How to distinguish the numbers on plastic products
Plastic products generally have triangular cycle marks and numbers. Different plastic products have different numbers, so what are the differences between them? Let's learn together according to the "general knowledge on the use and purchase of plastic food related products" published on the website of the State Administration of market supervision.
The number 1 belongs to PET material
Polyethylene terephthalate is applied to the outer packaging of beverages such as soda, water and fruit juice. The product features high transparency, good barrier, heat resistance to about 70 ℃ and easy deformation. When in use, do not put it in the sun in the car, do not load hot drinks, wine, oil and other food, and do not recycle.
The number 2 is HDPE
That is, high-density polyethylene, which is applied to the outer packaging of milk, water, fruit juice and yogurt. The product is opaque, feels like wax, and has certain strength, toughness, moisture resistance and air permeability. When using, because it is difficult to clean, it is recommended not to recycle, which is easy to breed bacteria.
The number 3 is PVC
That is, PVC is applied to fresh-keeping film and other products. The products have certain strength, toughness, good plasticity and poor stability to light and heat. When using, use less or not for food packaging, do not recycle, and do not contact high-temperature and high-fat foods.
The number is 4, which is made of LDPE
That is, low-density polyethylene, which is applied to plastic bags, fresh-keeping films and other products. The products have good flexibility, extensibility, electrical insulation and transparency. Its chemical stability is good, but its heat resistance is poor. When using, do not use it in microwave oven because of its weak heat resistance.
The number 5 belongs to PP material
Polypropylene is applied to microwave oven lunch boxes, disposable lunch boxes, disposable water cups and other products. The products have chemical resistance, heat resistance, electrical insulation, good mechanical properties and wear resistance. PP material is the only plastic product that can be put into the microwave oven. The heat-resistant temperature is as high as 130 ℃, which can be reused after cleaning.
The number is 6, which belongs to PS material
Polystyrene, which is used in instant noodle boxes, fast food boxes and other products, has good insulation, corrosion resistance and transparency, easy to crack at low temperature and weak heat resistance. When using, do not put it into the microwave oven, and do not contain high-temperature, strong acid and strong alkaline food.
The number 7 belongs to other material
That is, all other resins and mixtures not listed are applied to products such as space cups, milk bottles and water cups, and their properties depend on what kind of resin they are made of. Such as polycarbonate (PC): colorless, transparent, heat-resistant and impact resistant. Polycarbonate (PC) products should not contain high heat food. If the container is cracked or damaged, it should be stopped immediately.