People are used to wrapping all kinds of food in plastic wrap. When the dishes need to be heated, they are afraid of spilling oil. They also wrap a layer of plastic wrap and put them in the microwave to reheat. Indeed, plastic wrap has gradually become an indispensable commodity in people's daily life. But, do you know, what material is this thin plastic wrap?
At present, most of the cling film sold on the market, like the commonly used plastic bags, are made of ethylene masterbatch. Some plastic wrap materials are polyethylene (referred to as PE), which does not contain plasticizers and is relatively safe to use; some materials are polyvinyl chloride (referred to as PVC), which often add stabilizers and lubricants , Auxiliary processing agents and other raw materials are harmful to the human body.
How to distinguish PE and PVC cling film?
1. To the naked eye: PE material has poor transparency, and the color is whitish, and the covered food looks blurry; PVC material has good gloss and looks clear and transparent, because of the plasticizer, it is a little light to light yellow.
2. By hand: PE material is relatively soft, but has poor toughness, and can break after stretching; PVC material has strong toughness, can be greatly stretched and elongated without breaking, and it is easy to stick to the hand.
3. Burning with fire: After the PE cling film is ignited with fire, the flame is yellow and burns quickly, with the smell of candle burning; while the flame of the PVC cling film is ignited yellow-green, without dripping oil, it will be extinguished if it leaves the fire source, and it is strong Pungent smell.
4. Water immersion: Because the density of the two is different, the density of PE cling film is lower than that of water, and it will float up after being immersed in water; while the density of PVC cling film is higher than water, and it will sink when immersed in water.
People must carefully look at the material on the product label when buying plastic wrap. The relative material of PE material is pure, safe and non-toxic. When buying, go to a regular store to buy products from regular manufacturers. When using, pay attention to the temperature that the cling film can withstand, and heat it according to the temperature marked on the brand, so as to prevent the inferior cling film from becoming soft when heated and causing harm to human health.
