How to identify whether stretch film is toxic

First, a simple way is to "smell", stretch film environmental protection, non-toxic and tasteless, if there is a peculiar smell is mostly toxic, such as a very strong plastic smell (and may be the smell of additives).
Second, we can take some film, clamp it on the alcohol lamp with tweezers and ignite it, and then extinguish; Secondly, you can look at the difficulty of extinguishing, the condition after leaving the fire, the flame and smoke, the scene when extinguished and the breath recovered, etc., and the comprehensive judgment can be used to know what kind of plastic, stretch film will mainly be made of polypropylene plastic, polyethylene plastic, polyvinyl chloride material.
1. If it is polypropylene plastic: flammable, after ignition from the fire, the flame and smoke color are orange-yellow, and there are continuous drops of solvents during burning, and there is oil smell.
2. If it is polyethylene plastic: combustible, ignition after fire, flame and smoke-colored blue top yellow, molten matter dripping when burning, recover paraffin breath.
3. If it is polyvinyl chloride plastic: non-flammable, extinguished from the fire, the flame and smoke color are green at the bottom, the tip is yellow, and there is a comforting smell of hydrochloric acid gas after the fire is extinguished.