Numbers At The Bottom Of Plastic Products
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Plastics can be seen everywhere in our lives. Plastic products are made of different materials, with different materials and different applications. The numbers on the bottom of the plastic bottles represent different materials.
The number "1" stands for polyethylene terephthalate, or PET. Mainly used for mineral water bottles, carbonic acid, fruit juice beverage bottles and soy sauce vinegar bottles. The heat-resistant temperature of the PET bottle is 70 degrees Celsius, and it is only suitable for warm or frozen drinks.
The number "2" stands for high density polyethylene, or HDPE. HDPE and other plastics are made into composite films, and are also used in aquatic products.
The number "3" stands for polyvinyl chloride, or PVC, which is also used to make IV bags and disposable sterile infusion sets because of its low price. However, long-term use can lead to the accumulation of harmful substances DEHP. Therefore, from the perspective of safety, it is the future trend for the pharmaceutical industry to choose non-PVC materials.
The number "4" is low density polyethylene, or LDPE. No. 4 plastic is used in large quantities for packaging. LDPE is mainly used in the production of food wraps and plastic bags for food.
The number "5" is polypropylene, or PP. One is the container. PP is different from its material. PP can be put into a plastic container in a microwave oven, and it is a plastic container that can be used repeatedly. It can be used as a storage container to store food, oil and condiments. The second is the packaging film, which is unstretched and biaxially stretched. Unstretched polypropylene (CPP) is often used in the packaging of snacks, bread, fruits, etc.; biaxially oriented polypropylene (BOPP) is a flexible packaging material comparable to cellophane.
The number "6" is polystyrene, or PS. PS is mainly processed into film and foam plastic in packaging. Films are used for the packaging of fruits and vegetables; foamed plastics are mostly used for bowls of instant noodle boxes and fast food boxes, etc., but they are not resistant to high temperatures, so they cannot be heated directly in a microwave oven to avoid the release of toxic chemicals due to excessive temperature.
The number "7" is polycarbonate, i.e. PC or other plastic. A plastic container made of PC material may release toxic bisphenol A. The higher the temperature, the more the release and the faster the speed. Therefore, do not heat it or expose it to direct sunlight.
