5. Polypropylene (PP) is polymerized from propylene and […]
5. Polypropylene (PP) is polymerized from propylene and has better transparency than polyethylene. It is harder than polyethylene. Most of the boxes used for packaging in restaurants are it. The plastic boxes made can be put into a microwave oven for heating.
6. Polystyrene (PS), which is made by polymerizing styrene, is often used in bowls of instant noodle boxes and fast food boxes. It is heat-resistant and cold-resistant, but the temperature is too high to release harmful substances, so do not put bowls of instant noodles in a microwave oven, and try not to use it to fill hot food, and also not contain strong acid (if juice) Strong alkaline substances, otherwise it will release styrene and auxiliary materials.
7. Polycarbonate (PC), which is synthesized by using bisphenol A and diphenyl carbonate as raw materials, has excellent impact toughness and mechanical strength, and good transparency, so it is known as "transparent metal". Commonly used in the manufacture of kettles, cups, feeding bottles, etc. In the process of making PC, the raw material bisphenol A should completely become a plastic structural component and should not be released during use, but it is often not done in practice. There will be a small part of bisphenol A that cannot be completely converted into plastic. Was released into food. 1. Polyethylene terephthalate (PET), which is composed of ethylene. Commonly used as mineral water bottles, cola drink bottles, juice bottles, etc. Because it can only heat up to 120 ℃, it is only suitable for cold and warm drinks. If it is filled with high temperature liquid or heated, it will deform.