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The most widely used plastic in the world is PET, which is made out of polyethylene terephthalate.
PET is most commonly used for fibers for the food product, clothing, containers, and thermoforming for manufacturing.
PVC is polyvinyl chloride and is most often used for plumbing and drainage.
Polypropylene, or PP for short, is a thermoplastic made from the combination of propylene monomers.
If you are not sure what to choose for your product, you can read this article for more details:
http://www.hengdingpackaging.com/