How to distinguish between the material of plastic bags wholesale plastic bags?

In the wholesale of plastic bags, customers often need to PE, PO material or OPP plastic bags, the PE, PO, OPP material how to distinguish?
Commonly used plastic bags can be divided into PE bags, PP, PO plastic bags, plastic bags, OPP plastic bags and PVC plastic bag type, the use of plastic bags is different so also need different materials of plastic bags, if it is used for packing food had better use PE and PO material, PVC material toxic cannot be used for food packaging.The several kinds of material plastic bags can be distinguish from feel the texture.
PE plastic bags: material body is soft, a slick, transparency is not high, is covered, but tension is good, not explosive.    

How to distinguish between the material of plastic bags wholesale plastic bags?

PP plastic bag: material body is hard, but the transparency is higher, more clear, the tension is not very good, and explosive.      
PO plastic bags: material and brittle, transparency is not high, than PE material, a little white, pull is not very good.    
OPP bags: material body is the most fragile, the highest transparency, tension is not enough, but the most explosive, and the easiest decoloring printing.     
PVC plastic bags: material body soft and hard, cannot be used for food packaging, can according to customer needs to order the material, transparency can also be root tree needed, because there are super transparent material, ordinary materials and grinding ShaLiao, tension is good, is not easy to rip, is not easy to break.

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