Sorry for the confusion.
Essentially there are 4 types of paper RP, RB, SP, and ST. The recycled versions of each of those types are coming up in the future.
For SPN you have to consider Corona treatment if you want to have them printable. If you just want to use them as a replacement layer for OPP material application, then you don't need this type of treatment.
SP products are delivered in roll format and you can find a variety of applications to be made as plastic alternative material.