The difference between polyvinyl chloride (PVC) and polyethylene (PE)
There are two common plastics: one is polyethylene film; the other is polyvinyl chloride film. Plastic bags made of polyethylene film are non-toxic and can be used to hold food, but they are less strong and cannot withstand 80 It is not suitable for long-term use of tea, spices, etc. Plastic bags made of polyvinyl chloride film are toxic and should not be in direct contact with food. PVC plastic is often used to make raincoats, shoe soles, bedspreads, curtains, tablecloths, handbags, etc. Simple methods to identify the above plastic bags: 1. Touch method: it feels lubricated by hand, and the surface is like a layer of wax (chemically called wax), which is a non-toxic polyethylene film; and polyvinyl chloride The film feels a little sticky to the touch. 2. Shaking method: The sound of shaking by hand is brittle, which is a non-toxic polyethylene film; the sound of shaking by hand is low, and it is a polyvinyl chloride film plastic bag. 3. Combustion method: it burns immediately when it encounters fire, the flame is yellow, and there are paraffin-like oil droplets dripping when burning. There is also the smell of candle burning. It is a non-toxic polyethylene film; if it is not easy to burn, it will be extinguished immediately after leaving the fire. Green is a polyvinyl chloride film plastic bag. 4. Water immersion method: Immerse the plastic bag in water, press it into the water by hand, and the non-toxic polyethylene film that can surface; the one that sinks to the bottom is the polyvinyl chloride film plastic bag. Polyethylene English abbreviation PE, it is a polymer of ethylene, non-toxic. Easy to color, good chemical stability, cold resistance, radiation resistance, good electrical insulation. It is suitable for packaging materials for food and medicine, making tableware, medical equipment, and insulating materials for the electronic industry. Polyvinyl chloride, referred to as PVC in English, is a polymer of vinyl chloride. It has good chemical stability and is resistant to acid, alkali and some chemicals. It is moisture-resistant, aging-resistant and flame-retardant. It should not be used above 60°C, and it will harden at low temperatures. Polyvinyl chloride is divided into soft plastics and hard plastics. The soft ones are mainly made into films, used as packaging materials, rainproof products, agricultural seedling raising films, etc., and can also be used as insulation layers for cables and wires, and artificial leather products. Hard ones are generally made into pipes and plates, pipes are used as water pipes and pipes for conveying corrosion-resistant fluids, and plates are used as linings and floors for various storage tanks.