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Hi,You'll have 2B more specific: Ployethylene is a defined material "hard plastic" is a large group of materials...... making it very hard to answer.Best regards,
Polyethylene is also a plastic and it can be hard depending upon its density and composition. different types of polyethylene can be considered as hard plastic like High Density Polyethylene(HDPE) or Polyethylene Terephthalate (PET).
You can get more information about polyethylene and plastics at http://www.worldofplastic.net
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them