Analysis of the correct use of plastic products

Analysis of the correct use of plastic products

Polyethylene products are used most in real life and have good chemical stability. At room temperature, you can use them without any special circumstances. Do not use it for long-term packaging of foods rich in fats. Do not store foods with a temperature higher than 60 °C for a long time. Do not pack or cover foods in a microwave oven.

Polypropylene products have good chemical stability, tensile strength and heat resistance better than polyethylene. At room temperature, there is no special case, you can use it with confidence. It is the only common plastic product that can hold food into the microwave oven. It can be used for a long time. Place hot foods, beverages, dairy products, and oily foods at temperatures below 80 °C. However, it cannot be heated on an open flame. Its disadvantage is that it has a poor barrier property, and it is not very effective to store foods that need to maintain flavor.

Polystyrene products have low hygroscopicity and good barrier properties at low temperatures. They are very suitable for low temperature food refrigeration, and are also resistant to xenon radiation sterilization. They can be used safely at normal temperature and without special circumstances. The disadvantage is that the resistance to hot water is poor, and the oil resistance is not very good. Do not use it in a place where the temperature is above 60 ° C for a long time to hold oily food, such as a foam plastic snack box.

Polyvinyl chloride products, PVC products for packaging, food and medicine, the raw materials used in production must be food grade PVC, in line with the national standard GB4803, mainly including vinyl chloride monomer residue ≤1.0mg/kg The additives used in it should also comply with the provisions of GB9685. Polyvinyl chloride products that meet the above food hygiene standards have some irreplaceable qualities, so they cannot be eliminated. For example, using PVC plastic wrap to refrigerate fresh meat and fish, not only can maintain the proper moisture of the food, but also maintain the appearance and color of fresh meat and fish. At normal temperature, it can be used in a wider range without special circumstances, especially for foods rich in fats. Be careful not to hold foods at 60 ° C or above, or heat them in a microwave oven. Do not use PVC products that are not packaged for food.

The above only describes the normal situation of producing qualified plastic products with qualified raw materials. The use of recycled plastics (ie, reprocessed waste plastics) and the production of plastic products by unqualified raw materials are not included, and the situation of contamination before use is not included.