Subject of this article:pePlastic bags are food grade.pei.e. polyethylene,pePlastic bags are food grade.peIt is a thermoplastic resin made of ethylene after polymerization. It is odorless and non-toxic, and has very good low temperature resistance (minimum operating temperature-100~70℃), and good chemical stability, acid and alkali resistance, insoluble in common solvents at room temperature, excellent electrical insulation, low water absorption.pePlastic properties and purchase considerationsAccording to its polymerization method, molecular weight, and chain structure, polyethylene can be divided into three types: high-density polyethylene, low-density polyethylene, and linear low-density polyethylene. There is also a certain gap in the performance and use of these three polyethylenes, and you must carefully distinguish them when purchasing.pePlastic is widely used in daily life, I believe everyone has a certain understanding of it. Food grade plastic bags are generallypeorppMade, and, regular food-grade plastic bags will haveQSCertification mark, if you do not see this mark when purchasing, please purchase carefully, so as not to buy fake products and endanger the health of yourself and your family.Related article recommendation: Can plastic food bags be put in the refrigerator?How to distinguish food grade plastic bags?1, After taking out a roll of food-grade roll bags, you can first see whether it is made of brand-new materials according to the packaging. Generally, all the materials used for food are brand-new materials, and recycled materials cannot be used in food-grade packaging.2, Secondly, the color of the food-grade bag is translucent, without fogging, and the bag is clean and transparent. Bags made with recycled materials will appear foggy with impurities.3, Food-grade bags have good toughness during use and will not be torn easily. Bags of unqualified quality are prone to breakage during use.4, Finally, the food-grade packaging bag smells no peculiar smell, while the packaging bag with recycled materials smells pungent.What are the general characteristics of food-grade plastic bags?Food-grade plastic bags are generally divided into ordinary food packaging bags, vacuum food packaging bags, inflatable food packaging bags, boiled food packaging bags, steamed food packaging bags and functional food packaging bags, etc. Grade plastic bag materials are:PE(polyethylene), aluminum foil, nylon and composite materials. In order to ensure the freshness of food and no rot, food-grade plastic bags have some common characteristics regardless of category and material. First, they are required to completely block organic solvents, oils, gases, and water vapor; second, they have excellent permeability, Moisture-proof, cold-resistant, heat-resistant, light-proof and insulating, and has a beautiful appearance; third, it is easy to form and low processing cost; fourth, it has good strength, and the strength per unit weight of plastic packaging bags is high. Impact resistance, easy to modify.In addition to the above characteristics, for consumers of edible products, food-grade plastic bags also have some characteristics that come from rigid requirements. For the special needs in the actual production process, the content of chemical substances is within the standard range allowed by the country, and the chemical stability is strong; food-grade plastic bags sometimes have corresponding functions of anti-corrosion, anti-rust and anti-electromagnetic radiation, ensuring from all angles Food safety and hygiene.