The meaning depends on what the article was and whether or not the plastic factor created an element of disappointment in your dream.
Plastic, as such, predicts a friendship which will, surprisingly, turn out to be useful as well as enjoyable.
[1]Plastic appeanng in a dream may point to amficiali- ty or a plastic persona. It may comment that you are not being natural or are not living an authentic life.
A plastic shopping bag may comment on impulse-buying behavior.
[2]Dreams of plastic signify that something or someone in your life is fake or pretending to be someone other than who they say they are. Alternatively, plastic also represents durability and resilience.
[3]To see plastic objects in your dream, suggests that you are being fake and artificial. You are not being genuine and true to yourself.
[4]1. Level of function, helpfulness and pliability.
2. Authenticity, how “real” something is, often a personality aspect.
[5]Figurative of that which is created by man instead of god
[6]Artificial; flexible, adaptable, insensitive.
[7]A symbol of something flexible or pliable
[8]1. Fake;
2. Cheap; Matt. 15:8-9
[9]