Food-grade pp material will not dissolve harmful substances at normal temperature and high temperature, but if it is industrial pp material, it will dissolve harmful substances at normal temperature or high temperature, which is harmful to people's health. Some of them have a strong smell when used in food containers. Therefore, when food involves the use of pp material, it must be food grade. If industrial grade is used, it will do great harm to human body.
Characteristics and uses of polypropylene
Polypropylene, abbreviated as PP, is a polymer formed by addition polymerization of propylene. It is a white waxy substance with a transparent and light appearance. The chemical formula is (C3H6)n, the density is 0.89 ~ 0.9 1g/cm3, it is flammable, the melting point is 189℃, it softens at about 155℃, and the service temperature range is -30 ~ 140℃.
It can resist the corrosion of acid, alkali, salt solution and various organic solvents below 80℃, and can be decomposed under high temperature and oxidation. Polypropylene is a thermoplastic synthetic resin with excellent properties. It is a colorless and translucent thermoplastic lightweight general plastic. It has chemical resistance, heat resistance, electrical insulation, high strength mechanical properties and good wear resistance. Widely used in the production of clothing and blankets, medical equipment, automobiles, bicycles, parts, transportation pipelines, chemical containers and other fiber products. , also used in food and drug packaging.