What is the classification of plastic boxes?

Update:23-08-2018
Summary:

According to the different uses of materials, there are […]

According to the different uses of materials, there are professional signs on the plastic box to distinguish
1-PET polyethylene terephthalate: It can cause carcinogens after 10 months of use. This material

The quality of plastics is very high after being used. It is usually used as mineral water bottles and milk bottles. Not suitable for cold and overheated water, easy to precipitate carcinogen DEHP.
2-HDPE (High Density Polyethylene): It is not easy to clean and is easy to breed bacteria. It is not recommended for repeated use. Usually, cosmetic bottles and shower gel plastic bottles are suitable for this type of material.
3-PVC (polyvinyl chloride): It is easy to precipitate harmful substances in case of high temperature and oil, and is commonly used in raincoats, plastic toys, building materials, etc.
4-LDPE (Low Density Polyethylene): It is easy to produce harmful substances at high temperatures. Plastic bags and cling film commonly used in daily life are all such materials. Wrap the food with plastic wrap to easily dissolve harmful substances in the presence of grease.
5-PP (Polypropylene): The only material that can be used in microwave ovens for heating materials. It can be reused after careful cleaning, but the lid of the general microwave plastic box is not made of PP material, so it is recommended to remove the lid when heating.
6-PS (polystyrene): heat-resistant and cold-resistant, is the material for making bowls of instant noodles and foamed snack boxes. Can not be placed in the microwave, because the temperature is too high to produce chemicals, so we should reduce the use of fast food boxes to pack hot food.
7-AB (Acrylonitrile Butadiene): Cannot be used for food packaging, but before 2008, Code 7 mainly refers to all plastics except 1~6. Plastic labels for plastic bottles and water dispensers are usually '7'.
When using plastic packaging boxes, we should try to avoid high temperature, repeated use, etc., and hope to have more environmentally friendly plastic packaging boxes in the future.