There are many materials we don't know that are widely used in our daily life. For example, PP material, some water cups / water bottles and fresh-keeping boxes are made of PP material. What is PP material? Now let's get to know.
PP material is called polypropylene, temperature resistance – 20 – 120 degrees, is one of the most common special plastics for microwave ovens.
Some of our common old-fashioned daily slippers are made of PVC. They are soft in summer and hard in winter, which is closely related to the temperature sensitivity of PVC. At high temperatures, PVC decomposes chlorine, a toxic gas. Among them, the density of PVC is the highest.
Common plastic bags for daily necessities are made of PE, which has good toughness. PE can also be divided into HDPE (high density polyethylene) and LDPE (low density polyethylene). Different densities lead to different properties of PE.
PP material is a relatively safe plastic in the plastics of daily necessities. Generally, food packaging bags are made of it. Of course, PP also has grades. Food packaging must be food-grade.
These macromolecule materials can generally be modified by adding some other materials, so that their overall performance or performance is superior in one respect, and they can be used for special purposes. Of course, the price of modified materials will sometimes be greatly increased.
General plastics can not be directly contacted with hotter food. There is no need to worry about this problem when using PP material. Qualified PP material can be used in microwave oven.
