Polyethylene terephthalate (PET), a collection made from ethylene. Commonly used as mineral water bottles, cola drinks bottles, juice bottles. It can only be due to heat 120 ℃, it is only suitable for cold and warm drinks, hot liquids or heating if the installation is deformed.
According to its composition, plastic cutlery can be divided into the following categories:
Plastic cutlery used as mineral water bottles, cola drinks bottles, juice bottles. It can only be due to heat 120 ℃, it is only suitable for cold and warm drinks, hot liquids or heating if the installation is deformed.
2.High-density polyethylene (HDPE), suitable for loading food and pharmaceutical bottles, cleaning supplies loaded and bath products, shopping bags, trash.
3.Polyvinyl chloride (PVC), vinyl chloride polymerization. And in contact with high-temperature grease PVC easy to release phthalates and toxic incompletely polymerized vinyl chloride monomer. PVC cling film made of good transparency, easy to break, strong adhesion, low price, very firmly stuck on the film we supermarkets, hypermarkets see box is it. By their nature, it applies only to frozen fresh vegetables, fruit, and should not put meat, cakes and other foods containing more fat, but also not be used for microwave heating.
4.Low density polyethylene (LDPE) plastic film and plastic wrap, for good water-barrier properties, so made of paper milk cartons, drink boxes and other packaging are using it as an internal foil. Because of low density polyethylene plastic wrap exceeds 120 ℃, there will be hot-melt, so if the use of the plastic wrap food heating, food grease in plastic wrap will melt some of the ingredients out, therefore, to be the first into the microwave oven before preservation membrane removed, at least not let the food in direct contact with plastic wrap. Low-density polyethylene per se does not have degradation, today's "plastic limit" major limitation is that it.
5.Polypropylene (PP), by the polymerization of propylene, polyethylene transparency are more better, harder than polyethylene, the restaurant is packed with most of its box, made of plastic box can be put into the microwave.
6.Polystyrene (PS), styrene polymerization, commonly used as a bowl of instant noodles in boxes, snack. It is heat and cold, but the temperature is too high will release harmful substances, so do not put instant noodles bowl into the microwave oven heating, and try not to use it to install hot food, but also can not bloom strong acid (juice) and strong alkaline substances, otherwise it will release styrene and auxiliary materials.
7.Polycarbonate (PC), which is bisphenol A and diphenyl carbonate was synthesized, with excellent toughness and mechanical strength, and good transparency, it is known as "transparent metal." Commonly used in the manufacture of water bottles, cups, bottles and so on. PC in the production process, the feedstock bisphenol A should become fully plastic structural components should not be released, in use, but in fact often do, there will be a small part of bisphenol A was not able to complete conversion to plastic, when heated It is released into the food product. Bisphenol A is an endocrine disruptor, the developing fetus and children particularly harmful, can cause miscarriage, congenital mental retardation and infant mental development retardation. Some studies have also confirmed that bisphenol A can interfere, antagonism and inhibition of thyroid hormone secretion of testosterone, affecting boys sexual development, hinder the formation of sperm, which may affect fertility. Therefore, use caution, including baby bottles made of polycarbonate, so as not to cause harm to the baby's sexual development.
In addition, none of the above seven kinds of melamine plastic plastic column also the majority of residents and restaurants, canteens of cutlery common, it is a thermosetting plastic, commonly used in the manufacture of bowls, plates, chopsticks, spoons and other food utensils. It melamine formaldehyde resin as the main raw material, adding an appropriate amount of cellulose filler and a coloring agent supporting material. Its look and feel, such as porcelain, acid and alkali resistance, impact strength and surface hardness are high, long life, it can be cleaned in the dishwasher the following 120 ℃, disinfection. The same size and thickness of tableware, melamine tableware porcelain tableware than light, but not as easily broken porcelain, therefore, especially by infants parents. Due to the special nature of melamine plastic molecular structure, it is not suitable for use in a microwave oven, it will be very easy to crack. Melamine tableware melamine, if not completely polymerized, will melt out to some foods.The market has been seized with a urea-formaldehyde resin or a phenolic resin "melamine tableware", and its shape is very similar to the authentic melamine tableware, most people can not easily identify, but high in formaldehyde, in particular, by heating, or storage " after hot "foods more precipitation, so it should go to regular stores to buy authentic factory production of melamine tableware.