1.High-density polyethylene (HDPE), suitable for bottles containing food and medicine, cleaning products and bath products, Plastic tray, garbage cans.
2. Polyvinyl chloride (PVC), which is polymerized from vinyl chloride. High temperatures and contact with grease PVC plastics are prone to release phthalates and incomplete polymerization of toxic vinyl chloride monomers. The plastic wrap made of polyvinyl chloride has good transparency, is not easy to break, has strong adhesion, and has a low price, and the film that we see firmly on the box in supermarkets and hypermarkets is it. According to its characteristics, it is only suitable for the refrigeration and preservation of vegetables and fruits, and should not be put in meat, cakes and other foods containing more fat, nor should it be used as microwave heating.
3. Low-density polyethylene (LDPE) plastic film and plastic wrap have good water barrier performance, so milk cartons, beverage cartons and other packaging boxes made of paper use it as an inner film. Because low-density polyethylene plastic wrap will dissolve hot at more than 120 °C, if the plastic wrap is used to wrap the food for heating, the fat in the food will melt out some of the components in the plastic wrap, so the plastic wrap needs to be removed before entering the microwave, at least not the food directly contact the plastic wrap. Low-density polyethylene itself does not have degrading properties, and the main limitation of today's "plastic restriction order" is it.
4, polypropylene (PP), made of propylene polymerization, transparency is also better than polyethylene, harder than polyethylene, most of the boxes used in the hotel are it, the plastic box made can be put into the microwave oven for heating.
5. Polystyrene (PS), made of styrene polymerization, is often used in bowled instant noodle boxes and fast food boxes. It is heat-resistant and cold-resistant, but too high a temperature will release harmful substances, so do not put the bowl of instant noodles in the microwave to heat, and try not to use it to pack piping hot food, and also can not contain strong acidity (if juice) and strong alkaline substances, otherwise it will release styrene and auxiliary materials.
6, polycarbonate (PC), it is synthesized with bisphenol A and diphenyl carbonate as raw materials, has excellent impact toughness and mechanical strength, and good transparency, so it is known as "transparent metal". It is often used in the manufacture of kettles, drinking cups, feeding bottles, etc. In the process of making PC, the raw material bisphenol A should be completely become a plastic structural component, should not be released in use, but in fact often cannot, there will be a small part of bisphenol A can not be completely converted into plastic, heat will be released into food. Bisphenol A is an endocrine disruptor that is particularly harmful to the developing fetus and children, and may cause miscarriage, congenital intellectual disability, and mental retardation in infants and young children. Some studies have also confirmed that bisphenol A can interfere with and antagonize thyroxine and inhibit the secretion of testosterone, affect the sexual development of boys, hinder the formation of sperm, and may affect fertility. Therefore, extra care should be taken in use, including bottles made of polycarbonate, to avoid harm to the baby's sexual development.
