According to the different uses of material is also different, the general plastic box for professional signs to distinguish

1-pet poly (ethylene terephthalate): 10 months will produce carcinogenic substances. This material is used for the use of plastic waste after a large probability, usually as a mineral water bottles, milk bottles and so on. Not suitable for cold and overheating water, easy to precipitate carcinogens DEHP.

2-HDPE (high-density polyethylene): Difficult to clean, easy to breed bacteria, do not recommend reuse. Usually cosmetic bottles, bath milk plastic bag rotary bottle belong to this kind of material.

3-PVC (polyvinyl chloride): High temperature and grease easily precipitate harmful substances, commonly used in raincoats, plastic toys, building materials and so on.