Both "bopp" and "opp" are plastic film materials, and they are actually two different names for the same material. BOPP stands for Biaxially Oriented Polypropylene, while "OPP" stands for Oriented Polypropylene. The difference between the two lies in the usage habits of the names and the regionality.

These films are made of polypropylene (a plastic material) and prepared through a specific process for superior physical properties and applicability. The biaxial stretching or orientation process gives the film a stronger molecular alignment in both directions, which increases the strength, clarity and durability of the film.

In summary, "bopp" and "opp" refer to the same type of plastic film, just using different names in different regions or contexts.