In life, the most frequently contacted plastic products are PP, PE and PVC. PP, PE and PVC are the abbreviation of English name. The Chinese names are polypropylene, polyethylene, and polyvinyl chloride.
Some of the old-fashioned slippers we use are made of PVC. They are very soft in summer and soft in winter. This has a lot to do with the temperature sensitivity of PVC. PVC will decompose toxic gas chlorine at high temperatures. Among the three, PVC has the highest density.
Ordinary plastic bags are made of PE. Its toughness is better. PE is also divided into HDPE (high density polyethylene) and LDPE (low density polyethylene). The density is different, which causes some of its properties to be very large. difference.
PP is a relatively safe plastic in plastics. The general food packaging bag is made of it. Of course, PP also has a grade, and the packaged food must be food grade. PP is the least dense of the three and can float on the surface.
These polymer materials can be modified by adding some other materials to make them superior in overall performance or in some aspects for special use. Of course, the price after modification is sometimes greatly increased.
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