Every plastic product usually has a triangle sign at the bottom, which is equivalent to the product's "ID card". There are 1~7 numbers in the triangle. Each number represents a plastic container. They are made of different materials, so their uses and taboos are different.
Extended data:
PP (polypropylene) is used to make food containers such as buckets, trash cans, baskets, baskets and microwave ovens. The plastic container made of this material has good air permeability, high heat resistance, strong impact resistance, strong mechanical properties and resistance to various organic solvents and acid and alkali corrosion. Ordinary soybean milk bottle, sour milk bottle, fruit juice bottle, microwave lunch box. With a melting point as high as167 C, it is the only plastic box that can be put into a microwave oven and can be reused after careful cleaning. It should be noted that some microwave lunch boxes, the box body is No.5 PP, but the lid is No.4 PE. Because PE can't withstand high temperature, it can't be put in the microwave with the box. )