You'll know a piece of plastic is made of polypropylene if it has the number 5 inside the recycling triangle symbol. Polypropylene is commonly used in many different applications, including ...

Polyvinyl chloride (PVC), with the recycle symbol 3, is the world’s third ... In terms of the overall recyclability of polypropylene, the U.S. is well equipped to handle #5 plastics, and PP ...