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 Polyethylene is <a href="http://www.wisegeek.com/what-is-buoyancy.htm">buoyant</a>, making it popular for nautical uses. Most types of polyethylene are non-abrasive; serve as a thermal insulator; are inert to water, grease and solvents at typical temperatures; are CFC-free and <a href="http://www.wisegeek.com/what-is-ozone.htm">ozone</a> friendly, recyclable, odorless, and very lightweight. Many types of polyethylene are approved for use in the food industry. Polypropylene is not as sturdy as polyethylene, but it has benefits that make it the better choice in some situations. One of these situations is creating hinges from a plastic, such as a plastic lid on a travel mug. Over time, plastics fatigue from the repetitive stress of being opened and shut, and eventually will break. Polypropylene is very resistant to this sort of stress, and is the plastic most often used for lids and caps which require a hinging mechanism. Interesting site for plastics info-http://www.wisegeek.com/what-is-polypropylene.htm
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