We all know that only food-grade plastic can be used for food packaging. Some people pack food from outside restaurants, found that the bottom of the disposable lunch box written "pp plastic" title, the network query pp is polypropylene, then, polypropylene is food-grade plastic?

Polypropylene abbreviated PP, it is food-grade plastic, can be in contact with food. We usually see the microwave oven lunch box, is made of polypropylene plastic, it has the effect of high temperature resistance, up to 130 ℃ can withstand high temperatures, conducive to people to heat the food.

Polypropylene is a non-toxic, harmless, odorless, heat-resistant, high hardness, low density plastic, it can be in contact with acid and alkali substances, will not deteriorate, chemical properties are more stable, it is because of this polypropylene in the food tableware has been widely used. However, polypropylene is not resistant to low temperatures, it is easy to become brittle at low temperatures, easy to aging, not wear-resistant, etc., also has many disadvantages.

Worth noting for consumers, many businesses in order to save costs, in the production of microwave oven lunch boxes, box body made of polypropylene material, but the box lid is made of PS (polystyrene). PS is not resistant to high temperatures, which can not enter the microwave oven to heat up, but the transparency of the higher, so that people can see at a glance in the lunch box of the food. So when you buy a microwave lunch box, if you find the lid is PS, remember not to put the lid into the microwave oven to heat.