BOPP is a term commonly used in roll label production BOPP stands for biaxially-oriented polypropylene. Polypropylene is a thermoplastic polymer, alternately known as polypropene. It is very popular in roll-label print production since it has an ideal printing surface. BOPP is essentially polypropylene that’s stretched flat. BOPP is oriented with a system that stretches it in two directions. This is where the “ biaxially-oriented (BO)” part of BOPP comes from. BOPP is oil and water-resistant but we only recommended it for indoor use. https://www.4over4.com/printing/roll-label-printing