toxic, and those that can float on the surface are generally non-toxic. of