Question

plastic is a metal or non metal

Answer 1

It is a non metal 
Also,it is a non metal since it does not contain the following characters which a metal should posses:
1. Lustorous i.e, shining
2.Sonorous
3.Good conductor of heat and electricity etc..
Hope it helps!
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Answer 2

Generally the term metal and non metal is use for elements. Although plastic is not an element but it is a mixture of various non metals such as carbon , hydrogen , oxygen etc .