Polypropylene is non-toxic, odorless, low density, superior to low-pressure polyethylene in strength, stiffness and hardness, and can be used at around 100℃. Good dielectric properties, high-frequency insulation, not affected by humidity, but brittle at low temperature, not wear-resistant, easy to age. Common organic solvents such as acid and alkali have little effect on it and can be used for tableware.

Food-grade plastics cannot be accurately distinguished by their characteristics such as color, thickness, hardness and strength. The safest way is to read the label carefully, which not only indicates the words "for food contact" and "for food packaging", but also the name and contact information of the manufacturer and the plastic material.

Extended data

There are mainly two kinds of plastic bags for food in the market: one is common in small supermarkets, restaurants or vendors, who use white plastic bags as thin as almost transparent. The other is common in large supermarkets and restaurants, and the plastic bags they provide for vegetables, fruits or cooked food are thicker.

Plastic bags without any information are probably not food grade. This kind of plastic bag has potential food safety risks and cannot be used to hold food. Because it may contain residual microorganisms that exceed the national standards or additives that are not allowed to be used in the national standards may be added during processing, which is harmful to human body.

If you are worried that the seller's plastic bags are not regular, you can bring your own food-grade plastic bags or polypropylene (PP) crisper when shopping, which is safe and environmentally friendly.

Baidu encyclopedia-polypropylene

People's Network-Use less plastic bags for hot steamed bread.