Commonly used plastic bags of food, mostly made of polyethylene film, the film non-toxic, it can be used to hold food. There is also a film made of polyvinyl chloride, PVC itself is not toxic, but the film based on the use of the additive added is often harmful substances, has some toxicity. So this kind of film, and the film made from the plastic bags are not suitable for holding food. If you want to identify PVC and polyethylene plastic bags, a simple method of identification is available below. 1. The polyethylene film (non-toxic) film is milky white, translucent (several stacked observation is particularly evident), feels relatively smooth, as if coated with a layer of wax on the surface, hard shake, the sound crisp, fire flammable, yellow flame, burning mucus dripping, and when the smell of candles burning. 2. PVC film (generally toxic) does not add pigment, is transparent, the surface feels somewhat tacky, forced jitter, low voice, easy to burn a fire from the flame is put out, the flame was green. 

palabras clave: Plastic bags, food bags, plastic bags Guiyang,