How to distinguish PET plastic bottles from PVC plastic bottles

There is almost no difference in appearance and hand feel between PET plastic bottles and PVC plastic bottles. Is there a simple method for material identification? 

PET is a degradable plastic. Under the advocacy of environmental protection from all walks of life, the usage is increasing. The use of food packaging bottles almost completely replaces PVC bottles. In the past, many mineral water bottles and so on were made of PVC materials. Now, almost all the plastic bottles for drinking water and beverages are made of PET. 

How do ordinary people distinguish PET plastic bottles from PVC plastic bottles without special physical or chemical tests? 

Check the logo at the bottom of the bottle

General plastic bottles need to be engraved with the mark of raw materials on the bottom of the bottle. The bottom of the PET bottle will have the word "PET", and the PVC bottle will be printed with the word "PVC" accordingly. This is the simplest and most intuitive method.

View manufacturing process 

What if some bottles are not marked with raw materials? This is the case. Or will PVC pretend to be PET? After all, PET is much more expensive than PVC. In fact, some differences can be seen from some details on the bottle. It takes two steps to make a PET bottle. First, the bottle blank is injection molded into a bottle blank, and then the bottle blank is blow molded, so there will be a filling port in the center of the bottom of the PET bottle. PVC is a production, do not need injection molding to make the bottle blank, direct blow molding bottle bottom is no injection molding mouth. This feature can be seen at a glance.

Secondly, look at the mold marks of the bottle body. In the manufacturing process of PVC bottles, the melted raw materials are directly molded and cooled in the mold, and an obvious edge is easily formed at the gap of the mold. PET bottle is heated and softened bottle blank is put into the mold to blow the bottle. The edge line of the mold is relatively not obvious. If you touch it with your hand, the edge line is much rounder.

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