There is a five in the middle of the triangle composed of three arrows under the plastic bowl. What does this mean? What numbers can be used in the microwave oven?

The number "5" is polypropylene, or PP.

One is to make containers. PP is made of different materials. PP can be put into a plastic container in a microwave oven. It can be reused as a storage container, and can store food, oil and condiments.

The second is packaging film, which has unstretched and biaxial stretching. Untretched polypropylene (CPP) is often used in the packaging of snacks, bread, fruits, etc. Biaxially oriented polypropylene (BOPP) is a flexible packaging material comparable to cellophane.

Extended data:

superiority

1, most plastics have strong corrosion resistance and do not react with acid and alkali.

2, the plastic manufacturing cost is low.

3. Durable, waterproof and light.

It is easy to be shaped into different shapes.

5. It is a good insulator.

6. Plastics can be used to prepare fuel oil and gas, which can reduce the consumption of crude oil.

disadvantaged

1, recycling waste plastics is difficult and uneconomical.

2, plastic is easy to burn, and toxic gases are generated when burning. For example, when polystyrene burns, it will produce toluene, and a small amount will lead to blindness, and inhalation will vomit. The combustion of PVC will also produce toxic gas hydrogen chloride. In addition to combustion, it is a high temperature environment, which will lead to the decomposition of toxic components such as benzene rings.

3. Plastics are products extracted from petroleum, and petroleum resources are limited.

4. Plastics can't decompose naturally.

Baidu encyclopedia-plastic products