http://www.packaginggraphics.net/imgages/images/recycle-resin-logos-lr_05.jpg|right Polypropylene is a common plastic that has the useful property of being resistant to [[Acetone]], which dissolves many plastics. Most plastic containers have a recycling symbol with a single digit inside and letters below. A recycling symbol with the number 5 and the letters PP below, identify a polypropylene container.