The high temperature and high pressure plastic bottle can be sterilized by high temperature steam, and the bottle body will not deform at 121 degrees for 30 minutes. For biological product manufacturers that are sterilized by high temperature steam, high-permeability polypropylene is selected as the material for high-temperature and high-pressure plastic bottles.  

Polypropylene is a thermoplastic resin obtained by polymerizing propylene. According to the arrangement of methyl groups, it is divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. If the methyl groups are arranged on the same side of the molecular main chain, it is called isotactic polypropylene. If the methyl groups are arranged in disorder on both sides of the molecular main chain, it is called atactic polypropylene. When the methyl groups are arranged alternately on both sides of the molecular main chain, it is called syndiotactic polypropylene. Polypropylene. In general industrial polypropylene resins, the isotactic structure content is about 95%, and the rest is random or syndiotactic polypropylene. Industrial products are mainly composed of isotactic substances. Polypropylene also includes copolymers of propylene with small amounts of ethylene. Usually a translucent colorless solid. The relative density is small, only 0.89-0.91, which is one of the lightest varieties of plastics.