pet塑料可以长期用来装米、豆这类的食品，首先PET无毒，而且他的耐气候性都很好单单装装米和豆子完全没有问题。

市面常见的饮料塑料瓶都是PET材质的，属于安全材料。但是在储存过程中一定要避免高温，PET材料的塑料瓶一般可承受温度最高在100摄氏度，在100摄氏度以下对保存的食品是安全的，超过可能导致有害物质释放。

聚对苯二甲酸乙二醇酯就是PET，化学式为C10H8O4n，是由对苯二甲酸二甲酯与乙二醇酯交换或以对苯二甲酸与乙二醇酯化先合成对苯二甲酸双羟乙酯，然后再进行缩聚反应制得。

食品级的PET除了聚合过程中加入的微量催化剂和抗氧化剂以外，不会加入任何其他的助剂。使用过程中也不会发生助剂的迁移和渗出，因此就材料本身而言是安全的。

PET plastic can be used to hold food such as rice and beans for a long time. Firstly, pet is non-toxic, and its weather resistance is very good. There is no problem only holding rice and beans.

The common beverage plastic bottles in the market are made of pet, which belongs to safety materials. However, high temperature must be avoided in the storage process. Generally, plastic bottles made of PET materials can withstand a temperature of up to 100 ° C. below 100 ° C is safe for preserved food, which may lead to the release of harmful substances.

Polyethylene terephthalate is pet, with the chemical formula of c10h8o4n. It is prepared by exchanging dimethyl terephthalate with ethylene glycol or esterification of terephthalate with ethylene glycol to synthesize dihydroxyethyl terephthalate first, and then polycondensation.

Food grade PET will not add any other additives except micro catalysts and antioxidants added in the polymerization process. The migration and exudation of additives will not occur during use, so it is safe for the material itself.