PP plastic is an isotactic crystal with good thermal stability, but its material is brittle and easily broken, mainly polypropylene. The microwave lunch box is made of this material, which is resistant to high temperature 130℃ and has poor transparency. It is the only plastic box that can be put into the microwave oven and reused after careful cleaning. It should be noted that some microwave lunch boxes are made of PP 05, but the lid is PS 06. PS is generally transparent, but it is not resistant to high temperature, so it can't be put into the microwave oven with the box. To be on the safe side, open the lid before putting the container in the microwave oven.
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PV, also known as PVC, is a polyvinyl chloride resin, which is often used to make engineering profiles and daily-use plastic products, such as raincoats, building materials, plastic films, plastic boxes and so on. Good plasticity and low price. But it can only withstand the high temperature of 8 1℃. Plastic products made of this material are prone to produce toxic and harmful substances from two aspects, one is monomolecular vinyl chloride which is not fully polymerized in the production process, and the other is harmful substances in plasticizers. These two substances are easy to precipitate when they encounter high temperature and oil, and toxic substances are easy to cause cancer after entering the human body with food. At present, containers made of this material are rarely used for packaging food. Besides, don't let it get hot.
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PE is polyethylene. Plastic wrap and plastic film are both made of this material. Heat resistance is not strong. Usually, qualified PE plastic wrap will melt when the temperature exceeds 1 10℃, leaving some plastic preparations that cannot be decomposed by human body. Moreover, food is wrapped and heated with plastic wrap, and the oil in food can easily dissolve the harmful substances in plastic wrap. Therefore, before putting food into the microwave oven, you must first remove the wrapped plastic wrap.
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PET, namely polyethylene terephthalate, mineral water bottles and carbonated beverage bottles are all made of this material. Beverage bottles cannot be recycled with hot water. This material is heat-resistant to 70℃ and is only suitable for warm or frozen drinks. When filled with high-temperature liquid or heated, it is easy to deform, and some harmful substances are dissolved out.