Other contributors have said "How are the different properties of plastic achieved?" is the same question as "What is are the physical and mechanical properties of plastic?" If you believe that these are not asking the same thing and should be answered differently, click here
What is are the physical and mechanical properties of plastic?
There are a huge number of plastics, and their properties vary widely. Listing all of them and their chemical and physical properties here is not possible. There are whole books filled with just some...
It is physical property because when you recycle, it will become recycled plastic which is the same thing but it can also be chemical property because it can mix chemically with other materials....
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