Sensory testing method: non-toxic plastic bags are milky white, translucent, or colorless and transparent, flexible, lubricating when touched, and the surface seems to be waxy; toxic plastic bags are cloudy or light yellow in color, and feel sticky .
Water testing method: Put the plastic bag in the water and press it into the bottom of the water. The non-toxic plastic bag has a small specific gravity and can surface. The toxic plastic bag has a large specific gravity and sinks.
Shake detection method: grab one end of the plastic bag with your hand and shake it vigorously, making a crisp sound that is non-toxic; the sound is dull and poisonous.
Fire detection method: non-toxic polyethylene plastic bags are flammable, the flame is blue, the upper end is yellow, and they drip like candle tears when burning, have a paraffin smell, and emit less smoke; toxic PVC plastic bags are not flammable. It goes out immediately after leaving the fire, the flame is yellow, and the bottom is green, softening and drawing, giving off a pungent taste of hydrochloric acid.
Plastic bags are ubiquitous in our lives. Many restaurants like to use plastic bags to pack food. Such an approach is unsanitary and unscientific. Plastic bags should not be directly filled with hot or oily food. If you are not sure whether the plastic bag is safe, avoiding using it to hold overheated or oily food is one of the ways to reduce the hazard. Unsafe plastic bags mainly contain harmful substances such as dyes and heavy metals. The oil contained in oily foods such as meat, fish, and fried dough sticks is actually a kind of solvent, which can precipitate harmful substances in plastic bags; while high temperature will soften the plastic, which can also promote the precipitation of harmful substances, leading to poisoning. Therefore, it is safer to store vegetables or frozen food at room temperature. Of course, you should try not to use plastic bags to store food. You can bring your own basket or cloth bag when buying vegetables. When you have to use it, you should also take out the food in the plastic bag as soon as possible after returning home.
All plastic packaging bags produced by Shanghai Yifu Packaging Products Group Company use food-grade raw materials. We guarantee that the bags produced are safe, hygienic, healthy, environmentally friendly and recyclable.