In our daily life, we often contact plastic products PP, PE, PVC, PP, PE and PVC are abbreviations in english. The Chinese names are polypropylene, polyethylene and polyvinyl chloride.
Some of our usual old slippers are made of PVC. They are tough in the summer and soft in winter, which is closely related to the temperature sensitivity of PVC. PVC decomposes toxic gases chlorine at high temperatures. The density of PVC in the three is large.
Ordinary plastic bags are made of PE, and its toughness is better, PE is also divided into HDPE (HDPE) and LDPE (low-density polyethylene), the density of different, leading to some of its properties are very different.
PP is plastic more secure plastic, general food packaging bag is to use it to do, of course, PP also has grade, packaging food must be used for food grade. PP in three of the density * * small, can float on the water surface.
As these materials generally can be modified for some other materials, so that the overall performance of it or in a superior performance for special purposes, of course, the modified price sometimes greatly improved.